Extreme Networks Summit WM20, User Manual

Page: 225 / 270

N
Summit WM20 User Guide, Software Release 4.2
225
MIC Message Integrity Check or Code (MIC), also called "Michael", is part
of WPA and TKIP. The MIC is an additional 8-byte code inserted
before the standard 4-byte integrity check value (ICV) that is
appended in by standard WEP to the 802.11 message. This greatly
increases the difficulty in carrying out forgery attacks.
Both integrity check mechanisms are calculated by the receiver and
compared against the values sent by the sender in the frame. If the
values match, there is assurance that the message has not been
tampered with. (
See WPA, TKIP and ICV).
MTU Maximum Transmission Unit. The largest packet size, measured in
bytes, that a network interface is configured to accept. Any messages
larger than the MTU are divided into smaller packets before being
sent.
MU Mobile Unit, a wireless device such as a PC laptop.
multicast, broadcast,
unicast Multicast: transmitting a single message to a select group of recipients.
Broadcast: sending a message to everyone connected to a network.
Unicast: communication over a network between a single sender and a
single receiver.
N
NAS Network Access Server, a server responsible for passing information
to designated RADIUS servers and then acting on the response
returned. A NAS-Identifier is a RADIUS attribute identifying the NAS
server. (RFC2138)
NAT
Network Address Translator. A network capability that enables a
group of computers to dynamically share a single incoming IP
address. NAT takes the single incoming IP address and creates new IP
address for each client computer on the network.
Netmask In administering Internet sites, a netmask is a string of 0's and 1's that
mask or screen out the network part of an IP address, so that only the
host computer part of the address remains. A frequently-used netmask
is 255.255.255.0, used for a Class C subnet (one with up to 255 host
computers). The ".0" in the "255.255.255.0" netmask allows the specific
host computer address to be visible.
NIC
Network Interface Card. An expansion board in a computer that
connects the computer to a network.
NMS Network Management System. The system responsible for managing a
network or a portion of a network. The NMS talks to network
management agents, which reside in the managed nodes.
M (Continued)