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?

Teleprocessor
Attenuation
None of these
Modem
Interface

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Computer Networking
Bus is

a continuous frequency capable of being modulated or impressed with a second signal
a collection of interconnected functional units that provides a data communications service among stations attached to the network
the condition when two or more stations attempt to use the same channel at the same time
one or more conductors that some as a common connection for a related group of devices
None of these

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