Hirschmann MACH 1000, Справочное руководство

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Glossary
CLI L2P
Release 7.0 05/2011
552
the type of server hosting the
directory.
Learning. The bridge examines the
Layer 2 source addresses of every
frame on the attached networks
(called listening) and then maintains
a table, or cache, of which MAC
addresses are attached to each of
its ports.
Link-State. In routing protocols, the
declared information about the
available interfaces and available
neighbors of a router or network.
The protocol's topological database
is formed from the collected link-
state declarations.
LLDP. The IEEE 802.1AB standard
for link layer discovery in Ethernet
networks provides a method for
switches, routers and access points
to advertise their identification,
configuration and capabilities to
neighboring devices that store the
data in a MIB (management
information base). Link layer
discovery allows a network
management system to model the
topology of the network by
interrogating the MIB databases in
the devices.
Local Area Network. A group of
computers that are located in one
area and are connected by less than
1,000 feet of cable. A typical LAN
might interconnect computers and
peripherals on a single floor or in a
single building. LANs can be
connected together, but if modems
and telephones connect two or more
LANs, the larger network constitutes
what is called a WAN or Wide Area
Network.
M
MAC. (1) Medium Access Control.
In LANs, the sublayer of the data link
control layer that supports medium-
dependent functions and uses the
services of the physical layer to
provide services to the logical link
control (LLC) sublayer. The MAC
sublayer includes the method of
determing when a device has
access to the transmission medium.
(2) Message Authentication Code. In
computer security, a value that is a
part of a message or accompanies a
message and is used to determine
that the contents, origin, author, or
other attributes of all or part of the
message are as they appear to be.
(
IBM Glossary of Computing Terms
)
Management Information Base.
When SNMP devices send SNMP
messages to the management
console (the device managing
SNMP messages), it stores
information in the MIB.
MBONE. See “Multicast Backbone”
on page 553.
MDC. Management Data Clock.
MDI. Management Data Interface.
MDIO. Management Data Input/
Output.