Computer Networking
A communications device that combines transmissions from several I/O devices into one line is a:

None of these
full-duplex line
modifier
concentrator
multiplexer

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Computer Networking
Ethernet networks can be cabled in a number of topologies, depending on what works best in each environment. As more nodes are added, the efficiency of Ethernet decreases. Select the best answer as to why Ethernet becomes less efficient as size increases.

Cable terminators do not absorb the signal properly
Repeaters cannot increase the signal strength sufficiently
Network collisions occur
Cable terminators do not reflect the signal properly
"Line echo" occurs due to the impedance of the cable

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