Cisco PIX 525 Spezifikationen PDF herunterladen (Seite 587)

Glossary

GL-19

Cisco Security Appliance Command Line Configuration Guide

OL-6721-01

Static PAT

Static Port Address Translation. Static PAT is a static address that also maps a local port to a global

port. See also Dynamic PAT, NAT.

subnetmask

See mask.

TACACS+

Terminal Access Controller Access Control System Plus. A client-server protocol that supports AAA

services, including command authorization. See also AAA, RADIUS.

TAPI

Telephony Application Programming Interface. A programming interface in Microsoft Windows that

supports telephony functions.

TCP

Transmission Control Protocol. Connection-oriented transport layer protocol that provides reliable

full-duplex data transmission.

TCP Intercept

With the TCP intercept feature, once the optional embryonic connection limit is reached, and until the

embryonic connection count falls below this threshold, every SYN bound for the effected server is

intercepted. For each SYN, the security appliance responds on behalf of the server with an empty

SYN/ACK segment. The security appliance retains pertinent state information, drops the packet, and

waits for the client acknowledgment. If the ACK is received, then a copy of the client SYN segment

is sent to the server and the TCP three-way handshake is performed between the security appliance

and the server. If this three-way handshake completes, may the connection resume as normal. If the

client does not respond during any part of the connection phase, then the security appliance

retransmits the necessary segment using exponential back-offs.

TDP

Tag Distribution Protocol. TDP is used by tag switching devices to distribute, request, and release tag

binding information for multiple network layer protocols in a tag switching network. TDP does not

replace routing protocols. Instead, it uses information learned from routing protocols to create tag

bindings. TDP is also used to open, monitor, and close TDP sessions and to indicate errors that occur

during those sessions. TDP operates over a connection-oriented transport layer protocol with

guaranteed sequential delivery (such as TCP). The use of TDP does not preclude the use of other

mechanisms to distribute tag binding information, such as piggybacking information on other

protocols.

Telnet

A terminal emulation protocol for TCP/IP networks such as the Internet. Telnet is a common way to

control web servers remotely; however, its security vulnerabilities have led to its replacement by SSH.

TFTP

Trivial File Transfer Protocol. TFTP is a simple protocol used to transfer files. It runs on UDP and is

explained in depth in RFC 1350.

TLS

Transport Layer Security. A future IETF protocol to replace SSL.

traffic policing

The traffic policing feature ensures that no traffic exceeds the maximum rate (bits per second) that you

configure, thus ensuring that no one traffic flow can take over the entire resource.

transform set

See IPSec transform set.

translate,

translation

See xlate.

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