Glossary
GL-9
Cisco Intrusion Prevention System Sensor CLI Configuration Guide for IPS 7.2
OL-29168-01
FQDN
Fully Qualified Domain Name.A domain name that specifies its exact location in the tree hierarchy of
the DNS. It specifies all domain levels, including the top-level domain, relative to the root domain. A
fully qualified domain name is distinguished by this absoluteness in the name space.
FWSM
Firewall Security Module. A module that can be installed in a Catalyst 6500 series switch. It uses the
shun command to block. You can configure the FWSM in either single mode or multi-mode.
G
GBIC
GigaBit Interface Converter. Often refers to a fiber optic transceiver that adapts optical cabling to fiber
interfaces. Fiber-ready switches and NICs generally provide GBIC and/or SFP slots. For more
information, refer to the Catalyst Switch Cable, Connector, and AC Power Cord Guide.
Gigabit Ethernet
Standard for a high-speed Ethernet, approved by the IEEE (Institute of Electrical and Electronics
Engineers) 802.3z standards committee in 1996.
global correlation
The IPS sensor shares information with other devices through a global correlation d atabase to improve
the combined efficacy of all devices.
global correlation
client
The software component of CollaborationApp that ob tains and installs updates to the local global
correlation databases.
global correlation
database
The collective information obtained from and shared with collaborative devices such as IPS sensors.
GMT
Greenwich Mean Time. Time zone at zero degrees longitude. Now called Coordinated Universal Time
(UTC).
GRUB
Grand Unified Bootloader. Boot loader is the first software program that runs when a computer starts.
It is responsible for loading and transferring control to the operating syst em kernel software. The
kernel, in turn, initializes the rest of the operating system.
H
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.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.
half duplex
Capability for data transmission in only one direction at a time between a sending station and a
receiving station. BSC is an example of a half-duplex protocol.
handshake
Sequence of messages exchanged between two or more network devices to e nsure transmission
synchronization.