CCNA Cisco Certified Network Associate Study Guide - FTP Server

Glossary 687
LLAP LocalTalk Link Access Protocol: In a LocalTalk environment, the data
link-level protocol that manages node-to-node delivery of data. This protocol
provides node addressing and management of bus access, and it also controls
data sending and receiving to assure packet length and integrity.
LLC Logical Link Control: Defined by the IEEE, the higher of two Data-
Link layer sublayers. LLC is responsible for error detection (but not correction),
flow control, framing, and software-sublayer addressing. The predominant
LLC protocol, IEEE 802.2, defines both connectionless and
connection-oriented operations. See also: Data Link layer and MAC.
LMI An enhancement to the original Frame Relay specification. Among the
features it provides are a keepalive mechanism, a multicast mechanism,
global addressing, and a status mechanism.
LNNI LAN Emulation Network-to-Network Interface: In the Phase 2
LANE specification, an interface that supports communication between the
server components within one ELAN.
local explorer packet In a Token Ring SRB network, a packet generated
by an end system to find a host linked to the local ring. If no local host can
be found, the end system will produce one of two solutions: a spanning
explorer packet or an all-routes explorer packet.
local loop Connection from a demarcation point to the closest switching
office.
LocalTalk Utilizing CSMA/CD, in addition to supporting data transmission
at speeds of 230.4Kbps, LocalTalk is Apple Computer’s proprietary
baseband protocol, operating at the Data Link and Physical layers of the OSI
reference model.
LSA link-state advertisement: Contained inside of link-state packets
(LSPs), these advertisements are usually multicast packets, containing information
about neighbors and path costs, that are employed by link-state protocols.
Receiving routers use LSAs to maintain their link-state databases and,
ultimately, routing tables.
LUNI LAN Emulation User-to-Network Interface: Defining the interface
between the LAN Emulation Client (LEC) and the LAN Emulation Server,
LUNI is the ATM Forum’s standard for LAN Emulation on ATM networks.
See also: LES and LECS.