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

Hamming codes
None of these
equalization
bit stuffing
cyclic redundancy codes

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Computer Networking
The physical layer, in reference to the OSI model, defines

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

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