CCNA Cisco Certified Network Associate Study Guide - FTP Server

652 Glossary
address learning Used with transparent bridges to learn the hardware
addresses of all devices on an internetwork. The switch then filters the network
with the known hardware (MAC) addresses.
address mapping By translating network addresses from one format
to another, this methodology permits different protocols to operate
interchangeably.
address mask A bit combination descriptor identifying which portion of
an address refers to the network or subnet and which part refers to the host.
Sometimes simply called the mask. See also: subnet mask.
address resolution The process used for resolving differences between
computer addressing schemes. Address resolution typically defines a method
for tracing Network layer (Layer 3) addresses to Data-Link layer (Layer 2)
addresses. See also: address mapping.
adjacency The relationship made between defined neighboring routers
and end nodes, using a common media segment, to exchange routing information.
administrative distance A number between 0 and 225 that expresses the
value of trustworthiness of a routing information source. The lower the
number, the higher the integrity rating.
administrative weight A value designated by a network administrator to
rate the preference given to a network link. It is one of four link metrics
exchanged by PTSPs to test ATM network resource availability.
ADSU ATM Data Service Unit: The terminal adapter used to connect to an
ATM network through an HSSI-compatible mechanism. See also: DSU.
advertising The process whereby routing or service updates are transmitted
at given intervals, allowing other routers on the network to maintain
a record of viable routes.
AEP AppleTalk Echo Protocol: A test for connectivity between two Apple-
Talk nodes where one node sends a packet to another and receives an echo,
or copy, in response.
AFI Authority and Format Identifier: The part of an NSAP ATM address
that delineates the type and format of the IDI section of an ATM address.