Computer Networking
Error detection at a data link level is achieved by

None of these
Hamming codes
bit stuffing
cyclic redundancy codes
equalization

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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?

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

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