Network security architecture is the planning and design of the campus network to reduce
security risks in accordance with the institution’s risk analysis and security policies. It focuses on
reduc-ing security risks and enforcing policy through the design and con-figuration of firewalls,
routers, and other network equipment.
Network security is important because it is one of the means to enforce the policies and
procedures developed by the institution to protect information. It is often referred to as the “front
door” in broader discussions of IT security. To the extent that you can block network access to a
computer, you “lock” the door and provide bet-ter protection for that computer and its contents.
Traditional network design has focused on creating a secure net-work perimeter around the
organization and strategically placing a firewall at the point where the network is connected to
the Inter-net. For higher education, this traditional design is problematic; our constituents need
access from off campus to a large number of machines and services on campus. In addition,
because we have many computers on our campus that we cannot implicitly trust, we also must be
concerned about security threats from inside the perimeter protected by a traditional firewall.
These design issues require a different approach to network security. Although it is impossible to
do justice to the topic of network design in a few pages, there are some best practices that I feel
universities should focus on in terms of network design.
Step 1: Eliminate Network Components That Still UseShared Ethernet
Shared Ethernet switches (or hubs) were developed more than a decade ago to interconnect
multiple computers and networks. These hubs retransmit all network traffic to all computers
connected to that hub. The security implication is that if one computer has its security
compromised it can be used to monitor network traffic com-ing from any other computer that
shares the same hub. This could expose passwords and other sensitive information. Today,
switched Ethernet, which isolates traffic intended for one computer from the view of others on
the same switch, is very inexpensive and, hence, it is worth the cost of replacing older hubs.
Step 2: Embrace and Implement the Concept of Defense and Use Multiple Firewalls Within
Your Network
Commercial and Linux-based firewalls are inexpensive enough that you can deploy these in
multiple locations as needed. It is still bene-ficial to have a firewall separating your institutional
network from the connection to the Internet. This firewall, called a border firewall, will provide a
minimal level of protection for all computers on your net-work. The major benefit of this firewall
is that it allows your network and security staff to quickly block external access should a threat
arise, such as when the “SQL worm” was launched in January 2003 In addition to the border
firewall, consider adding internal firewalls to protect areas that requi.
This document discusses the design and implementation of a network security model using routers and firewalls. It begins by outlining the importance of network security and some common vulnerabilities, threats, and attacks against network devices like routers. It then provides details on specific attacks like session hijacking, spoofing, and denial of service attacks. The document also discusses best practices for router and firewall security policies, including access control, authentication, and traffic filtering. The overall aim is to protect networks from vulnerabilities and security weaknesses by implementing preventative measures, securing devices like routers and firewalls, and establishing proper security policies.
Network security refers to the set of rules, technologies, and processes used to protect computer networks. It aims to preserve the confidentiality, integrity, and availability of network data and resources. Network security works through physical, technical, and administrative controls. Physical controls restrict access to network infrastructure. Technical controls protect data in transit and storage through measures like antivirus software, firewalls, and virtual private networks. Administrative controls govern user authentication, access levels, and system changes through security policies. Together these layers safeguard networks from both internal and external cyber threats.
The Ultimate Guide to Network Firewalls_ Everything You Need to Know.pdf
Network firewalls provide multiple layers of security, significantly enhancing your network’s ability to resist cyber threats. They offer comprehensive protection against a wide range of attacks, from simple malware to complex, multi-vector threats.
This document discusses firewalls, including their definition, history, types, and purposes. A firewall is a program or hardware device that filters network traffic between the internet and an internal network based on a set of security rules. There are different types of firewalls, including packet filtering routers, application-level gateways, and circuit-level gateways. Firewalls aim to restrict network access and protect internal systems by only allowing authorized traffic according to a security policy.
The document discusses security measures taken by the ICT directorate of Addis Ababa Science and Technology University. They use a FortiGate 1200D firewall to secure their internal network and servers from threats. They also use Kaspersky antivirus software, implement backup and fault tolerance systems, and take steps to secure their web, database, and mail servers. The staff follow security checklists that include keeping systems updated, implementing firewalls and SSL, encrypting connections, securing user logins and databases, and scanning for malware.
Lakshmi.S presents information on firewalls including definitions, types, and concepts. A firewall filters internet access to protect private networks. There are software and hardware firewalls. Types include packet filtering routers, application-level gateways, and circuit-level gateways. Firewalls concentrate security, filter unnecessary protocols, hide internal information, and require connections through the firewall. While firewalls improve security, they can hamper some network access and concentrating security in one location means compromising the firewall poses risks.
This document discusses the design and implementation of a network security model using routers and firewalls. It begins by outlining the importance of network security and some common vulnerabilities, threats, and attacks against network devices like routers. It then provides details on specific attacks like session hijacking, spoofing, and denial of service attacks. The document also discusses best practices for router and firewall security policies, including access control, authentication, and traffic filtering. The overall aim is to protect networks from vulnerabilities and security weaknesses by implementing preventative measures, securing devices like routers and firewalls, and establishing proper security policies.
Network security refers to the set of rules, technologies, and processes used to protect computer networks. It aims to preserve the confidentiality, integrity, and availability of network data and resources. Network security works through physical, technical, and administrative controls. Physical controls restrict access to network infrastructure. Technical controls protect data in transit and storage through measures like antivirus software, firewalls, and virtual private networks. Administrative controls govern user authentication, access levels, and system changes through security policies. Together these layers safeguard networks from both internal and external cyber threats.
The Ultimate Guide to Network Firewalls_ Everything You Need to Know.pdfCyberPro Magazine
Network firewalls provide multiple layers of security, significantly enhancing your network’s ability to resist cyber threats. They offer comprehensive protection against a wide range of attacks, from simple malware to complex, multi-vector threats.
Network security is a dynamic art, with dangers appearing as fast as black hats can exploit vulnerabilities. While there are basic “golden rules” which can make life difficult for the bad guys, it remains a challenge to keep networks secure. John Chambers, Executive Chairman of Cisco, famously said “there are two types of companies: those that have been hacked, and those who don’t know they have been hacked”. The question for most organizations isn’t if they’re going to be breached, but how quickly they can isolate and mitigate the threat. In this paper, we’ll examine best practices for effective cybersecurity – from both a proactive (access hardening) and reactive (threat isolation and mitigation) perspective. We’ll address how network automation can help minimize cyberattacks by closing vulnerability gaps and how it can improve incident response times in the event of a cyberthreat. Finally, we’ll lay a vision for continuous network security, to explore how machine-to-machine automation may deliver an auto-securing and self-healing network.
Go to www.esgjrconsultinginc.com
Toward Continuous Cybersecurity With Network AutomationKen Flott
Network security is a dynamic art, with dangers appearing as
fast as black hats can exploit vulnerabilities. While there are
basic “golden rules” which can make life difficult for the bad
guys, it remains a challenge to keep networks secure. John
Chambers, Executive Chairman of Cisco, famously said “there
are two types of companies: those that have been hacked, and
those who don’t know they have been hacked”. The question
for most organizations isn’t if they’re going to be breached, but
how quickly they can isolate and mitigate the threat.
