Cisco PIX 525 Dokumentacja Pobierz pdf (Strona 574)

100

101

Glossary

GL-6

Cisco Security Appliance Command Line Configuration Guide

OL-6721-01

failover, failover

mode

Failover lets you configure two security appliances so that one will take over operation if the other

one fails. The security appliance supports two failover configurations, Active/Active failover and

Active/Standby failover. Each failover configuration has its own method for determining and

performing failover. With Active/Active failover, both units can pass network traffic. This lets you

configure load balancing on your network. Active/Active failover is only available on units running

in multiple context mode. With Active/Standby failover, only one unit passes traffic while the other

unit waits in a standby state. Active/Standby failover is available on units running in either single or

multiple context mode.

Fixup

See inspection engine.

Flash, Flash

memory

A nonvolatile storage device used to store the configuration file when the security appliance is

powered down.

FQDN/IP

Fully qualified domain name/IP address. IPSec parameter that identifies peers that are security

gateways.

FragGuard

Provides IP fragment protection and performs full reassembly of all ICMP error messages and virtual

reassembly of the remaining IP fragments that are routed through the security appliance.

FTP

File Transfer Protocol. Part of the TCP/IP protocol stack, used for transferring files between hosts.

GGSN

gateway GPRS support node. A wireless gateway that allows mobile cell phone users to access the

public data network or specified private IP networks.

global

configuration mode

Global configuration mode lets you to change the security appliance configuration. All user EXEC,

privileged EXEC, and global configuration commands are available in this mode. See also user EXEC

mode, privileged EXEC mode, command-specific configuration mode.

GMT

Greenwich Mean Time. Replaced by UTC (Coordinated Universal Time) in 1967 as the world time

standard.

GPRS

general packet radio service. A service defined and standardized by the European Telecommunication

Standards Institute. GPRS is an IP-packet-based extension of GSM networks and provides mobile,

wireless, data communications

GRE

Generic Routing Encapsulation described in RFCs 1701 and 1702. GRE is a tunneling protocol that

can encapsulate a wide variety of protocol packet types inside IP tunnels, creating a virtual

point-to-point link to routers at remote points over an IP network. By connecting multiprotocol

subnetworks in a single-protocol backbone environment, IP tunneling using GRE allows network

expansion across a single protocol backbone environment.

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