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Glossary

GL-2

Cisco Security Appliance Command Line Configuration Guide

OL-6721-01

ARP

Address Resolution Protocol. A low-level TCP/IP protocol that maps a hardware address, or MAC

address, to an IP address. An example hardware address is 00:00:a6:00:01:ba. The first three groups

of characters (00:00:a6) identify the manufacturer; the rest of the characters (00:01:ba) identify the

system card. ARP is defined in RFC 826.

ASA

Adaptive Security Algorithm. Used by the security appliance to perform inspections. ASA allows

one-way (inside to outside) connections without an explicit configuration for each internal system and

application. See also inspection engine.

ASDM

Adaptive Security Device Manager. An application for managing and configuring a single security

appliance.

asymmetric

encryption

Also called public key systems, asymmetric encryption allows anyone to obtain access to the public

key of anyone else. Once the public key is accessed, one can send an encrypted message to that person

using the public key. See also encryption, public key.

authentication

Cryptographic protocols and services that verify the identity of users and the integrity of data. One of

the functions of the IPSec framework. Authentication establishes the integrity of datastream and

ensures that it is not tampered with in transit. It also provides confirmation about the origin of the

datastream. See also AAA, encryption, and VPN.

BGP

Border Gateway Protocol. BGP performs interdomain routing in TCP/IP networks. BGP is an Exterior

Gateway Protocol, which means that it performs routing between multiple autonomous systems or

domains and exchanges routing and access information with other BGP systems. The security

appliance does not support BGP. See also EGP.

BLT stream

Bandwidth Limited Traffic stream. Stream or flow of packets whose bandwidth is constrained.

BOOTP

Bootstrap Protocol. Lets diskless workstations boot over the network as is described in RFC 951 and

RFC 1542.

BPDU

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

intervals to exchange information among bridges in the network. Protocol data unit is the OSI term

for packet.

Certificate Authority, Certification Authority. A third-party entity that is responsible for issuing and

revoking certificates. Each device with the public key of the CA can authenticate a device that has a

certificate issued by the CA. The term CA also refers to software that provides CA services. See also

certificate, CRL, public key, RA.

cache

A temporary repository of information accumulated from previous task executions that can be reused,

decreasing the time required to perform the tasks.

CBC

Cipher Block Chaining. A cryptographic technique that increases the encryption strength of an

algorithm. CBC requires an initialization vector (IV) to start encryption. The IV is explicitly given in

the IPSec packet.

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