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Table Of Contents  CertiGuide to Network+
 9  Glossary

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(Page 1 of 5) L2TP

Layer Two Tunneling Protocol. An extension of the Point-to-Point Tunneling Protocol (PPTP). Refer to PPTP, L2TP, VPN.

LAN

Local Area Network. Two or more computers connected within a local area, I.E. an office. When connecting PC’s there are two common configurations.

Client/Server

One or more computer which contain a centralized database to act as a control agent for which person, department (group) can or cannot access a particular resource such as data or printers. User names/passwords and management of the network is centralized.

Peer-to-Peer

Two or more computers on a network, with one or more are sharing resources. If password control is in effect, each password is stored on the local PC. I.E. if 5 computers are each sharing a resource, up to 10 different passwords may be involved. 5 passwords for full access and 5 passwords for read-only. No advanced management features such as: depends on time of day or week, audit lists, etc.

Last Known Good Configuration

A hardware configuration available by pressing F8 during startup. If the current hardware settings prevent the computer from starting, the Last Known Good Configuration can allow the computer to be started and the configuration to be examined. When the Last Known Good Configuration is used, later configuration changes are lost.

Layer

Distinct service(s) that build to complete an operation I.E. Networking

Layer 2 forwarding (L2F)

Permits the tunneling of the link layer of higher-level protocols. Using these tunnels, it is possible to separate the location of the initial dial-up server from the physical location at which the dial-up protocol connection is terminated and access to the network is provided.

Layer two Tunneling Protocol (L2TP)

A tunneling protocol that encapsulates PPP frames to be sent over IP, X.25, Frame Relay, or ATM networks. L2TP is a combination of the Point-to-Point Tunneling Protocol (PPTP) and Layer 2 Forwarding (L2F), a technology proposed by Cisco Systems, Inc.

LED

Light Emitting Diode. a semiconductor producing a red, green, yellow or blue light, depending upon chemical composition. May be combined to produce a White light.


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