In this paper, we’ll examine best practices for effective
cybersecurity – from both a proactive (access hardening)
and reactive (threat isolation and mitigation) perspective.
We’ll address how network automation can help minimize
cyberattacks by closing vulnerability gaps and how it can
improve incident response times in the event of a cyberthreat.
Finally, we’ll lay a vision for continuous network security, to
explore how machine-to-machine automation may deliver an
auto-securing and self-healing network.
Industry Best Practice against DDoS AttacksMarcelo Silva
The university network was compromised after password sniffers captured an administrator's password, allowing bots to be installed on internal hosts from which a DDoS attack originated. To protect the network using industry best practices, the university should: 1) implement patch management to fix vulnerabilities, 2) deploy internal firewalls and IDS to segment networks and filter traffic, and 3) install antivirus software on all workstations and improve security policies.
Cloud technology to ensure the protection of fundamental methods and use of i...SubmissionResearchpa
A comparative analysis of attacks carried out in cloud technologies, the main methods and methods of information protection, the possibilities of using hardware and software, and methods to combat threats when eliminating them, ensuring data protection were carried out by Mamarajabov Odil Elmurzayevich 2020. Cloud technology to ensure the protection of fundamental methods and use of information. International Journal on Integrated Education. 3, 10 (Oct. 2020), 313-315. DOI:https://doi.org/10.31149/ijie.v3i10.780 https://journals.researchparks.org/index.php/IJIE/article/view/780/750 https://journals.researchparks.org/index.php/IJIE/article/view/780
Firewall is a device or set of instruments designed to permit or deny network transmissions based upon a set of rules and regulation is frequently used to protect networks from unauthorized access while permitting legitimate communications to pass or during the sensitive data transmission. Distributed firewalls allow enforcement of security policies on a network without restricting its topology on an inside or outside point of view. Use of a policy language and centralized delegating its semantics to all members of the networks domain support application of firewall technology for organizations, which network devices communicate over insecure channels and still allow a logical separation of hosts in- and outside the trusted domain. We introduce the general concepts of such distributed firewalls, its requirements and implications and introduce its suitability to common threats on the Internet, as well as give a short discussion on contemporary implementations.
Network security involves implementing multiple layers of defenses to protect a network from threats. It includes technologies like firewalls, antivirus software, and intrusion detection systems to manage access and detect malware and exploits. As networks increasingly face hacking threats, strong network security tools are essential for organizations to protect their systems, data, and reputation. Network security strategies aim to authorize only legitimate users while blocking malicious actors from harming the network.
Application Of An Operating System SecurityAmber Wheeler
The document discusses the Flask operating system architecture prototype created by the NSA and University of Utah researchers to address the need for flexibility in controlling access rights policies. The Flask prototype was found to be practical and flexible to operate, with the ability to cleanly separate security policy logic from enforcement mechanisms. It was shown to meet the needs of a system requiring policy flexibility through a security policy server capable of making access determinations and revoking prior access rights.
Internet security involves protecting systems and data from unauthorized access. Common security threats include hacking, viruses, phishing, and denial of service attacks. It is important for users to implement security measures like firewalls and keep software updated to prevent intrusions and thefts of personal information.
Internet security involves protecting systems and data from unauthorized access. Common security threats include hacking, viruses, phishing, and denial of service attacks. It is important for users to implement security measures like firewalls and keep software updated to prevent intrusions and thefts of personal information.
How To Learn The Network Security
Slide berikut merupakan slide yang berisikan dasar-dasar bagi kita dalam memahami konsep keamanan jaringan komputer, baik dari sisi inftrastruktur, teknologi dan paradigma bagi pengguna.
Materi yang diberikan sudah disusun oleh Pakar yang merupakan Trainer CEH dan memang berkompeten dibidang keamanan jaringan.
Slide ini saya dapatkan dari beliau saat mengikut training Certified Computer Security Officer (CCSO) dan Certified Computer Security Analyst (CCSA) dari beliau.
Semoga bermanfaat sebagai acuan bagi kita untuk belajar tentang keamanan jaringan komputer.
Terimakasih
1) Network security has become more important with the rise of the internet and interconnected networks. As personal and business information is transmitted over networks, security threats have also increased.
2) The document discusses the history and importance of network security. It covers how the architecture of the internet led to vulnerabilities, and how understanding attack methods has helped develop appropriate security technologies.
3) The future of network security is still evolving as new trends emerge. A layered security approach corresponding to the OSI model layers is being explored as an effective way to design secure networks.
This document provides an overview of firewalls, including what they are, how they work, types of firewalls, and their history. A firewall is a program or device that filters network traffic between the internet and an internal network based on a set of rules. There are different types, including packet filtering routers, application-level gateways, and circuit-level gateways. Firewalls aim to only allow authorized traffic according to a security policy while protecting internal systems. They provide advantages such as restricting access and hiding internal network information but can also limit some network connectivity.
This document discusses several topics related to cyber security including:
1. Windows security features such as User Account Control, BitLocker Drive Encryption, and Windows Firewall.
2. Network security challenges such as verifying user identity, protecting against DDoS attacks, and securing web applications.
3. Limitations of today's security solutions and how the modern workplace has increased risks from factors like telecommuting and use of mobile devices.
4. Types of internet security protocols and cryptography techniques as well as common forms of malicious software like viruses, worms, and trojan horses.
Similar to Network security architecture is the planning and design of the camp.pdf (20)
Answer Every investor expects dividend from his investments.Dividen.pdfaquazac
Answer: Every investor expects dividend from his investments.Dividend income helps investors
in dealing with their routine expenses. Investors put their money to earn some positive returns
and dividend is one of the way of getting returns for investors. So, It is a duty of management to
satisfy dividend expectation of investors.
If management do not pay dividend then it is known as retention of earnings. Retention earnings
has it\'s own pro and cons, which are described as follows:
Pros:
Retained earnings reduces organization\'s dependence on external borrowings. It can be
considered as an advantage when external borrowings are not available easily.
Retained earnings indicates good business opportunities, It means organization is growing
financially. It may result in better stock valuation of organization.
In some situation dividend is subject to taxes (either distribution tax or income tax) in the hands
of investors. So, in this case investors are not interested in dividend but they are more interested
in capital gain(which may be tax exempt). So, In this situation retained earnings fulfill investor\'s
objective.
Cons:
As explained earlier all the investors have some expectation of dividend, in case of higher
retention of earnings it may become difficult to fulfill investor\'s expectations.
Retention of earnings may affect investor\'s earning capacity when investors have available
opportunities, which gives higher return than organization earns by retaining amount. In this case
investor looses earning opportunities.
In case of dividend management\'s decision is significantly influenced by media and institutional
investors. Media is responsible for organization\'s image in society, such image significantly
affects organization\'s financial performance. This is why management always considers media\'s
point of view before making any dividend decision.
Institutional investors are usually invests their money and takes part in decision making process
of organization. Institutional investor\'s weight in decision making process is generally very
high, so it is obvious that they influence management\'s dividend decision also.
