All Questions
16
questions
0
votes
2
answers
455
views
How do layer-2 devices (bridges/switches) join a multicast MAC address?
I was going through the IEEE 802.1Q (2018) standard on my own. The standard speaks about group addresses, and how these group addresses are learned by transit bridges, which is all fine.
But how do ...
- 63
6
votes
2
answers
4k
views
How do I know the switch is layer 2 or layer 3?
Is it possible to find the switch is Layer3 or Layer2 in (Switch)CLI? Is there any command to check whether the switch Layer(Layer 3 or 2) in CLI?
- 125
3
votes
4
answers
2k
views
LACPDU packets to pass through unmanaged switch
I have two buildings connected through the CAT6 cable and both ends have cisco-sg350 (capable of etherchannel). Due to the limitations of the cable both the switches are connected through a unmanaged ...
2
votes
1
answer
3k
views
Ping across VLANs using layer 2 switch
I'm trying to ping one PC on one particular VLAN (VLAN 80) from another PC on a different VLAN (VLAN 50). I have a layer 2 switch (Cisco 2950T), so I can't do it from within itself.
How would I be ...
- 63
4
votes
3
answers
1k
views
Collision domain question
I'm studying for my CCENT exam, and not quite sure why the book (official Cisco) says that there are 5 collision domains in this example. Isn't it supposed to be 4? The hub on the left, the hub in the ...
4
votes
2
answers
3k
views
Nexus 3172T MTU
I am attempting to set the L3 mtu on a Nexus port.
The mtu option is only available if I set "no switchport" which then prevents me configuring VLAN related settings.
Am I missing something obvious? ...
- 127
1
vote
1
answer
2k
views
Layer 3 switch model 3950 encapsulation
How to ensure trunk link in the switch are using dot1q encapsulation, when dtp (dynamic trunking protocol) is enable along with vtp.
I know when manually setting trunk links, you can force the trunk ...
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
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
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
2
votes
2
answers
159
views
Cisco 3570x stack behaviour
Could you please advise on following:
We have two Cisco 3570x switches in a stack (switches have no Stack Power).
What will be the behavior if:
Master switch will be powered off. Will Slave reboot ...
- 163
3
votes
3
answers
12k
views
Native VLAN on a router subinterface (RoAS)
I am aware of all the background information to native VLANs, just to repeat here that they are used for 'control traffic', that is CDP / VTP / PAgP / DTP.
On a router, sub-interfaces can be defined ...
- 43
1
vote
1
answer
337
views
DTP mode desirable and on
the on mode still negotiable (send/receive DTP) until i set it no negotiate so what is the Difference between on and Desirable.
please give an example :))
- 41
2
votes
1
answer
450
views
To connect 3 LAN to a switch
I have to connect three LAN networks to a node through 24 fiber FO cable. The node contains three different networks a PLC,a security system, a CCTV network. Should I go for three separate CISCO ...
- 21
2
votes
1
answer
648
views
Cisco ME3x00 - QoS for layer 2 trunks
I have some ME3800's running 15.3(3)S which aggregate layer 2 circuits from customers. They all have a similar configuration of an incoming trunk on Gi0/1 and then Gi0/23 & Gi0/24 are layer 3 p-t-...
- 5,300