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

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Computer Networking
X.21 is

a method of determining which device has access to the transmission medium at any time
network access standard for connecting stations to a circuit-switched network
a method access control technique for multiple-access transmission media
a very common bit-oriented data link protocol issued by ISO
None of these

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Computer Networking
What is the purpose of flow control?

To reassemble segments in the correct order at the destination device.
To regulate the size of each segment.
To provide a means for the receiver to govern the amount of data sent by the sender.
To ensure that data is retransmitted if an acknowledgment is not received.

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