Computer Networking
Switching at the network layer in the Internet uses the datagram approach to:

Packet switching
Circuit switching
Message switching
IP switching

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Computer Networking
Error rate is

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.
None of these
an error-detecting code based on a summation operation performed on the bits to be checked.
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

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