Cisco 7604 Configuration Guide - Page 707

Glossary DN DNS DoS DSL DSP DSS Dynamic NAT Dynamic PAT Distinguished Name. Global, authoritative name of an entry in the OSI Directory (X.500). Domain Name System (or Service). An Internet service that translates domain names into IP addresses. Denial of Service. A type of network attack in which the goal is to render a network service unavailable. 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. digital signal processor. A DSP segments a voice signal into frames and stores them in voice packets. 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. See NAT and address translation. Dynamic Port Address Translation. Dynamic PAT lets multiple outbound sessions appear to originate from a single IP address. With PAT enabled, the FWSM 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. E ECHO EGP EIGRP EMBLEM encryption EPM ESMTP ESP See Ping, ICMP. See also inspection engine. Exterior Gateway Protocol. Replaced by BGP. The FWSM does not support EGP. See also BGP. Enhanced Interior Gateway Routing Protocol. The FWSM does not support EIGRP. 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. 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. Endpoint Mapper. 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. 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. OL-20748-01 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM GL-5