Solution
Answer: Every investor expects dividend from his investments.Dividend income helps investors
in dealing with their routine expenses. Investors put their money to earn some positive returns
and dividend is one of the way of getting returns for investors. So, It is a duty of management to
satisfy dividend expectation of investors.
If management do not pay dividend then it is known as retention of earnings. Retention earnings
has it\'s own pro and cons, which are described as follows:
Pros:
Retained earnings reduces organization\'s dependence on external borrowings. It can be
considered as an advantage when external borrowings are not available easily.
Retained earnings indicates good business opportunities, It means organization is growing
financially. It may result in better stock valuation of organization.
In some situ.
Ans. Gene is defined as the segment of DNA that gives a functional p.pdfaquazac
Ans. Gene is defined as the segment of DNA that gives a functional product (protein, RNA). A
functional product can be either protein (or polypeptide) or RNA.
mRNA transcribes from a gene is further translated to produce polypeptides. However, all other
RNAs are also transcribed from their respective genes. It includes tRNA, rRNA, snRNA and
various regulatory RNAs (micro RNA, small interfering RNA), etc. tRNA acts as amino-acid
carrier during translation. rRNA is the structural and functional scaffold of ribosomes. snRNA
mediates splicing of immature mRNA. miRNA and siRNA have crucial roles in gene
regulations.
SO, polypeptides are just one class of functional product from DNA. The genomic DNA also
produces various classes of RNAs with diverse functions that are crucial for cellular activates
and gene regulation.
Therefore, the statement “Add DNA sequences in the genome that does not encode polypeptides
can be defined as junk DNA” is INCORRECT. Junk DNA is non-coding DNA that excludes all
genes (including those encoding polypeptides and RNAs).
Solution
Ans. Gene is defined as the segment of DNA that gives a functional product (protein, RNA). A
functional product can be either protein (or polypeptide) or RNA.
mRNA transcribes from a gene is further translated to produce polypeptides. However, all other
RNAs are also transcribed from their respective genes. It includes tRNA, rRNA, snRNA and
various regulatory RNAs (micro RNA, small interfering RNA), etc. tRNA acts as amino-acid
carrier during translation. rRNA is the structural and functional scaffold of ribosomes. snRNA
mediates splicing of immature mRNA. miRNA and siRNA have crucial roles in gene
regulations.
SO, polypeptides are just one class of functional product from DNA. The genomic DNA also
produces various classes of RNAs with diverse functions that are crucial for cellular activates
and gene regulation.
Therefore, the statement “Add DNA sequences in the genome that does not encode polypeptides
can be defined as junk DNA” is INCORRECT. Junk DNA is non-coding DNA that excludes all
genes (including those encoding polypeptides and RNAs)..
additional optmization techniques for underlying IP network must1.pdfaquazac
additional optmization techniques for underlying IP network must:
1.Have bandwidth and performance to handle converged services.
2.Seprate VLAN for Voice traffic.
3.Meet the demand of high availability of voice services by providing resiliency to mitigate the
effect of network outages.
4.Should be modular, hierarchical & consistent to promote consistency and manageability.
5.configure QoS on core switch.
Solution
additional optmization techniques for underlying IP network must:
1.Have bandwidth and performance to handle converged services.
2.Seprate VLAN for Voice traffic.
3.Meet the demand of high availability of voice services by providing resiliency to mitigate the
effect of network outages.
4.Should be modular, hierarchical & consistent to promote consistency and manageability.
5.configure QoS on core switch..
According to the given equation, aqueous carbon dioxide reacts with .pdfaquazac
According to the given equation, aqueous carbon dioxide reacts with water to form carbonic
acid, Carbonic acid is not stable in normal body temperatures, therefore, it ionizes into
bicarbonate ion (HCO3-) and a hydrogen ion (H+) is liberated. The liberation of hydrogen ions
decreases the pH.
During breathing, oxygen is inhaled which is carried by the blood to the different tissues of the
body. Oxygen facilitates the various metabolic reactions occurring inside our cells and helps in
respiration, or the generation of energy. Carbon dioxide, formed as a by-product of these energy-
generating metabolic reactions, diffuses out of the tissues and into the blood stream, which
carries CO2 to the lungs, where it is exhaled out.
a) In case of hypoventilation :
The exchange of gases that occurs in the lungs while breathing is impaired. Therefore, the
requisite amount of carbon dioxide is not being exhaled out. This leads to a build-up of carbon-
dioxide in the blood plasma. As a result, the forward reaction is facilitated and more H+ ions are
generated. The higher concentration of H+ ions decreases the pH (acidic pH). This can lead to
acidosis.
The build-up of carbon dioxide in the blood facilitates the forward reaction and therefore the
equilibrium shifts to the right.
The hydronium ion or H3O+ is the product of a hydrogen ion (H+) and water. Since a hydrogen
ion is too small to exist freely in water, it therefore combines with a water molecule to form a
hydronium ion which is more stable. In case of hypoventilation, the concentration of H+ ions
increase. Therefore, the concentration of hydronium ions increase during hypoventilation.
The stress concentration or partial pressure of CO2 during hypoventilation is significantly higher
than 40mmHg (around 60-65 mmHg).
b) In case of hyperventilation :
The breathing rate is more than normal. Therefore, as a result of heavier and faster breathing, the
CO2 concentration in the blood rapidly decreases, that is, CO2 easily leaves the blood plasma.
Decrease in the CO2 concentration slows down the rate of the forward reaction, reducing the
levels at which bicarbonate ion and H+ ion concentration were being generated. The bicarbonate
and hydrogen ions recombine to yield CO2 and water. This lowering in hydrogen ion
concentration consequently lowers the pH (alkaline pH). This can lead to alkalosis.
As a result of the lowering of CO2 , the reverse reaction takes place. The carbonic acid changes
back to CO2 and H2O, shifting the equilibrium to the left.
The concentration of H3O+ decreases during hyperventilation, since the H+ ion concentration is
lowered.
The stress levels or partial pressure of CO2 during hyperventilation is significantly lower than 40
mmHg (around 25-30 mmHg).
c) If sodium carbonate or Na2CO3 is added instead of sodium bicarbonate, then sodium
carbonate would react with water and it would hydrolyse into Na+ and CO32- ions. The CO32-
combine with the hydrogen (H) present in water to form H2CO3 (carbon.
a) mean = 1.43Thus distribution is Poisson(4.2)P(X = 4) = 4.2^4.pdfaquazac
a) mean = 1.4*3
Thus distribution is Poisson(4.2)
P(X = 4) = 4.2^4 * e^{-4.2} / 4! = 0.1944
b)
average number of ghosts in 90min (1.5hrs) interval = 1.4*1.5 = 2.1
c)
Probability that 4th ghost will appear before 10 am
= Probability that number of ghosts appearing from 8 to 10 am >= 4
As it is a 2 hr period, the distribution of number of ghosts is Poisson(1.4*2) i.e Poisson(2.8)
P(X >= 4)
= 1 - P(X < 4)
= 1 - [P(X=0) + P(X=1) + P(X=2) + P(X=3)]
= 1 - [(2.8^0 * e^{-2.8} / 0!) + (2.8^1 * e^{-2.8} / 1!) + (2.8^2 * e^{-2.8} / 2!) + (2.8^3 * e^{-
2.8} / 3!)]
