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.


A configuration that is based on the concept that multiple, simultaneous server failures are unlikely; therefore, a single backup server can protect multiple active servers. When a server fails, its applications move to the backup server. For example, in a 4-to-1 configuration, one server can protect four servers, which reduces redundancy cost at the server level from 100 percent to 25 percent.