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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.