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

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

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Computer Networking
Which of the following characteristic(s) is/are suited to the PSS applications?

All of these
bursty traffic and low communications intensity
Multiple remote host or applications accessed by a single local access circuit terminal and circuit
widely dispersed terminals and access to international packets switched services
None of these

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Computer Networking
Parity bit is

None of these
a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression, the resulting expression will not conform to the rules of construction and
an error-detecting code based on a summation operation performed on the bits to be checked.
the ratio of the number of data units in error to the total number of data units
a check bit appended to an array of binary digits to make the sum of all the binary digits.

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