Computer Networking
Establishing a virtual connection is functionally equivalent to

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

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Computer Networking
A WATS arrangement

None of these
is less expensive than flat-rate service only when the number of calls is small and the duration of each is long
is less expensive than flat-rate service only when the number of calls is large and the duration of each is short
is always less expensive than flat-rate service
is never less expensive than flat-rate service

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