Computer Networking
Which of the following does not allow multiple users or devices to share one communications line?

None of these
concentrator
multipplexer
controller
doubleplexer

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Computer Networking
ARP (Address Resolution Protocol) is

a protocol that handles error and control messages
a TCP/IP protocol used to dynamically bind a high level IP Address to a low-level physical hardware address
a protocol used to monitor computers
None of these
a TCP/IP high level protocol for transferring files from one machine to another

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