All Questions
155
questions
0
votes
2
answers
359
views
Can a switch segregate traffic that is before the switch from after the switch?
Per the question, Lets try to clarify a bit. Can a switch that has a router connected to it, segregate traffic (using a VLAN) from traffic that is part of the modem/router the switch is connected to?
...
- 11
4
votes
1
answer
619
views
How do data packets travel without merging?
I have been very interested in networking for quite a while, and I have been wondering this question. I've been thinking about this in complete binary, meaning how does a 0 of a data packet not get ...
- 43
2
votes
1
answer
4k
views
What is the EtherType of a BPDU frame sent by a switch which runs Spanning Tree Protocol
I want to know what is the EtherType field of a BPDU frame in various versions and variants of the Spanning Tree Protocol.
- 1,541
7
votes
3
answers
6k
views
Is there any reason to use a hub over a switch?
Given that hubs are essentially the same as switches, as far as I know, except they share bandwidth between all connected devices, while switches do not, resulting in faster connections. I am simply ...
4
votes
1
answer
2k
views
LACP and how to configure switches correctly
I want to set up a fast network and am considering options.
I want a backbone switch that connects all my switches together. I can see options for SFP / SFP+ ports. Some SFP ports are 1 or 2 Gb from ...
- 143
6
votes
2
answers
1k
views
How does Ethernet Switch ensures the validity of the MAC address table?
Let us say I have switch S with 4 ports, PA, PB, PC, and PD, to which I have connected 4 hosts, A, B, C and D with the MAC addresses AA:AA:AA:AA:AA:AA, BB:BB:BB:BB:BB:BB, CC:CC:CC:CC:CC:CC and DD:DD:...
- 707
4
votes
3
answers
1k
views
How is data sent from multiple different sources (computers) to the same destination host (computer) on a local network is handled by switch?
Let us say I have switch S, to which I have connected 4 hosts (A, B, C and D).
Now let us say hosts A and B both want to send a series of data to the same host D at the same time. So here, A and B are ...
- 707
1
vote
2
answers
2k
views
Collision domain in full duplex mode switch
In my understanding switch can operate in half duplex or in full duplex mode.
In half-duplex mode only one wire pair is used, but in full duplex mode two wire pairs are used.
In half duplex mode ...
- 147
0
votes
1
answer
483
views
Circuit Switch TDM Transfer rate
Using TDM circuit switch with 10 slots per frame and each slot consisting of 1000 bits. Suppose there are 10 users and one user suddenly generates one thousand 1000 bit packets, while the others ...
- 499
2
votes
2
answers
960
views
When should the portfast command be used on Cisco switches
Cisco literature states that the portfast command should only be used when connecting a single end station to an access or trunk port.
Can some clarify what is an end station in this context?
Using ...
- 499
1
vote
2
answers
79
views
What is the expected behavior of an interface connected to a switch when it's saturated on multiple sockets?
Say I have a gigabit network interface eth0, that is receiving 1000 megabit transmissions from two other machines on the same switch. What is the expected behavior as far as how throughput is ...
- 113
10
votes
2
answers
2k
views
Can a switch that does not support VLAN process traffic from a Trunk that is not the native VLAN
Recently encountered a setup where the engineer had a Multilayer Cisco switch with a trunk carrying VLAN 41 to an HP switch that did not support VLANs.
What should the HP switch do with the 802.1q ...
- 499
2
votes
4
answers
6k
views
Clarification about CSMA/CD and Switch Ethernet
I'm studying the difference between Hub and Switches.
The first ones are dummy devices who simply repeat the input signal to every output port. The anti-collision protocol CSMA/CD is implemented by ...
- 175
2
votes
2
answers
2k
views
Changing ethernet wiring for Cisco pre-standard PoE
I have a set of 7912G IP Phones, which only accept Cisco pre-standard PoE. To save myself buying a Cisco switch, is it acceptable practice to change the wiring of my ethernet cables slightly and use a ...
- 185
2
votes
2
answers
2k
views
Can I connect to Cisco router's AUX port from a switch Ethernet port?
I know from this question console connection via Cisco router's AUX port
that it's possible to connect from a Cisco router to the switch/router's console port but I would like to know if it's ...
- 145