The glossary below contains many of the terms you will find in common use throughout the Symantec Security Response website. Please refer to this list to find definitions of terms and answers to other Internet security-related questions.

MAC Media Access Control

On a network, a computer’s unique hardware number. The MAC address is used by the Media Access Control sublayer of the Data Link Control (DLC) layer of telecommunication protocols. There is a different MAC sublayer for each physical device type. The data-link layer is the protocol layer in a program that handles the moving of data in and out across a physical link in a network.