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Glossary

GL-7

Cisco Security Appliance Command Line Configuration Guide

OL-6721-01

GSM

Global System for Mobile Communication. A digital, mobile, radio standard developed for mobile,

wireless, voice communications.

GTP

GPRS tunneling protocol. GTP handles the flow of user packet data and signaling information

between the SGSN and GGSN in a GPRS network. GTP is defined on both the Gn and Gp interfaces

of a GPRS network.

H.225

A protocol used for TCP signalling in applications such as video conferencing. See also H.323 and

inspection engine.

H.225.0

An ITU standard that governs H.225.0 session establishment and packetization. H.225.0 actually

describes several different protocols: RAS, use of Q.931, and use of RTP.

H.245

An ITU standard that governs H.245 endpoint control.

H.320

Suite of ITU-T standard specifications for video conferencing over circuit-switched media, such as

ISDN, fractional T-1, and switched-56 lines. Extensions of ITU-T standard H.320 enable video

conferencing over LANs and other packet-switched networks, as well as video over the Internet.

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.323 RAS

Registration, admission, and status signaling protocol. Enables devices to perform registration,

admissions, bandwidth changes, and status and disengage procedures between Vo I P gateway and the

gatekeeper.

H.450.2

Call transfer supplementary service for H.323.

H.450.3

Call diversion supplementary service for H.323.

Hash, Hash

Algorithm

A hash algorithm is a one way function that operates on a message of arbitrary length to create a

fixed-length message digest used by cryptographic services to ensure its data integrity. MD5 has a

smaller digest and is considered to be slightly faster than SHA-1. Cisco uses both SHA-1 and MD5

hashes within our implementation of the IPSec framework. See also encryption, HMAC, and VPN.

headend

A firewall, concentrator, or other host that serves as the entry point into a private network for VPN

client connections over the public network. See also ISP and VPN.

HMAC

A mechanism for message authentication using cryptographic hashes such as SHA-1 and MD5.

host

The name for any device on a TCP/IP network that has an IP address. See also network and node.

host/network

An IP address and netmask used with other information to identify a single host or network subnet for

security appliance configuration, such as an address translation (xlate) or ACE.

HTTP

Hypertext Transfer Protocol. A protocol used by browsers and web servers to transfer files. When a

user views a web page, the browser can use HTTP to request and receive the files used by the web

page. HTTP transmissions are not encrypted.

HTTPS

Hypertext Transfer Protocol Secure. An SSL-encrypted version of HTTP.

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