Glossary
A
ABR 1. Area Border Router. Router located on the border of one or more OSPF areas that connects those areas to the backbone network. 2. available bit rate. QoS class for ATM networks. ABR provides a feedback mechanism that lets traffic sources adapt their transmissions to changing network conditions to facilitate low cell loss and the fair sharing of available bandwidth. ABR provides no guarantees in terms of cell loss or delay. Compare with CBR, UBR, and VBR.
access control list See ACL.
access layer One of three layers in a hierarchical network topology, provides users on local segments access to the internetwork. Compare with core layer and distribution layer. See also hierarchical network design.
access server See remote-access ...
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