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

None of these
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
the interface between the X.25 network and packet mode device
All of these

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Computer Networking
Which statement describes a spanning-tree network that has converged?

All switch and bridge ports are assigned as either root or designated ports.
All switch and bridge ports are in the forwarding state.
All switch and bridge ports are either blocking or looping.
All switch and bridge ports are in either the forwarding or blocking state.

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