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.

ThreatCon level-4

Level 4/4: Extreme: Full alert.

This condition applies when extreme global network incident activity is in progress. Implementation of measures in this threat condition for more than a short period probably will create hardship and affect the normal operations of network infrastructure.

Symantec DeepSight Threat Analysts have never issued a level 4 ThreatCon alert.