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Glossary

GL-20

Cisco Security Appliance Command Line Configuration Guide

OL-6721-01

transparent firewall

mode

A mode in which the security appliance is not a router hop. You can use transparent firewall mode to

simplify your network configuration or to make the security appliance invisible to attackers. You can

also use transparent firewall mode to allow traffic through that would otherwise be blocked in routed

firewall mode. See also routed firewall mode.

transport mode

An IPSec encryption mode that encrypts only the data portion (payload) of each packet, but leaves the

header untouched. Transport mode is less secure than tunnel mode.

TSP

TAPI Service Provider. See also TAPI.

tunnel mode

An IPSec encryption mode that encrypts both the header and data portion (payload) of each packet.

Tunnel mode is more secure than transport mode.

tunnel

A method of transporting data in one protocol by encapsulating it in another protocol. Tunneling is

used for reasons of incompatibility, implementation simplification, or security. For example, a tunnel

lets a remote VPN client have encrypted access to a private network.

Turbo ACL

Increases ACL lookup speeds by compiling them into a set of lookup tables. Packet headers are used

to access the tables in a small, fixed number of lookups, independent of the existing number of ACL

entries.

UDP

User Datagram Protocol. A connectionless transport layer protocol in the IP protocol stack. UDP is a

simple protocol that exchanges datagrams without acknowledgments or guaranteed delivery, which

requires other protocols to handle error processing and retransmission. UDP is defined in RFC 768.

UMTS

Universal Mobile Telecommunication System. An extension of GPRS networks that moves toward an

all-IP network by delivering broadband information, including commerce and entertainment services,

to mobile users via fixed, wireless, and satellite networks

Unicast RPF

Unicast Reverse Path Forwarding. Unicast RPF guards against spoofing by ensuring that packets have

a source IP address that matches the correct source interface according to the routing table.

URL

Uniform Resource Locator. A standardized addressing scheme for accessing hypertext documents and

other services using a browser. For example, http://www.cisco.com.

user EXEC mode

User EXEC mode lets you to see the security appliance settings. The user EXEC mode prompt appears

as follows when you first access the security appliance. See also command-specific configuration

mode, global configuration mode, and privileged EXEC mode.

UTC

Coordinated Universal Time. The time zone at zero degrees longitude, previously called Greenwich

Mean Time (GMT) and Zulu time. UTC replaced GMT in 1967 as the world time standard. UTC is

based on an atomic time scale rather than an astronomical time scale.

UTRAN

Universal Terrestrial Radio Access Network. Networking protocol used for implementing wireless

networks in UMTS. GTP allows multi-protocol packets to be tunneled through a UMTS/GPRS

backbone between a GGSN, an SGSN and the UTRAN.

UUIE

User-User Information Element. An element of an H.225 packet that identifies the users implicated in

the message.

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