This glossary defines many of the terms and abbreviations related to networking. It includes all the key terms used throughout the book. As with any growing technical field, some terms evolve and take on several meanings. Where necessary, multiple definitions and abbreviation expansions are presented. This glossary also includes some terms that were not covered in the book, but that you may find interesting and useful.
access control list (ACL)
A list kept by Cisco routers to control access to or from the router for a number of services. For example, ACLs prevent packets with a certain IP address from leaving a particular interface on the router.
The access layer in the three-layer hierarchical network model ...