= 1 - [0.0608 + 0.1703 + 0.2384 + 0.2225]
= 0.692
d)
When arrival distribution is Poisson(lambda), inter-arrival time distribution is
Exponential(lambda)
Thus, interarrival time distribution is Exponential(1.4)
Expected value of time between 5th and 6th ghost = 1/1.4 = 0.7143hr
e)
On average time taken for 10th ghost to arrive = 10*(1/1.4) = 7.143hr
Thus on an average, 10th ghost will arrive at 3:09pm
f)
Expected value of time between ghost appearances = 1/1.4 = 0.7143hr (see part d)
g)
Probability that 3rd ghost appears after 9:45 am
= Probablity that number of ghosts appearing till 9:45 am < 3
Duration from 8am to 9:45 am = 1.75hr
Mean number of ghosts = 1.4*1.75 = 2.45
Thus X is Poisson(2.45)
P(X < 3)
= P(X = 0) + P(X = 1) + P(X = 2)
= (2.45^0 * e^{-2.45} / 0!) + (2.45^1 * e^{-2.45} / 1!) + (2.45^2 * e^{-2.45} / 2!)
= 0.0863 + 0.2114 + 0.2590
= 0.5567
h)
As inter-arrival time is Exponential(1.4), inter-arrival time is memoryless
Thus, time for 7th ghost will be calculated from 1:00 pm and not from 12:35pm due to
memorylessness property.
Time duration from 1:00pm to 1:15pm = 0.25hrs
Let Y be random variable denoting inter-arrival time
probability that the 7th ghost will appear before 1:15 p.m.
= P(Y < 0.25)
= 1 - e^{-1.4 * 0.25)
= 0.2953
i)
Expected value of time for 7th ghost to appear after 1:00pm = 1/1.4 = 0.7143hr = 42.86 min
Time from 12:35pm to 1:00pm = 25min
Thus expected interarrival time = 25 + 42.86 = 67.86 min = 1hr 7.86min
j)
Expected duration after 1:00pm for 9th ghost to appear = 3 * (1/1.4) = 2.143hr = 2hr 8.58min
Thus expected time at which 9th ghost appears = 3:09pm
k)
As the inter-arrival time follows memorylessness property, the future probabilities do not change
with the observed value at past.
Thus, 4 ghosts appearing between 7:00pm to 10:00pm does not affect ghost appearance from
11:00pm to 11:30pm
Duration from 11:00pm to 11:30pm = 0.5hrs
mean number of ghosts = 1.4*0.5 = 0.7
Thus it follows Poisson(0.7) distribution
P(X > 2)
= 1 - P(X <= 2)
= 1 - [P(X = 0) + P(X = 1) + P(X = 2)]
= 1 - [(0.7^0 * e^{-0.7} / 0!) + (0.7^1 * e^{-0.7} / 1!) + (0.7^2 * e^{-0.7} / 2!)]
= 1 - [0.4966 + 0.3476 + 0.1217]
= 0.0341
l)
Probability that 8 ghosts appear between 6pm and midnight
= Probability that number of ghosts appear from 6pm to 7pm and 10pm to midnight = 4 as it is
known that 4 ghosts appeared from 7pm to 10pm
Let A denote number of ghost from 6pm to 7pm
B denote number of ghosts .
2.a. Wired Media Type and ExplinationTwisted-Pair CableTwiste.pdfaquazac
2.
a. Wired Media Type and Explination:
Twisted-Pair Cable
Twisted-pair cable is a type of cabling that is used for telephone communications and most
modern Ethernet networks. A pair of wires forms a circuit that can transmit data. The pairs are
twisted to provide protection against crosstalk, the noise generated by adjacent pairs. When
electrical current flows through a wire, it creates a small, circular magnetic field around the wire.
When two wires in an electrical circuit are placed close together, their magnetic fields are the
exact opposite of each other. Thus, the two magnetic fields cancel each other out. They also
cancel out any outside magnetic fields. Twisting the wires can enhance this cancellation effect.
Using cancellation together with twisting the wires, cable designers can effectively provide self-
shielding for wire pairs within the network media.
Two basic types of twisted-pair cable exist: unshielded twisted pair (UTP) and shielded twisted
pair (STP). The following sections discuss UTP and STP cable in more detail.
UTP Cable
UTP cable is a medium that is composed of pairs of wires . UTP cable is used in a variety of
networks. Each of the eight individual copper wires in UTP cable \\is covered by an insulating
material. In addition, the wires in each pair are twisted around each other.
UTP cable relies solely on the cancellation effect produced by the twisted wire pairs to limit
signal degradation caused by electromagnetic interference (EMI) and radio frequency
interference (RFI). To further reduce crosstalk between the pairs in UTP cable, the number of
twists in the wire pairs varies. UTP cable must follow precise specifications governing how
many twists or braids are permitted per meter (3.28 feet) of cable.
UTP cable often is installed using a Registered Jack 45 (RJ-45) connector The RJ-45 is an eight-
wire connector used commonly to connect computers onto a local-area network (LAN),
especially Ethernets.
When used as a networking medium, UTP cable has four pairs of either 22- or 24-gauge copper
wire. UTP used as a networking medium has an impedance of 100 ohms; this differentiates it
from other types of twisted-pair wiring such as that used for telephone wiring, which has
impedance of 600 ohms.
UTP cable offers many advantages. Because UTP has an external diameter of approximately
0.43 cm (0.17 inches), its small size can be advantageous during installation. Because it has such
a small external diameter, UTP does not fill up wiring ducts as rapidly as other types of cable.
This can be an extremely important factor to consider, particularly when installing a network in
an older building. UTP cable is easy to install and is less expensive than other types of
networking media. In fact, UTP costs less per meter than any other type of LAN cabling. And
because UTP can be used with most of the major networking architectures, it continues to grow
in popularity.
Disadvantages also are involved in using twisted-pair cabling, howe.
A person may not choose to participate in the labour force due to La.pdfaquazac
A person may not choose to participate in the labour force due to Laziness, lack of ambition,
emotional or chemical imbalance, independent wealth, personal unavailability, or other priorities.
However, race, location, education, and marital status are irrelevant at times. They do affect the
type of job, or their availability, but not the individual\'s desire to have one. Choosing to stay
home and raise children is an example of different priorities, and a spouse\'s income, if they are
wealthy enough, may negate having to even make a choice.
(a) with low education, a job might not pay much more than unemployment benefit.
(b) with children, there is strong incentive to stay at home and take care of them.
(c) with one spouse earning a lot, another spouse can stay at home.
(d) if person belongs to a race with bad reputation, they are less likely to get hired. But at times
women are viewed as better workers than men from same race.
(e) in rural areas, there are fewer jobs, and the commute to them is longer and therefore they
prefer to do some small work nearby or choose not to work at all.
Solution
A person may not choose to participate in the labour force due to Laziness, lack of ambition,
emotional or chemical imbalance, independent wealth, personal unavailability, or other priorities.
