Computer Networking
Carrier is

a continuous frequency capable of being modulated or impressed with a second signal
the condition when two or more sections attempt to use the same channel at the same time
One or more conductors that serve as a common connection for a related group of devices
None of these
a collection of interconnected functional units that provides a data communications service among stations attached to the network

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

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

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