Glossary Description
H
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
and negotiating procedures, and basic data transport methods.
HTTP（
Protocol）
The protocol used by Web browsers and Web servers to
transfer files, such as text and graphic files.
I
ICMP（Internet Control
Messages Protocol）
Network layer Internet protocol that reports
other information relevant to IP packet processing.
Internet
Largest global Internetwork, connecting tens of thousands of
networks worldwide and having a “
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 specificat
reassembly, and security.
ISP（Internet Service
Provider）
Company that provides Internet access to other companies
individuals.
IKE （Internet Key
Exchange）
IKE establishes a shared security policy and authenticates
for services (such as IPSec) that require keys. Before any IPSec
traffic can be passed, each r
outer/firewall/host must verify the
identity of its peer.
IPsec（IP Security）
A framework of open standards that provides data
confidentiality, data integrity, and dat
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.
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