Computer Networking
Computers cannot communicate with each other directly over telephone lines because they use digital pulses whereas telephone lines use analog sound frequencies. What is the name of the device which permits digital to analog conversion at the start of a long distance transmission?

Modem
Attenuation
Teleprocessor
Interface
None of these

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Computer Networking
What is the purpose of flow control?

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

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Computer Networking
The application layer of a network

None of these
consists of software being run on the computer connected to the network
defines the user's port into the network
All of these
establishes, maintains, and terminates virtual circuits

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