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

cyclic redundancy codes
None of these
Hamming codes
bit stuffing
equalization

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Computer Networking
The network layer, in reference to the OSI model, provide

All of these
the virtual circuit interface to packet-switched service
None 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

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