A is a program that monitors information traveling over a network and .

A computer network exist a collection of computers that share resources that are available on or provided by network nodes.
The computers communicate with one another via digital links using standard communication protocols.
These links are made up of telecommunication network technologies that are based on physically wired, optical, and wireless radio-frequency means and can be configured in a variety of network topologies.
Nodes in a computer network can be personal computers, servers, networking equipment, or other specialized or general-purpose hosts.
They can be identified by network addresses and have hostnames. Hostnames serve as recognizable labels for nodes once assigned and are rarely updated.
Communication protocols such as the Internet Protocol use network addresses to locate and identify nodes.
A sniffer exists as a program that monitors information traveling over a network and exists never legitimately utilized.

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A ________ is a program that monitors information traveling over a network and ________.