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.

ARP Address Resolution Protocol

A protocol for mapping an Internet Protocol (IP) address to a physical computer address that is recognized in the local network. When an interface on one computer needs to talk to another interface, it will ARP (that is, send out a broadcast) asking for a response from the interface that matches the IP address. The response contains the hardware address of the interface that has the corresponding IP address.

A low-level TCP/IP protocol, which is used to obtain the MAC address of a device when its IP address is known.