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Glossary: CCNA & General Networking Terms 

 

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LAN
See: Local Area Network
layer
Communication networks for computers may be organized as a set of more or less independent protocols, each in a different layer (also called level). The lowest layer governs direct host-to-host communication between the hardware at different hosts; the highest consists of user applications. Each layer builds on the layer beneath it. For each layer, programs at different hosts use protocols appropriate to the layer to communicate with each other. TCP/IP has five layers of protocols; OSI has seven. The advantages of different layers of protocols is that the methods of passing information from one layer to another are specified clearly as part of the protocol suite, and changes within a protocol layer are prevented from affecting the other layers. This greatly simplifies the task of designing and maintaining communication programs. See also: Open Systems Interconnection, TCP/IP Protocol Suite. [Source: RFC1392]
LDAP
See: Lightweight Directory Access Protocol.
learndirect
The learning services for Ufi are delivered through learndirect, which provides information and advice on high quality courses.
LeNSE
Learning Network for the South East.
Lightweight Directory Access Protocol
This protocol provides access for management and browser applications that provide read/write interactive access to the X.500 Directory. See also: X.500. [Source: RFC1983]
link
A pointer which may be used to retreive the file or data to which the pointer points. [Source: RFC1983]
LINX
London InterNet eXchange, an interconnection point for Internet Service providers in the UK (and elsewhere).
list server
An automated mailing list distribution system. List servers handle the administrivia of mailing list maintenance, such as the adding and deleting of list members. See also: mailing list. [Source: RFC1983]
listserv
An automated mailing list distribution system originally designed for the Bitnet/EARN network. See also: mailing list. [Source: RFC1392]
little-endian
A format for storage or transmission of binary data in which the least significant byte (bit) comes first. See also: big-endian. [Source: RFC1208]
LJUG
See: London JANET User Group
LLC
See: Logical Link Control
LMN
London Metropolitan Network.
Local Area Network (LAN)
A data network intended to serve an area of only a few square kilometers or less. Because the network is known to cover only a small area, optimizations can be made in the network signal protocols that permit data rates up to 100Mb/s. See also: Ethernet, Fibre Distributed Data Interface, token ring, Metropolitan Area Network, Wide Area Network, Wireless Local Area Network. [Source: NNSC]
Logical Link Control (LLC)
The upper portion of the datalink layer, as defined in IEEE 802.2. The LLC sublayer presents a uniform interface to the user of the datalink service, usually the network layer. Beneath the LLC sublayer is the MAC sublayer. See also: 802.x, layer, Media Access Control. [Source: RFC1392]
London JANET User Group (LJUG)
The London JANET User Group presents the views of the users on JANET and UKERNA services to the JISC Committee on Networking through the JANET National User Group. See also: JANET National User Group.
LSC
Learning and Skills Council, successor to FEFC.
LSDA
Learning and Skills Development Agency, successor to FEDA.
Lurking
No active participation on the part of a subscriber to an mailing list or USENET newsgroup. A person who is lurking is just listening to the discussion. Lurking is encouraged for beginners who need to get up to speed on the history of the group. See also: Electronic Mail, mailing list, Usenet. [Source: LAQUEY]
Lycos
Lycos, Inc. is a new venture formed in late June 1995, to develop and market the Lycos technology originally developed under the direction of Dr. Michael ("Fuzzy") Mauldin at Carnegie Mellon University. The part of Lycos you see when you do a search is the search engine. "Lycos" comes from Lycosidae, a cosmopolitan family of relatively large active ground spiders (Wolf Spiders) that catch their prey by pursuit, rather than in a web. [Source: Lycos's FAQ]

 

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