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Glossary
GL-3
Cisco Access Registrar 3.5 Concepts and Reference Guide
OL-2683-02
F
FT
Field Technician is someone who installs your cable modem in your house.
Frame Relay
Frame Relay is a cost-effective, lightweight, many-to-many, medium-speed, virtual network, link-layer
technology.
I
ISDN
Integrated Services Digital Network enables synchronous PPP access.
ISP
Internet Service Provider is a company that provides Internet connectivity.
H
HDLC
High-level Data Link Control is both a point-to-point and multiparty link-layer technology. HDLC
provides reliable, acknowledged transfer across dedicated links.
L
L2TP Access
Concentrator (LAC)
LAC is a device attached to one or more PSTN or ISDN lines capable of PPP operation and of handling
the L2TP protocol. The LAC needs only to implement the media over which L2TP is to operate to pass
traffic to one or more LNSs. It may tunnel any protocol carried within PPP.
LAN
Local Area Network consists of all of the components that create a system up to a router. These
components include cables, repeaters, bridges, and software up to the network layer.
LDAP
Lightweight Directory Access Protocol provides a standard way for Internet clients, applications, and
WWW servers to access directory information across the Internet such as user names, e-mail addresses,
security certificates, and other contact information.
LEAP
Light Extensible Authentication Protocol—
LLC
Logical Link Control is an interface that defines several common interfaces between higher-level
protocols (for example, IP) and the networks they ride upon (for example, Ethernet, Token Ring, and
others).
L2TP Network
Server (LNS)
An LNS operates on any platform capable of PPP termination. The LNS handles the server side of the
L2TP protocol. Since L2TP relies only on the single media over which L2TP tunnels arrive, the LNS
may have only a single LAN or WAN interface, yet still be able to terminate calls arriving at any LAC's
full range of PPP interfaces (async, synchronous ISDN, V.120, etc.).