Computer Networking
X.21 is

a very common bit-oriented data link protocol issued by ISO
None of these
a method access control technique for multiple-access transmission media
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

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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 source address and port to the MAC address table and forward the frame out the destination port
Add the destination to the MAC address table and then forward the frame
Flood the network with the frame

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Computer Networking
Bandlimited signal is

a signal all of whose energy is contained within a finite frequency range
None of these
transmission of signals without modulation
simultaneous transmission of data to a number of stations
All of these

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