However, race, location, education, and marital status are irrelevant at times. They do affect the
type of job, or their availability, but not the individual\'s desire to have one. Choosing to stay
home and raise children is an example of different priorities, and a spouse\'s income, if they are
wealthy enough, may negate having to even make a choice.
(a) with low education, a job might not pay much more than unemployment benefit.
(b) with children, there is strong incentive to stay at home and take care of them.
(c) with one spouse earning a lot, another spouse can stay at home.
(d) if person belongs to a race with bad reputation, they are less likely to get hired. But at times
women are viewed as better workers than men from same race.
(e) in rural areas, there are fewer jobs, and the commute to them is longer and therefore they
prefer to do some small work nearby or choose not to work at all..
Well.. 1) Ionic bonds are almost always metal to .pdfaquazac
Well.. 1) Ionic bonds are almost always metal to non-metal. (opposing charges
attract). 2) Covalent, electron-sharing. \"co\"-valent. Valent referring to the valence electrons of
the element, that is, the electrons in outer most shell. Remember each element wants to reach a
more stable state. To achieve this it will share electrons with another element through covalent
bonds. 3) a covalent bond is said to be polar if one of the elements sharing the electrons has a
greater electronegativity. (i.e. water contains polar covalent bonds between the oxygen and the
hydrogens because oxygen is far more electronegative than hydrogen, therefore it \"hogs\" the
electrons. 4) non-polar covalent bonds have an equal sharing of the electrons, equal
electronegativity. Hope this helps!
Solution
Well.. 1) Ionic bonds are almost always metal to non-metal. (opposing charges
attract). 2) Covalent, electron-sharing. \"co\"-valent. Valent referring to the valence electrons of
the element, that is, the electrons in outer most shell. Remember each element wants to reach a
more stable state. To achieve this it will share electrons with another element through covalent
bonds. 3) a covalent bond is said to be polar if one of the elements sharing the electrons has a
greater electronegativity. (i.e. water contains polar covalent bonds between the oxygen and the
hydrogens because oxygen is far more electronegative than hydrogen, therefore it \"hogs\" the
electrons. 4) non-polar covalent bonds have an equal sharing of the electrons, equal
electronegativity. Hope this helps!.
1. The answer is d) Environmental EffectsEnvironmental effects ca.pdfaquazac
1. The answer is: d) Environmental Effects
Environmental effects can cause a single genotype to produce a range of potential Phenotypes.
2. The answer is: c) Differ in both mean and variance
The Figure represents two distributions that differ in both mean and variance.
Solution
1. The answer is: d) Environmental Effects
Environmental effects can cause a single genotype to produce a range of potential Phenotypes.
2. The answer is: c) Differ in both mean and variance
The Figure represents two distributions that differ in both mean and variance..
clear clc close all Use polyfit to solve for the phase l.pdfaquazac
clear
clc
close all
%Use polyfit to solve for the phase lines
point11=[0,15];
point12=[0,300];
line1=polyfit(point11,point12,1);
m1=line1(1);
b1=line1(2);
xpf1=linspace(min(point11),max(point11),100);
ypf1=m1*xpf1+b1;
point21=[0,15];
point22=[700,300];
line2=polyfit(point21,point22,1);
m2=line2(1);
b2=line2(2);
xpf2=linspace(min(point21),max(point21),100);
ypf2=m2*xpf2+b2;
point31=[0,50];
point32=[700,300];
line3=polyfit(point31,point32,1);
m3=line3(1);
b3=line3(2);
xpf3=linspace(min(point31),max(point31),100);
ypf3=m3*xpf3+b3;
point41=[50,100];
point42=[300,800];
line4=polyfit(point41,point42,1);
m4=line4(1);
b4=line4(2);
xpf4=linspace(min(point41),max(point41),100);
ypf4=m4*xpf4+b4;
point51=[100,85];
point52=[800,300];
line5=polyfit(point51,point52,1);
m5=line5(1);
b5=line5(2);
xpf5=linspace(min(point51),max(point51),100);
ypf5=m5*xpf5+b5;
point61=[85,100];
point62=[300,0];
line6=polyfit(point61,point62,1);
m6=line6(1);
b6=line6(2);
xpf6=linspace(min(point61),max(point61),100);
ypf6=m6*xpf6+b6;
point71=[15,85];
point72=[300,300];
%Allow the user to set the percent of B
b=input(\'Enter the mass percent of B: \');
%Return an error if the percent of B is not a valid number
if b<0 || b>100
error(\'Please enter a value between 0 and 100.\')
end
%Allow the user to set the temperature
t=input(\'Enter the temperature [deg C]: \');
%Solve for percent composition of A
a=100-b;
%Determine phase based on temperature and percent composition of B using
%the phase lines
if t<300
if b<15 && t>m1*b+b1
phase=\'alpha\';
elseif b<15 && t=15 && b<=85
phase=\'alpha + beta\';
elseif b>85 && t>m6*b+b6
phase=\'beta\';
else phase=\'alpha + beta\';
end
elseif b<15
if t=15 && b<=50
if t50 && b<=85
if t=15 && b<=85 && t==300
fprintf(\'The provided conditions fall on the eutectic line.\ \')
end
if b==50 && t==300
fprintf(\'The provided conditions fall on the eutectic point.\ \')
end
%Output a formatted statement to display the phase
fprintf(\'For the composition of %0.2f%% A, %0.2f%% B and a temperature of %0.0f degrees
Celsius, the phase is %s.\ \',a,b,t,phase)
%Create a plot of the phase lines and the user\'s set point
figure(\'color\',\'white\')
%Set axes
axis([0 100 0 1000])
%Plot the phase lines, eutectic line, eutectic point, and the user\'s point
plot(xpf1,ypf1,\'-b\')
hold on
plot(xpf2,ypf2,\'-b\')
plot(xpf3,ypf3,\'-b\')
plot(xpf4,ypf4,\'-b\')
plot(xpf5,ypf5,\'-b\')
plot(xpf6,ypf6,\'-b\')
plot(point71,point72,\'-k\')
plot(b,t,\'ro\',\'MarkerFaceColor\',\'r\')
%Assign a title and axes labels
title(\'Phase Diagram of Elements A and B\')
xlabel(\'Percent Composition of B\')
ylabel(\'Temperature (T) [deg C]\')
%Set scaling for the axes
set(gca,\'XTick\',0:10:100,\'YTick\',0:100:1000)
%Place the phase names on the graph
text(40,200,\'alpha+beta\')
text(45,600,\'Liquid\')
text(90,300,\'beta\')
text(3,300,\'alpha\')
text(15,375,\'alpha + Liquid\')
text(62,375,\'beta + Liquid\')
Solution
clear
clc
close all
%Use polyfit to solve for the phase lines
point11=[0,15];
point.
The oxygen appears in both step reactions. But, i.pdfaquazac
The oxygen appears in both step reactions. But, it would not appear in the final
reaction. Therefore it is a reaction intermediate. It is sort of in the \"middle\" The final reaction
is 2O3 ====> 3 O2 (No O)
Solution
The oxygen appears in both step reactions. But, it would not appear in the final
reaction. Therefore it is a reaction intermediate. It is sort of in the \"middle\" The final reaction
is 2O3 ====> 3 O2 (No O).
