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.

ICMP Internet Control Message Protocol

An Internet protocol (defined in RFC 792) that is primarily for reporting errors in TCP/IP messages and exchanging limited status and control information.

Used to send error messages from networked computers.

An extension to the Internet Protocol (IP). It allows for generation of error messages, test packets, and the informational messages that are related to IP.