Discussion
When a new trunk link is configured on an IOS-based switch, which VLANs are allowed over the link?
Answer: A
Correct answer: By default, all VLANs are allowed on the trunk.
A new trunk carries every VLAN, 1 to 4094, until it is restricted. That is convenient and also a security and stability concern, since a VLAN that need not cross a link still floods its broadcasts over it - which is why switchport trunk allowed vlan is used to prune the list to what the far end actually needs.
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