Computer Networking
The MAC (Media Access Control) address of the network card is used in both Ethernet and Token-Ring networks and is essential for communication. What does MAC provide?

A physical address that is assigned by the manufacturer
A physical address that is randomly assigned each time the computer is started
A logical address that identifies the workstation
The logical domain address for the workstation
An alias for the computer name

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Computer Networking
A WATS arrangement

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

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