Firewalls
- 2. The term Firewall comes from the bricks-and-
mortar architectural world. In buildings, a
firewall is a wall built from heat- or fire-resistant
material such as concrete that is intended to
slow the spread of fire through a structure. In the
same way, a network firewall is intended to stop
unauthorized traffic from traveling from one
network to another.The most common
deployment of firewalls occurs between a
trusted network and an untrusted one, typically
the Internet
- 3. 1-Packet filtering routers : It’s implement set
of rules in IP Packet and then it’s send this
packet or discard it .
2- Application level gateway : it’s called
proxy server and it’s work as application level
traffic
3- Circuit level gateway : It’s works between
an open systems Interconnection (OSI)
network models transport and application
layers such as the session layer
- 4. It’s work like filter between the computer and
Internet. There are many different methods
firewalls use to filter out information, and
some are used in combination. These
methods work at different layers of a
network, which determines how specific the
filtering options can be. If an incoming
packet of information is flagged by the
filters, it is not allowed through.
- 5. *Positive effects :
User Authentication :
Some firewalls can be set up to require users
to user name and password ... This way you
can control the type of services that the user
can access them in addition to the possibility
of tracking the activities of users
- 6. *Negative effects :
Firewall crashes could disrupt the network full :
In most cases, the firewall is the only point of
connection between the internal network of
reliable and extranet unreliable and thus disrupt
the firewall or even in the case of incorrect
settings will lead to a breakdown in
communication between the two networks
- 7. Firewall Technical Impact : A firewall really important
because malicious attacks What technology such as
viruses that develop day after day
Firewall social impact : There are people who enjoy to
harm others, such as publishing bad programs such as
viruses, Trojans and other and firewall came as barrier
prevents these hackers and malware from access to
users' computers Thereby benefited society
Firewall economic impact : When the firewall began
running the first time companies competed later on
production, thus affecting economically .
- 8. Legal outcomes of Firewalls :
Contributed to the reduction of electronic
issues .
Technical outcomes of Firewalls : Helped to
increase the safety of electronic devices and
reduce the incidence of damage from hackers
and viruses .
- 9. Software
Devil-Linux
Dotdefender
ipfirewall
PF
Symantec …
Hardware
Cisco PIX
DataPower
SofaWare Technologies