The following commands have been issued on a Catalyst switch:
Which of the following VLANs is allowed on the trunk?
A. VLAN 1 and VLANs 101 through 200
B. VLANs 101 through 200
C. VLANs 1 through 3000
D. VLANs 1 through 4094
Suggested Answer: A
Virtual local area network (VLAN) 1 and VLANs 101 through 200 are allowed on the trunk. The switchport trunk allowed vlan command configures a trunk to carry one or more VLANs. The syntax for the switchport trunk allowed vlan command is switchport trunk allowed vlan {vlan-list | all | {add | except | remove} vlan-list}.
VLANs specified in the vlan-list parameter should be separated by commas. However, if a contiguous group of VLANs is specified, the starting and ending VLAN numbers can be separated by a hyphen.
If no keywords are specified with the switchport trunk allowed vlan command, then only the VLANs contained within the vlan-list parameter will be allowed on the trunk. The all keyword specifies that all VLANs from 1 through 4094 should be allowed on the trunk. The add keyword specifies the VLANs that should be added to the list of VLANs that are already allowed by the trunk. The except keyword specifies that all VLANs from 1 through 4094 are allowed except the listed VLANs.
The remove keyword specifies the VLANs that should be removed from the list of VLANs that are already allowed by the trunk.
In this scenario, the first command issued is switchport trunk allowed vlan all, which allows VLANs 1 through 4094. The second command issued is switchport trunk allowed vlan remove 1,101-4094, which removes VLAN 1 and VLANs 101-4094. Therefore, VLANs 2 through 100 are allowed. The third command issued is switchport trunk allowed vlan except 3001-4094, which specifies that all VLANs should be allowed except VLANs 3001 through 4094. Therefore, VLANs 1 through
3000 are allowed. The fourth command issued is switchport trunk allowed vlan 1, which specifies that only VLAN 1 should be allowed. The fifth command issued is switchport trunk allowed vlan add 101-200, which adds VLANs 101 through 200 to the list of allowed VLANs. Therefore, VLAN 1 and VLANs 101 through 200 are allowed on the trunk.
Objective:
Layer 2 Technologies -
Sub-Objective:
Configure and verify trunking -
References:
Cisco > Cisco IOS Interface and Hardware Component Command Reference > squelch through system jumbomtu > switchport trunk
This question is in 300-115 Implementing Cisco IP Switched Networks (SWITCH) Exam
For getting Cisco Certified Network Professional (CCNP) Routing and Switching Certificate
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