Cisco IPS 7.1 Installation Guide download pdf (Page 382)

Glossary

GL-4

Cisco Intrusion Prevention System Appliance Hardware Installation Guide for IPS 7.1

OL-24002-01

backplane

The physical connection between an interface processor or card and the data buses and the power dis-

tribution buses inside a chassis.

base version

A software release that must be installed before a follow-up release, such as a service pack or signature

update, can be installed. Major and minor updates are base version releases.

benign trigger

A situation in which a signature is fired correctly, but the source of the traffic is nonmalicious.

BIOS

Basic Input/Output System. The program that starts the sensor and communicates between the devices

in the sensor and the system.

blackhole

Routing term for an area of the internetwork where packets enter, but do not emerge, due to adverse

conditions or poor system configuration within a portion of the network.

block

The ability of the sensor to direct a network device to deny entry to all packets from a specified network

host or network.

block interface

The interface on the network device that the sensor manages.

BackOrifice. The original Windows back door Trojan that ran over UDP only.

BO2K

BackOrifice 2000. A Windows back door Trojan that runs over TCP and UDP.

bootloader

A small set of system software that runs when the system first powers up. It loads the operating system

(from the disk, network, external compact flash, or external USB flash), which loads and runs the IPS

application. For the AIM IPS, it boots the module from the network and assists in software installation

and upgrades, disaster recovery, and other operations when the module cannot access its software.

Botnets

A collection of software robots, or bots, that run autonomously and automatically. The term is often

associated with malicious software but it can also refer to the network of computers using distributed

computing software. The term Botnet is used to refer to a collection of compromised computers (called

Zombie computers) running software, usually installed through worms, Trojan horses, or back doors,

under a common command-and-control infrastructure.

Bpdu

Bridge Protocol Data Unit. Spanning-Tree Protocol hello packet that is sent out at configurable inter-

vals to exchange information among bridges in the network.

bypass mode

Mode that lets packets continue to flow through the sensor even if the sensor fails. Bypass mode is only

applicable to inline-paired interfaces.

certification authority. Entity that issues digital certificates (especially X.509 certificates) and vouches

for the binding between the data items in a certificate. Sensors use self-signed certificates.

CA certificate

Certificate for one CA issued by another CA.

CEF

Cisco Express Forwarding. CEF is advanced, Layer 3 IP switching technology. CEF optimizes network

performance and scalability for networks with large and dynamic traffic patterns, such as the Internet,

on networks characterized by intensive Web-based applications, or interactive sessions.

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