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Glossary
Description
H.323
H.323 allows dissimilar communication devices to communicate
with each other by using a standardized communication
protocol. H.323 defines a common set of CODECs, call setup
and negotiating procedures, and basic data transport methods.
H
HTTP
（
Hypertext Transfer
Protocol
）
The protocol used by Web browsers and Web servers to
transfer files, such as text and graphic files.
ICMP
（
Internet Control
Messages Protocol
）
Network layer Internet protocol that reports errors and provides
other information relevant to IP packet processing.
Internet
Largest global Internetwork, connecting tens of thousands of
networks worldwide and having a “culture” that focuses on
research and standardization based on real-life use.
IP
（
Internet Protocol
）
Network layer protocol in the TCP/IP stack offering a
connectionless Internetwork service. IP provides features for
addressing, type-of-service specification, fragmentation and
reassembly, and security.
ISP
（
Internet Service
Provider
）
Company that provides Internet access to other companies and
individuals.
IKE
（
Internet Key
Exchange
）
IKE establishes a shared security policy and authenticates keys
for services (such as IPSec) that require keys. Before any IPSec
traffic can be passed, each Router/firewall/host must verify the
identity of its peer.
I
IPsec
（
IP Security
）
A
framework
of
open
standards
that
provides
data
confidentiality, data integrity, and data authentication between
participating peers.
L
LAN
（
Local Area Network
）
High-speed, low-error data network covering a relatively small
geographic area (up to a few thousand meters). LANs connect
workstations, peripherals, terminals, and other devices in a
single building or other geographically limited area.