D-Link DWL-8500AP, Руководство администратора, Страница: 161 / 168

Glossary
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Lease Time
The Lease Time specifies the period of time the
DHCP Server gives its clients an IP Address and
other required information. When the lease expires,
the client must request a new lease. If the lease is set
to a short span, you can update your network
information and propagate the information provided
to the clients in a timely manner.
LLC
The Logical Link Control (LLC) layer controls frame
synchronization, flow control, and error checking. It
is a higher level protocol over the
PHY layer,
working in conjunction with the MAC layer.
M
MAC
The Media Access Control (MAC) layer handles
moving data packets between
NIC s across a shared
channel. It is a higher level protocol over the PHY
layer. It provides an arbitration mechanism in an
attempt to prevent signals from colliding.
It uses a hardware address, known as the MAC
address, that uniquely identifies each node of a
network.
IEEE 802 network devices share a common
48-bit MAC address format, displayed as a string of
twelve (12) hexadecimal digits separated by colons,
for example
FE:DC:BA:09:87:65
.
Managed Mode
In Managed Mode, the D-Link Access Point is part
of the D-Link Unified Wired/Wireless Access
System, and you manage it by using the D-Link
Unified Switch. If an AP is in Managed Mode, the
Administrator Web UI is disabled.
MDI and MDI-X
Medium Dependent Interface (MDI) and MDI
crossover (MDIX) are twisted pair cabling
technologies for Ethernet ports in hardware devices.
Built-in twisted pair cabling and auto-sensing enable
connection between like devices with the use of a
standard Ethernet cable. (For example, if a wireless
access point supports MDI/MDIX, one can
successfully connect a PC and that access point with
an Ethernet cable rather than having to use a
crossover cable).
MIB
Management Information Base (MIB) is a virtual
database of objects used for network management.
SSID agents along with other SNMP tools can be
used to monitor any network device defined in the
MIB.
MSCHAP V2
Microsoft Challenge Handshake Authentication
Protocol Version 2 (MSCHAP V2) provides
authentication for
PPP connections between a
Windows-based computer and an Access Point or
other network access device.
MTU
The Maximum Transmission Unit is the largest
physical packet size, measured in bytes, that a
network can transmit. Any messages larger than the
MTU are fragmented into smaller packets before
being sent.
Multicast
A Multicast sends the same message to a select group
of recipients. Sending an e-mail message to a mailing
list is an example of multicasting. In wireless
networks, multicast usually refers to an interaction in
which the access point sends data traffic in the form
of
IEEE 802.1X Frame s to a specified set of client
stations ( MAC addresses) on the network.
Some wireless security modes distinguish between
how unicast, multicast, and broadcast frames are
encrypted or whether they are encrypted.
See also Unicast and Broadcast .
N
NAT
Network Address Translation is an Internet standard
that masks the internal IP addresses being used in a
LAN . A NAT server running on a gateway maintains