D-Link DWL-2200AP [176/192] Multicast

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Glossary
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 Frames 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.
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 a translation table that
maps all internal IP addresses in outbound requests to its own address and converts all
inbound requests to the correct internal host.
NAT serves three main purposes: it provides security by obscurity by hiding internal IP
addresses, enables the use of a wide range of internal IP addresses without fear of conflict
with the addresses used by other organizations, and it allows the use of a single Internet
connection.
Network Address
See IP Address.
NIC
A Network Interface Card is an adapter or expansion board inserted into a computer to
provide a physical connection to a network. Most NICs are designed for a particular type of
network, protocol, and media, for example, Ethernet or wireless.
NTP
The Network Time Protocol assures accurate synchronization of the system clocks in a
network of computers. NTP servers transmit Coordinated Universal Time (UTC, also known
as Greenwich Mean Time) to their client systems. An NTP client sends periodic time requests
to servers, using the returned time stamp to adjust its clock.
OSI
The Open Systems Interconnection (OSI) reference model is a framework for network design.
The OSI model consists of seven layers:
• Layer 1, the Physical layer, identifies the physical medium used for communication between
nodes. In the case of wireless networks, the physical medium is air, and radio frequency (RF)
waves are a components of the physical layer.
• Layer 2, the Data-Link layer, defines how data for transmission will be structured and
formatted, along with low-level protocols for communication and addressing. For example,
protocols such as CSMA/CA and components like MAC addresses, and Frames are all
defined and dealt with as a part of the Data-Link layer.

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