CCNA ICND2 Official Exam Certification Guide (CCNA Exams 640-816 and 640-802), Second Edition

Appendix . Glossary

A

ABR

Area Border Router. A router using OSPF in which the router has interfaces in multiple OSPF areas.

access link

In Frame Relay, the physical serial link that connects a Frame Relay DTE, usually a router, to a Frame Relay switch. The access link uses the same physical layer standards as do point-to-point leased lines.

access rate

See AR.

ACL

Access control list. A list configured on a router to control packet flow through the router, such as to prevent packets with a certain IP address from leaving a particular interface on the router.

administrative distance

In Cisco routers, a means for one router to choose between multiple routes to reach the same subnet when those routes are learned by different routing protocols. The lower the ...