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

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

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

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