Specifications

Glossary 919
IP address*
A 32-bit number that identifies each sender or receiver of information that is
sent across the Internet. An IP address has two parts: an identifier of a
particular network on the Internet and an identifier of the particular device
(which can be a server or a workstation) within that network.
ISA*
A type of internal computer bus that allows the addition of card-based
components like modems and network adapters. ISA has been replaced by
PCI and is not very common anymore.
ISDN*
A type of broadband Internet connection that provides digital service from the
customer's premises to the dial-up telephone network. ISDN uses standard
POTS copper wiring to deliver voice, data or video.
ISO Network Model*
A network model developed by the International Standards Organization (ISO)
that consists of seven different levels, or layers. By standardizing these layers,
and the interfaces in between, different portions of a given protocol can be
modified or changed as technologies advance or systems requirements are
altered. The seven layers are:
z 1, Physical*
z 2, Data Link*
z 3, Network*
z 4, Transport*
z 5, Session*
z 6, Presentation*
z 7, Application*
z The IEEE 802.11 Standard encompasses the physical layer (PHY) and the
lower portion of the data link layer. The lower portion of the data link layer
is often referred to as the Medium Access Controller (MAC) sub-layer.
IKE
Internet Key Exchange. The Internet Key Exchange (IKE) protocol is a key
management protocol standard which is used in conjunction with the IPSec
standard.
IPSec
IPSec is an IP security feature that provides robust authentication and
encryption of IP packets.