Computer Networking
Modulation is the process of

Multiplexing various signals into high speed line signals
converting digital signals to analog signals
converting analog signals to digital signals
performing data encryption.

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Computer Networking
ICMP (Internet Control Message Protocol) is

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

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