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

equalization
None of these
bit stuffing
cyclic redundancy codes
Hamming codes

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Computer Networking
The application layer of a network

None of these
defines the user's port into the network
establishes, maintains, and terminates virtual circuits
All of these
consists of software being run on the computer connected to the network

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Computer Networking
UDP is:

Connection orientated and reliable
None of these
Connection oriented and unreliable
Not a part of the TCP/IP suite
Connectionless and unreliable

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Computer Networking
X.21 is

a method of determining which device has access to the transmission medium at any time
None of these
network access standard for connecting stations to a circuit-switched network
a very common bit-oriented data link protocol issued by ISO
a method access control technique for multiple-access transmission media

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