Computer Networking
When a new trunk link is configured on an IOS-based switch, which VLANs are allowed over the link?

Only configured VLAN's are allowed on the link.
Only extended VLAN's are allowed by default.
No VLAN's are allowed, you must configure each VLAN by hand.
By default, all VLANs are allowed on the trunk.

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Computer Networking
What does a VLAN do?

Acts as the fastest port to all servers.
Provides multiple collision domains on one switch port.
Breaks up broadcast domains in a layer 2 switch internetwork.
Provides multiple broadcast domains within a single collision domain.

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