Computer Networking
The application layer of a network

defines the user's port into the network
establishes, maintains, and terminates virtual circuits
All of these
consists of software being run on the computer connected to the network
None of these

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Computer Networking
ICMP (Internet Control Message Protocol) is

a TCP/IP high level protocol for transferring files from one machine to another
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 protocol that handles error and control messages

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