Computer Networking
Which network is a cross between circuits switched network and a data-gram network?

Virtual-circuit network
Circuit-switched network
Virtual-circuit identifier
None of these

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Computer Networking
Parity bit is

a check bit appended to an array of binary digits to make the sum of all the binary digits.
an error-detecting code based on a summation operation performed on the bits to be checked.
None of these
the ratio of the number of data units in error to the total number of data units
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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Computer Networking
A T-switch is used to

echo every character that is received
transmit characters one at a time
rearrange the connections between computing equipment
None of these
control how messages are passed between computers

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Computer Networking
Bulletin board system

is a public access message system
None of these
converts analog signals to digital signals
is a modem capable of accepting commands
converts digital signals to analog signals

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