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Glossary

GL-5

Cisco Security Appliance Command Line Configuration Guide

OL-6721-01

Distinguished Name. Global, authoritative name of an entry in the OSI Directory (X.500).

DNS

Domain Name System (or Service). An Internet service that translates domain names into IP

addresses.

DoS

Denial of Service. A type of network attack in which the goal is to render a network service

unavailable.

DSL

digital subscriber line. Public network technology that delivers high bandwidth over conventional

copper wiring at limited distances. DSL is provisioned via modem pairs, with one modem located at

a central office and the other at the customer site. Because most DSL technologies do not use the

whole bandwidth of the twisted pair, there is room remaining for a voice channel.

DSP

digital signal processor. A DSP segments a voice signal into frames and stores them in voice packets.

DSS

Digital Signature Standard. A digital signature algorithm designed by The US National Institute of

Standards and Technology and based on public-key cryptography. DSS does not do user datagram

encryption. DSS is a component in classic crypto, as well as the Redcreek IPSec card, but not in IPSec

implemented in Cisco IOS software.

Dynamic NAT

See NAT and address translation.

Dynamic PAT

Dynamic Port Address Translation. Dynamic PAT lets multiple outbound sessions appear to originate

from a single IP address. With PAT enabled, the security appliance chooses a unique port number from

the PAT IP address for each outbound translation slot (xlate). This feature is valuable when an ISP

cannot allocate enough unique IP addresses for your outbound connections. The global pool addresses

always come first, before a PAT address is used. See also NAT, Static PAT, and xlate.

ECHO

See Ping, ICMP. See also inspection engine.

EGP

Exterior Gateway Protocol. Replaced by BGP. The security appliance does not support EGP. See also

BGP.

EIGRP

Enhanced Interior Gateway Routing Protocol. The security appliance does not support EIGRP.

EMBLEM

Enterprise Management BaseLine Embedded Manageability. A syslog format designed to be

consistent with the Cisco IOS system log format and is more compatible with CiscoWorks

management applications.

encryption

Application of a specific algorithm or cipher to data so as to render the data incomprehensible to those

unauthorized to see the information. See also decryption.

ESMTP

Extended SMTP. Extended version of SMTP that includes additional functionality, such as delivery

notification and session delivery. ESMTP is described in RFC 1869, SMTP Service Extensions.

ESP

Encapsulating Security Payload. An IPSec protocol, ESP provides authentication and encryption

services for establishing a secure tunnel over an insecure network. For more information, refer to

RFCs 2406 and 1827.

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