Computer Networking
Establishing a virtual connection is functionally equivalent to

Connecting as virtual memory
Physically connecting a DTE and DCE
Placing a telephone call prior to a conversation
Placing a modem prior to a conversation
None of these

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Computer Networking
Error detecting code is

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

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