Line access and avoidance of collision are the main functions of

Gaining access to the line and avoiding collisions are handled by network protocols.

The CPU processes instructions and does not manage line access.

The monitor only displays output, unrelated to network access.

A wide area network is a type of network, not the rule set controlling access.

Protocols set the rules by which devices share a communication line.

Add-on: the CSMA CD method controls collisions on classic Ethernet.