PART A The element Si belongs to IVA group. Therefore, four electro.pdfaquazac
PART A: The element Si belongs to IVA group. Therefore, four electrons present in the
outermost shell. Hence the condensed electron configuration of Si is [Ne] 3s23p2. PART B: The
s orbital is completely filled and there are two electrons present in p-orbital. Therefore, the
number of unpaired electrons of Si is 2 PART C: The atomic number of Zn is 30 and it belongs
to IIB group. Therefore, the condensed electron configuration of Zn is [Ar] 4s23d10. PART D:
All orbitals of Zn completely filled with electrons. Therefore, there are no unpaired electrons.
PART E: The atomic number of Zr is 40 and it belongs to IVB group. This element is present
after third element of Kr in periodic table. Hence the condensed electron configuration of Zr is
[Kr] 5s24d2. PART F: The s orbital is completely with electrons and there are two electrons
present in the d orbital. Therefore, the number of unpaired electrons of Zr is 2 PART G: The
element Sn belongs to IVA group. Therefore, four electrons present in the outermost shell.
Hence the condensed electron configuration of Sn is [Kr] 5s24d10 5p2. PART H: The s orbital
and p orbital is completely filled. Therefore, there are two unpaired electrons in the Sn metal.
PART I: The element Ba belongs to IIA group. Therefore, two electrons present in the s-orbital.
Hence the condensed electron configuration of Ba is [Xe] 6s2. PART J: The outermost s-
electron is completely filled. Therefore, there are no unpaired electrons present in Ba metal.
PART K: The element Tl belongs to IIIA group. Therefore, the condensed electron configuration
of Tl is [Xe] 4f14 5d10 6s2 6p1. PART L: The all orbitals are filled with electrons except Tl.
Therefore, the number of unpaired electrons is 1
Solution
PART A: The element Si belongs to IVA group. Therefore, four electrons present in the
outermost shell. Hence the condensed electron configuration of Si is [Ne] 3s23p2. PART B: The
s orbital is completely filled and there are two electrons present in p-orbital. Therefore, the
number of unpaired electrons of Si is 2 PART C: The atomic number of Zn is 30 and it belongs
to IIB group. Therefore, the condensed electron configuration of Zn is [Ar] 4s23d10. PART D:
All orbitals of Zn completely filled with electrons. Therefore, there are no unpaired electrons.
PART E: The atomic number of Zr is 40 and it belongs to IVB group. This element is present
after third element of Kr in periodic table. Hence the condensed electron configuration of Zr is
[Kr] 5s24d2. PART F: The s orbital is completely with electrons and there are two electrons
present in the d orbital. Therefore, the number of unpaired electrons of Zr is 2 PART G: The
element Sn belongs to IVA group. Therefore, four electrons present in the outermost shell.
Hence the condensed electron configuration of Sn is [Kr] 5s24d10 5p2. PART H: The s orbital
and p orbital is completely filled. Therefore, there are two unpaired electrons in the Sn metal.
PART I: The element Ba belongs to IIA group. Th.
The two contributions to the cohesive energy of t.pdfaquazac
The two contributions to the cohesive energy of the ionic crystal are : Vander waals
attraction between the adjacent ions Zero point oscillations of their equilibrium position. Zero-
point energy is the lowest possible energy that a quantum mechanical physical system may have;
it is the energy of its ground state. All quantum mechanical systems undergo fluctuations even in
their ground state and have an associated zero-point energy, a consequence of their wave-like
interaction.
Solution
The two contributions to the cohesive energy of the ionic crystal are : Vander waals
attraction between the adjacent ions Zero point oscillations of their equilibrium position. Zero-
point energy is the lowest possible energy that a quantum mechanical physical system may have;
it is the energy of its ground state. All quantum mechanical systems undergo fluctuations even in
their ground state and have an associated zero-point energy, a consequence of their wave-like
interaction..
If you are talking about an extraction design, th.pdfaquazac
If you are talking about an extraction design, the the water solubility has to be
greater in the aqueous base because of the greater solubility of the salts of the acids (with few
exceptions), again presuming a differential extraction aqueous to organic.
Solution
If you are talking about an extraction design, the the water solubility has to be
greater in the aqueous base because of the greater solubility of the salts of the acids (with few
exceptions), again presuming a differential extraction aqueous to organic..
Yes ,its true. Though both gibbons and rhesus monkeys belong to pr.pdfaquazac
Yes ,it\'s true. Though both gibbons and rhesus monkeys belong to primates, but gibbons are
under a group apes, and rhesus monkeys belongs to old world monkey group. Apes are near
common ancestor of homosapiens.
Solution
Yes ,it\'s true. Though both gibbons and rhesus monkeys belong to primates, but gibbons are
under a group apes, and rhesus monkeys belongs to old world monkey group. Apes are near
common ancestor of homosapiens..
When something boils, it changes states of matter. It would go from .pdfaquazac
When something boils, it changes states of matter. It would go from a liquid to a soild when it
boils, so if more heat is added, it will just change the state of matter faster.
Solution
When something boils, it changes states of matter. It would go from a liquid to a soild when it
boils, so if more heat is added, it will just change the state of matter faster..
We need to discuss why there is an importance of adding residents to.pdfaquazac
We need to discuss why there is an importance of adding residents to the budget planning, we
can go through below explaintion and can derived various conclusions from the same.
In explaining why they did or did not seek input from citizens, respondents in- dicated that the
process was guided by the desires of the leadership. Of those who said that they did seek citizen
input, the desire (as opposed to the obligation through policy) of the staff or the govern- ing
board or staff to seek public opinion seemed to provide some motivation. Almost three-quarters
of responding cities cited staff desire, and almost two-thirds, governing board desire.
The pattern for counties was similar. The most often cited reason for extra effort to involve the
public was board interest. Almost half of the counties also cited staff interest.
Although citizen involvement is a hot topic in management literature these days, local
governments in North Caro- lina are generally not making extensive fforts to involve residents in
budgeting. Barely half of the cities responding to the survey and less than a third of the coun- ties
go beyond the single, mandated hearing to get citizen input In general, cities tend to seek input
more than counties do. This result might be explained by the different types of services offered
by the two forms of gov- ernment. Counties provide funding for, among other things, social
services, pub- lic health services, mental health ser- vices, and schools, and the boards over-
seeing these services may seek citizen input when they are preparing their own budget request
for the county.
Although there is informal interest in hearing from citizens, boards clearly want to remain
flexible in when and how they obtain input. Only 13 percent of the city respondents had a formal
pol- icy or requirement for citizen involve- ment beyond the single, state-mandated hearing.
Medium to large cities were more likely to have such requirements than small cities. Only one
county, a larger one, reported having such a policy or requirement.
