CCNA Cisco Certified Network Associate Study Guide - FTP Server

654 Glossary
anycast An ATM address that can be shared by more than one end system,
allowing requests to be routed to a node that provides a particular service.
AppleTalk Currently in two versions, the group of communication protocols
designed by Apple Computer for use in Macintosh environments. The
earlier Phase 1 protocols supports one physical network with only one network
number that resides in one zone. The later Phase 2 protocols support
more than one logical network on a single physical network, allowing networks
to exist in more than one zone. See also: zone.
Application layer Layer 7 of the OSI reference network model, supplying
services to application procedures (such as electronic mail or file transfer)
that are outside the OSI model. This layer chooses and determines the availability
of communicating partners along with the resources necessary to
make the connection, coordinates partnering applications, and forms a consensus
on procedures for controlling data integrity and error recovery.
ARA AppleTalk Remote Access: A protocol for Macintosh users establishing
their access to resources and data from a remote AppleTalk location.
area A logical, rather than physical, set of segments (based on either
CLNS, DECnet, or OSPF) along with their attached devices. Areas are commonly
connected to others using routers to create a single autonomous
system. See also: autonomous system.
ARM Asynchronous Response Mode: An HDLC communication mode
using one primary station and at least one additional station, in which transmission
can be initiated from either the primary or one of the secondary units.
ARP Address Resolution Protocol: Defined in RFC 826, the protocol that
traces IP addresses to MAC addresses. See also: RARP.
ASBR Autonomous System Boundary Router: An area border router
placed between an OSPF autonomous system and a non-OSPF network that
operates both OSPF and an additional routing protocol, such as RIP. ASBRs
must be located in a non-stub OSPF area. See also: ABR, non-stub area,
and OSPF.
ASCII American Standard Code for Information Interchange: An 8-bit code
for representing characters, consisting of seven data bits plus one parity bit.