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Glossary
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 correc-
tion), flow control, framing, and software-sublayer addressing. The predom-
inant 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.
local services
Users trying to get to network services that are located on
the same subnet or network are defined as local services. Users do not cross
layer 3 devices and the network services are in the same broadcast domain as
the users. This type of traffic never crosses the backbone.
LocalTalk
Utilizing CSMA/CD, in addition to supporting data transmis-
sion 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.
local VLANs
Local VLANs are configured by geographic location; these
locations can be a building or just a closet in a building, depending on switch
size. Geographically configured VLANs are designed around the fact that the
business or corporation is using centralized resources, like a server farm.
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