Refer to the exhibit. A network engineer must configure communication between PC A and the File Server. To prevent interruption for any other communications, which command must be configured?
The switchport trunk allowed vlan command is used to specify the list of VLANs that are allowed on a trunk port. When a Layer 2 interface on a Cisco IOS device is configured to operate in trunk mode, the default setting is for the interface to carry all of the VLANs defined on the switch.
When configuring a switch interface as a trunk, unless you use the "switchport trunk allowed vlan" syntax, ALL VLANS are allowed to pass through the trunk.
And this happened on Switch B, interface Gi0/1.
On Switch A, interface Gi0/1 was configured to allow VLANs 10 to 12 through. But PC A (on Gi0/4) is inside VLAN 13. Then, you need to add VLAN 13 to allowed VLANs through interface Gi0/1.
And the syntax is:
interface GigabitEthernet0/1
switchport trunk allowed vlan add 13
Adding Vlan 13 wont change anything as PC and Srv are in different Vlan. Correct is B, if you dissable allowed vlans. All Vlans will be allowed on the Trunk.
that's not how to disable allowed vlan. to disable those vlan you have to use "no switchport trunk allowed vlan 10-12". if you use switchport allowed vlan none, means that none VLAN will be allowed. not even 13
If this Question really is about to add VLAN 13, you have do add it on A & B. Otherwise both devices seem to be not necessarily within VLAN 13 and maybe should just use the nativ VLAN to communicate ?!
Looks like Switch B is missing the Switchport trunk allowed VLAN command....lol
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