All Questions
86
questions
1
vote
2
answers
320
views
CSMA/CD - CSMA/CA switch mix
Suppose I have 2 switches; one CSMA/CA (gigabit) and the other CSMA/CD (gigabit), would they work together when connected and if so would there be any dip in network performance?
Thanks in advance!
- 13
3
votes
2
answers
4k
views
What is the difference between CAM and FIB table?
As far I know,
CAM table is Content Addressable Memory table where MAC address is stored
FIB table is Forward Information Base table which is a dynamic table that maps MAC addresses to ports.
Both ...
- 613
0
votes
3
answers
2k
views
Cannot Ping Linux PC through L2 Switch
I’m a little embarrassed to be asking this but here goes.
In a training video for CCENT, I see a switch connected to 2 PCs that are pinging each other on the same subnet. I try to replicate the ...
- 3
3
votes
1
answer
247
views
VLAN Isolate Setup
How can I set up a switch so that devices on one switch port are isolated from devices on other switch ports? I'm guessing this should be done with VLANs, but I'm open to other options as well.
...
- 165
3
votes
2
answers
6k
views
Router vs VLAN in networking?
Why do we need Routers at all when we have VLAN ?
Vlan breaks the broadcast domain.
Vlan along with the use of SVI can be used for routing.
So why do we need routers for in networking ?
- 149
1
vote
1
answer
887
views
Does a switch generate TCN BPDU when it elects a new root bridge?
what are the scenarios in which a switch generates a TCN BPDU other than when a port goes down or come back up?
switch-1---------------switch-2----------------switch-3
(root bridge) (Non Root)...
- 581
1
vote
4
answers
6k
views
One VLAN on two switches
I'm trying to understand the specifics of trunking a VLAN on two switches.
Say I have two switches, both hosting half of VLAN 3.
Switch 1: Ports 0-5 on VLAN 3, Port 6 is Trunk
Switch 2: Ports 0-5 ...
user39822
3
votes
1
answer
3k
views
Bridge for collision domains
I have read that a bridge/switch can be used to increase the number of collision domains in the network, but somewhere I also read that a bridge reduces collision domains. Is it possible for bridge to ...
- 179
3
votes
2
answers
31k
views
What is difference between standard VLAN extended VLAN?
I know that the range of standard VLAN is 1-1005 and in extended VLAN the range is 1-4094.
But is just range is the difference?
- 355
2
votes
1
answer
54
views
Exact trunk operations over an incoming tagged frame
Consider the following example:
H1 --- S1 --- S2 --- S3 --- H2
Hx are hosts, Sx are switches.
Both hosts are connected with access port on VLAN 20 to the corresponding switches, while all the other ...
- 123
8
votes
3
answers
7k
views
Does a switch understand packets? If yes, what is the frame terminology for?
I was a little confused between packet and frame. The confusion was based on, if a switch is a layer 2 device, how does it reads a packet from a layer 3 device, and where is the 'frame' thing which is ...
- 83
2
votes
2
answers
496
views
Understanding VLAN tagging
Let's say we have 4 machines connected to a layer 2, managed switch which is connected to a layer 3 switch. Say that 1.2.3.0/24 is routed to the layer 3 switch. Our goal is to have 1.2.3.0-63 usable ...
- 123
1
vote
2
answers
2k
views
Why does a switch have different MAC addresses?
I am working with Cisco Nexus 3000 switch. I was under the assumption that a switch will always have a single MAC address but when I ran the following command, it displayed two different MAC addresses ...
- 581
6
votes
2
answers
13k
views
Should I disable STP on my access ports?
I'm going to replace some old "central" access switches to some Cisco Catalyst 2960X, and I'm not sure what to do on their STP configurations.
For this network, we have some "central" access switches,...
1
vote
1
answer
924
views
What can cause a Layer 2 Switch to drop frames that aren't malformed?
Recently I replaced a defect Desktop switch with a cisco SG-200-8 switch. After I replaced the old switch everything seemed to work fine. Now the employees have trouble using the scanner through TWAIN....
- 249