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

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Computer Networking
HDLC (High-level Data Link Control) is

a method of determining which device has access to the transmission medium at any time
network access standard for connecting stations to a circuit-switched network
a very common bit-oriented data link protocol issued by ISO.
None of these
a method access control technique for multiple-access transmission media

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