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You have a router, R1. On it you have a trunk. The config looks like this:
interface GigabitEthernet0/1 switchport trunk encapsulation dot1q switchport trunk native vlan 999 switchport mode trunk media-type rj45 negotiation auto
You then get a new directive from management. There are 4 new vlan's to be added in the network, vlan 67, 68, 69 and 70. These are to be allowed to pass through the trunk, how would you change the config?
R1(config-vlan)# Allow vlan 67-70
R1(config-if)#Switchport trunk allowed vlan add 67-70
None of the alternatives
R1(config-if)#Switchport trunk allowed vlan 67-70
R1(config-vlan)# Allow vlan 67-70 There are no such config-mode.
R1(config-if)#Switchport trunk allowed vlan 67-70 This would allow vlan's from 67-70, but ONLY these.
R1(config-if)#Switchport trunk allowed vlan add 67-70 This would be true if there was already vlan's allowed on the trunk and you want to add to the list.
You wouldn't. The vlans can already pass through the trunk. This is the correct answer, since there are no "allowed vlan" configured on the trunk all vlan's are allowed through.
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