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Glossary

GL-7

Cisco 6400 Software Setup Guide

OL-1183-04

kbps kilobits per second.

L2F

Layer 2 Forwarding. Protocol that supports the creation of secure virtual private dial-up networks over

the Internet.

L2TP Layer 2 Tunneling Protocol. An Internet Engineering Task Force (IETF) standards track protocol

defined in RFC 2661 that provides tunneling of PPP. Based upon the best features of L2F and PPTP,

L2TP provides an industry-wide interoperable method of implementing VPDN.

LAC L2TP access concentrator. A node that acts as one side of an L2TP tunnel endpoint and is a peer to the

L2TP network server (LNS). The LAC sits between an LNS and a remote system and forwards packets

to and from each. Packets sent from the LAC to the LNS requires tunneling with the L2TP protocol as

defined in this document. The connection from the LAC to the remote system is either local or a PPP

link.

LAN

local-area network. High-speed, low-error data network covering a relatively small geographic area (up

to a few thousand meters). LANs connect workstations, peripherals, terminals, and other devices in a

single building or other geographically limited area. LAN standards specify cabling and signaling at

the physical and data link layers of the OSI model. Ethernet, FDDI, and Token Ring are widely used

LAN technologies.

LATA local access and transport area. A geographic territory used primarily by local telephone companies to

determine charges for intrastate calls. As a result of the Bell divestiture, switched calls that both begin

and end at points within the LATA (intraLATA) are generally the sole responsibility of the local

telephone company, while calls that cross outside the LATA (interLATA) are passed on to an Inter

eXchange Carrier (IXC).

LED light emitting diode. Semiconductor device that emits light produced by converting electrical energy.

Status lights on hardware devices are typically LEDs.

leg

The endpoint of an internal connection. A cross-connect connects two legs together. For SVCs and soft

PVCs, a leg can be a source leg or a destination leg. Also referred to as a “connection leg” or “half-leg.”

LEC local exchange carrier. Local or regional telephone company that owns and operates a telephone

network and the customer lines that connect to it.

LNS L2TP network server. A node that acts as one side of an L2TP tunnel endpoint and is a peer to the L2TP

access concentrator (LAC). The LNS is the logical termination point of a PPP session that is being

tunneled from the remote system by the LAC. Analogous to the Layer 2 Forwarding (L2F) home

gateway (HGW).

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Cisco 6400 Einstellungsanleitung Seite 181