Although citizen involvement is a hot topic in management literature these days, local
governments in North Caro- lina are generally not making extensive
efforts to involve residents in budgeting. Barely half of the cities responding to the survey and
less than a third of the coun- ties go beyond the single, mandated hearing to get citizen input
Of those that did not seek extra citizen involvement, the most common reason cited, on both the
city and the county level, was lack of governing board inter- est. The second most common
reason was poor response in the past, when at- tempts to get citizens involved did not seem very
effective. At the county level, lack of board interest was a far more important factor than
anything else, including poor past response: 71 percent of respondents cited lack of board
interest, whereas only 39 percent cited poor past response Although staff interest seemed to be a
big motivator for involving ci.
What is the largest decimal integer that can be represented with the.pdfaquazac
What is the largest decimal integer that can be represented with the following number of bits?
1. 3 bits
2. 8 bits
3. 32 bits
4. 64 bits
How do you find out the largest decimal integer?
Solution
In general, with k bits we can represent 2k values. Their range will depend on the system:
Unsigned: 0 to 2k-1
1. 3 bits
=> 2^3 - 1 => 7 => 111
2. 8 bits
=> 2^8 - 1 => 255
3. 32 bits
=> 2^32 - 1
4. 64 bits
=> 2^64 - 1.
The document contains code for a Throwing class that gets integer input from the user. It uses try/catch blocks to handle exceptions. In the first code block, it catches InputMismatchException and throws an IllegalArgumentException. In the second code block, it changes the catch block to catch IOException instead of IllegalArgumentException and changes the thrown exception accordingly. Both code blocks prompt the user for an integer, catch invalid input, and print an error message.
This electron transport is accompanied by the protons transfer into .pdfaquazac
This electron transport is accompanied by the protons transfer into intermembrane space.
Protons release potential which drives the phosphorylation of ADP to ATP.
Protons return to the matrix through a proton specific channel
Solution
This electron transport is accompanied by the protons transfer into intermembrane space.
Protons release potential which drives the phosphorylation of ADP to ATP.
Protons return to the matrix through a proton specific channel.
Is Email Marketing Really Effective In 2024?Rakesh Jalan
Slide 1
Is Email Marketing Really Effective in 2024?
Yes, Email Marketing is still a great method for direct marketing.
Slide 2
In this article we will cover:
- What is Email Marketing?
- Pros and cons of Email Marketing.
- Tools available for Email Marketing.
- Ways to make Email Marketing effective.
Slide 3
What Is Email Marketing?
Using email to contact customers is called Email Marketing. It's a quiet and effective communication method. Mastering it can significantly boost business. In digital marketing, two long-term assets are your website and your email list. Social media apps may change, but your website and email list remain constant.
Slide 4
Types of Email Marketing:
1. Welcome Emails
2. Information Emails
3. Transactional Emails
4. Newsletter Emails
5. Lead Nurturing Emails
6. Sponsorship Emails
7. Sales Letter Emails
8. Re-Engagement Emails
9. Brand Story Emails
10. Review Request Emails
Slide 5
Advantages Of Email Marketing
1. Cost-Effective: Cheaper than other methods.
2. Easy: Simple to learn and use.
3. Targeted Audience: Reach your exact audience.
4. Detailed Messages: Convey clear, detailed messages.
5. Non-Disturbing: Less intrusive than social media.
6. Non-Irritating: Customers are less likely to get annoyed.
7. Long Format: Use detailed text, photos, and videos.
8. Easy to Unsubscribe: Customers can easily opt out.
9. Easy Tracking: Track delivery, open rates, and clicks.
10. Professional: Seen as more professional; customers read carefully.
Slide 6
Disadvantages Of Email Marketing:
1. Irrelevant Emails: Costs can rise with irrelevant emails.
2. Poor Content: Boring emails can lead to disengagement.
3. Easy Unsubscribe: Customers can easily leave your list.
Slide 7
Email Marketing Tools
Choosing a good tool involves considering:
1. Deliverability: Email delivery rate.
2. Inbox Placement: Reaching inbox, not spam or promotions.
3. Ease of Use: Simplicity of use.
4. Cost: Affordability.
5. List Maintenance: Keeping the list clean.
6. Features: Regular features like Broadcast and Sequence.
7. Automation: Better with automation.
Slide 8
Top 5 Email Marketing Tools:
1. ConvertKit
2. Get Response
3. Mailchimp
4. Active Campaign
5. Aweber
Slide 9
Email Marketing Strategy
To get good results, consider:
1. Build your own list.
2. Never buy leads.
3. Respect your customers.
4. Always provide value.
5. Don’t email just to sell.
6. Write heartfelt emails.
7. Stick to a schedule.
8. Use photos and videos.
9. Segment your list.
10. Personalize emails.
11. Ensure mobile-friendliness.
12. Optimize timing.
13. Keep designs clean.
14. Remove cold leads.
Slide 10
Uses of Email Marketing:
1. Affiliate Marketing
2. Blogging
3. Customer Relationship Management (CRM)
4. Newsletter Circulation
5. Transaction Notifications
6. Information Dissemination
7. Gathering Feedback
8. Selling Courses
9. Selling Products/Services
Read Full Article:
https://digitalsamaaj.com/is-email-marketing-effective-in-2024/
Front Desk Management in the Odoo 17 ERPCeline George
Front desk officers are responsible for taking care of guests and customers. Their work mainly involves interacting with customers and business partners, either in person or through phone calls.
Credit limit improvement system in odoo 17Celine George
In Odoo 17, confirmed and uninvoiced sales orders are now factored into a partner's total receivables. As a result, the credit limit warning system now considers this updated calculation, leading to more accurate and effective credit management.
Join educators from the US and worldwide at this year’s conference, themed “Strategies for Proficiency & Acquisition,” to learn from top experts in world language teaching.
The membership Module in the Odoo 17 ERPCeline George
Some business organizations give membership to their customers to ensure the long term relationship with those customers. If the customer is a member of the business then they get special offers and other benefits. The membership module in odoo 17 is helpful to manage everything related to the membership of multiple customers.
How to Configure Time Off Types in Odoo 17Celine George
Now we can take look into how to configure time off types in odoo 17 through this slide. Time-off types are used to grant or request different types of leave. Only then the authorities will have a clear view or a clear understanding of what kind of leave the employee is taking.
How to Show Sample Data in Tree and Kanban View in Odoo 17Celine George
In Odoo 17, sample data serves as a valuable resource for users seeking to familiarize themselves with the functionalities and capabilities of the software prior to integrating their own information. In this slide we are going to discuss about how to show sample data to a tree view and a kanban view.
Principles of Roods Approach!!!!!!!.pptxibtesaam huma
Principles of Rood’s Approach
Treatment technique used in physiotherapy for neurological patients which aids them to recover and improve quality of life
Facilitatory techniques
Inhibitory techniques
Network security architecture is the planning and design of the camp.pdf
1. Network security architecture is the planning and design of the campus network to reduce
security risks in accordance with the institution’s risk analysis and security policies. It focuses on
reduc-ing security risks and enforcing policy through the design and con-figuration of firewalls,
routers, and other network equipment.
Network security is important because it is one of the means to enforce the policies and
procedures developed by the institution to protect information. It is often referred to as the “front
door” in broader discussions of IT security. To the extent that you can block network access to a
computer, you “lock” the door and provide bet-ter protection for that computer and its contents.
