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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.
NTP Network Time Protocol, an Internet standard protocol (built on top of
TCP/IP) that assures accurate synchronization to the millisecond of
computer clock times in a network of computers. Based on UTC, NTP
synchronizes client workstation clocks to the U.S. Naval Observatory
Master Clocks in Washington, DC and Colorado Springs CO. Running
as a continuous background client program on a computer, NTP sends
periodic time requests to servers, obtaining server time stamps and
using them to adjust the client's clock. (RFC1305)
O
OFDM Orthogonal frequency division multiplexing, a method of digital
modulation in which a signal is split into several narrowband
channels at different frequencies. OFDM is similar to conventional
frequency division multiplexing (FDM). The difference lies in the way
in which the signals are modulated and demodulated. Priority is given
to minimizing the interference, or crosstalk, among the channels and
symbols comprising the data stream. Less importance is placed on
perfecting individual channels.
OFDM is used in European digital audio broadcast services. It is also
used in wireless local area networks.
OID Object Identifier.
OPSEC OPSEC (Open Platform for Security) is a security alliance program
created by Check Point to enable an open industry-wide framework
for interoperability of security products and applications. Products
carrying the “Secured by Check Point” seal have been tested to
guarantee integration and interoperability.
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