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?

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

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Computer Networking
Modulation is the process of

converting digital signals to analog signals
converting analog signals to digital signals
performing data encryption.
Multiplexing various signals into high speed line signals

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