Traditional network design has focused on creating a secure net-work perimeter around the
organization and strategically placing a firewall at the point where the network is connected to
the Inter-net. For higher education, this traditional design is problematic; our constituents need
access from off campus to a large number of machines and services on campus. In addition,
because we have many computers on our campus that we cannot implicitly trust, we also must be
concerned about security threats from inside the perimeter protected by a traditional firewall.
These design issues require a different approach to network security. Although it is impossible to
do justice to the topic of network design in a few pages, there are some best practices that I feel
universities should focus on in terms of network design.
Step 1: Eliminate Network Components That Still UseShared Ethernet
Shared Ethernet switches (or hubs) were developed more than a decade ago to interconnect
multiple computers and networks. These hubs retransmit all network traffic to all computers
connected to that hub. The security implication is that if one computer has its security
compromised it can be used to monitor network traffic com-ing from any other computer that
shares the same hub. This could expose passwords and other sensitive information. Today,
switched Ethernet, which isolates traffic intended for one computer from the view of others on
the same switch, is very inexpensive and, hence, it is worth the cost of replacing older hubs.
Step 2: Embrace and Implement the Concept of Defense and Use Multiple Firewalls Within
Your Network
Commercial and Linux-based firewalls are inexpensive enough that you can deploy these in
multiple locations as needed. It is still bene-ficial to have a firewall separating your institutional
network from the connection to the Internet. This firewall, called a border firewall, will provide a
minimal level of protection for all computers on your net-work. The major benefit of this firewall
is that it allows your network and security staff to quickly block external access should a threat
arise, such as when the “SQL worm” was launched in January 2003 In addition to the border
firewall, consider adding internal firewalls to protect areas that require different levels of
2. security. For example, placing a firewall between the network segments containing the
computers that oper-ate the institutional business systems allows the institution to pro-vide more
restrictive security for those computers. Other areas that firewalls can strengthen include
residential networks and research labs. Each firewall can have different access controls, support
dif-ferent security policies, and allow for distributed administration— all of which are essential
to success in academia
Step 3: Implement Intrusion Detection Systems at Key Points Within Your Network to Monitor
Threats and Attacks
Anintrusion detection system(IDS) looks at the incoming network traffic for patterns that can
signify that a person is probing your net-work for vulnerable computers. The IDS can also look
at traffic leaving your institution for patterns that might indicate that a com-puter’s security has
been compromised. This probing from off cam-pus is usually the first step in attempting to
compromise the security of a computer on your network. IDSs historically have produced daily
reports showing what security vulnerabilities were being tar-geted the day before.
Some vendors are now integrating the IDS with the firewall and renaming these intrusion
prevention systems. When a threat is iden-tified, the IDS automatically works with the firewall to
adjust the firewall rules to protect the computers on the network. IDS prod-ucts are broadly
available through commercial vendors and the open-source community.
Step 4: Implement a Virtual Private Network Concentrator for Off-Campus and Wireless Access
A virtual private network (VPN) uses special software on each com-puter, called a VPN client,
to encrypt network traffic from that computer to a VPN concentrator on the institution’s network.
Using a VPN allows a member of your institution to securely con-nect to campus computers
from an off-campus computer. The VPN will establish an encrypted connection that allows the
off-campus computer to appear as if it were part of your internal campus net-work, thereby
granting access to resources that may be blocked by a border firewall
Solution
Network security architecture is the planning and design of the campus network to reduce
security risks in accordance with the institution’s risk analysis and security policies. It focuses on
reduc-ing security risks and enforcing policy through the design and con-figuration of firewalls,
routers, and other network equipment.
Network security is important because it is one of the means to enforce the policies and
procedures developed by the institution to protect information. It is often referred to as the “front
door” in broader discussions of IT security. To the extent that you can block network access to a
3. computer, you “lock” the door and provide bet-ter protection for that computer and its contents.
Traditional network design has focused on creating a secure net-work perimeter around the
organization and strategically placing a firewall at the point where the network is connected to
the Inter-net. For higher education, this traditional design is problematic; our constituents need
access from off campus to a large number of machines and services on campus. In addition,
because we have many computers on our campus that we cannot implicitly trust, we also must be
concerned about security threats from inside the perimeter protected by a traditional firewall.
These design issues require a different approach to network security. Although it is impossible to
do justice to the topic of network design in a few pages, there are some best practices that I feel
universities should focus on in terms of network design.
Step 1: Eliminate Network Components That Still UseShared Ethernet
Shared Ethernet switches (or hubs) were developed more than a decade ago to interconnect
multiple computers and networks. These hubs retransmit all network traffic to all computers
connected to that hub. The security implication is that if one computer has its security
compromised it can be used to monitor network traffic com-ing from any other computer that
shares the same hub. This could expose passwords and other sensitive information. Today,
switched Ethernet, which isolates traffic intended for one computer from the view of others on
the same switch, is very inexpensive and, hence, it is worth the cost of replacing older hubs.
Step 2: Embrace and Implement the Concept of Defense and Use Multiple Firewalls Within
Your Network
Commercial and Linux-based firewalls are inexpensive enough that you can deploy these in
multiple locations as needed. It is still bene-ficial to have a firewall separating your institutional
network from the connection to the Internet. This firewall, called a border firewall, will provide a
minimal level of protection for all computers on your net-work. The major benefit of this firewall
is that it allows your network and security staff to quickly block external access should a threat
arise, such as when the “SQL worm” was launched in January 2003 In addition to the border
firewall, consider adding internal firewalls to protect areas that require different levels of
security. For example, placing a firewall between the network segments containing the
computers that oper-ate the institutional business systems allows the institution to pro-vide more
restrictive security for those computers. Other areas that firewalls can strengthen include
residential networks and research labs. Each firewall can have different access controls, support
dif-ferent security policies, and allow for distributed administration— all of which are essential
to success in academia
Step 3: Implement Intrusion Detection Systems at Key Points Within Your Network to Monitor
Threats and Attacks
Anintrusion detection system(IDS) looks at the incoming network traffic for patterns that can
4. signify that a person is probing your net-work for vulnerable computers. The IDS can also look
at traffic leaving your institution for patterns that might indicate that a com-puter’s security has
been compromised. This probing from off cam-pus is usually the first step in attempting to
compromise the security of a computer on your network. IDSs historically have produced daily
reports showing what security vulnerabilities were being tar-geted the day before.
Some vendors are now integrating the IDS with the firewall and renaming these intrusion
prevention systems. When a threat is iden-tified, the IDS automatically works with the firewall to
adjust the firewall rules to protect the computers on the network. IDS prod-ucts are broadly
available through commercial vendors and the open-source community.
Step 4: Implement a Virtual Private Network Concentrator for Off-Campus and Wireless Access
A virtual private network (VPN) uses special software on each com-puter, called a VPN client,
to encrypt network traffic from that computer to a VPN concentrator on the institution’s network.
Using a VPN allows a member of your institution to securely con-nect to campus computers
from an off-campus computer. The VPN will establish an encrypted connection that allows the
off-campus computer to appear as if it were part of your internal campus net-work, thereby
granting access to resources that may be blocked by a border firewall