Glossary

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.

loopback

A diagnostic test that returns the transmitted signal to the sending device after it has passed through a network. The returned signal can then be compared to the transmitted one. The discrepancy between the two helps to trace the fault.