Cisco IPS-4255-K9 - Intrusion Protection Sys 4255 Installation Manual page 381

The collective information obtained from and shared with collaborative devices such as IPS sensors.
global correlation
database
Greenwich Mean Time. Time zone at zero degrees longitude. Now called Coordinated Universal Time
GMT
(UTC).
Grand Unified Bootloader. Boot loader is the first software program that runs when a computer starts.
GRUB
It is responsible for loading and transferring control to the operating system kernel software. The
kernel, in turn, initializes the rest of the operating system.
H
An ITU standard that governs H.225.0 session establishment and packetization. H.225.0 actually
H.225.0
describes several different protocols: RAS, use of Q.931, and use of RTP.
An ITU standard that governs H.245 endpoint control.
H.245
Allows dissimilar communication devices to communicate with each other by using a standardized
H.323
communication protocol. H.323 defines a common set of CODECs, call setup and negotiating
procedures, and basic data transport methods.
Capability for data transmission in only one direction at a time between a sending station and a
half duplex
receiving station. BSC is an example of a half-duplex protocol.
Sequence of messages exchanged between two or more network devices to ensure transmission
handshake
synchronization.
A specialized interface card that pairs physical interfaces so that when a software error is detected, a
hardware bypass
bypass mechanism is engaged that directly connects the physical interfaces and allows traffic to flow
through the pair. Hardware bypass passes traffic at the network interface, does not pass it to the IPS
system.
ARC blocks all traffic from a given IP address.
host block
Hypertext Transfer Protocol. The stateless request/response media transfer protocol used in the IPS
HTTP
architecture for remote data exchange.
An extension to the standard HTTP protocol that provides confidentiality by encrypting the traffic from
HTTPS
the website. By default this protocol uses TCP port 443.
I
Internet Control Message Protocol. Network layer Internet protocol that reports errors and provides
ICMP
other information relevant to IP packet processing. Documented in RFC 792.
Denial of Service attack that sends a host more ICMP echo request ("ping") packets than the protocol
ICMP flood
implementation can handle.
OL-18504-01
Cisco Intrusion Prevention System Appliance and Module Installation Guide for IPS 7.0
Glossary
GL-9