Computer Networking
The data-link layer, in reference to the OSI model, specifies

data link procedures that provide for the exchange of data via frames that can be sent and received
None of these
All of these
the interface between the X.25 network and packet mode device
the virtual circuit interface to packet-switched service

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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?

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.
Only extended VLAN's are allowed by default.

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