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
Interface
None of these
Modem

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Computer Networking
The network layer, in reference to the OSI model, provide

the virtual circuit interface to packet-switched service
data link procedures that provide for the exchange of data via frames that can be sent and received
the interface between the X.25 network and packet mode device
None of these
All of these

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Computer Networking
What is the purpose of Spanning Tree Protocol in a switched LAN?

To prevent routing loops in networks with redundant paths
To prevent switching loops in networks with redundant switched paths
To provide a mechanism for network monitoring in switched environments
To manage the VLAN database across multiple switches
To create collision domains

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Computer Networking
If a switch receives a frame and the source MAC address is not in the MAC address table but the destination address is, what will the switch do with the frame?

Discard it and send an error message back to the originating host
Add the destination to the MAC address table and then forward the frame
Flood the network with the frame
Add the source address and port to the MAC address table and forward the frame out the destination port

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