Cisco IPS 7.1 Installation Guide download pdf (Page 400)

Glossary

GL-22

Cisco Intrusion Prevention System Appliance Hardware Installation Guide for IPS 7.1

OL-24002-01

TFTP

Trivial File Transfer Protocol. Simplified version of FTP that lets files be transferred from one

computer to another over a network, usually without the use of client authentication (for example,

username and password).

threat rating

TR. A threat rating is a value between 0 and 100 that represents a numerical decrease of the risk rating

of an attack based on the response action that depicts the threat of an alert on the monitored network.

three-way

handshake

Process whereby two protocol entities synchronize during connection establishment.

threshold

A value, either upper- or lower-bound that defines the maximum/minimum allowable condition before

an alarm is sent.

Time Processor

A processor in the IPS. Processes events stored in a time-slice calendar. Its primary task is to make stale

database entries expire and to calculate time-dependent statistics.

TLS

Transport Layer Security. The protocol used over stream transports to negotiate the identity of peers

and establish encrypted communications.

TNS

Transparent Network Substrate. Provides database applications with a single common interface to all

industry-standard network protocols. With TNS, database applications can connect to other database

applications across networks with different protocols.

topology

Physical arrangement of network nodes and media within an enterprise networking structure.

TPKT

Transport Packet. RFC 1006-defined method of demarking messages in a packet. The protocol uses ISO

transport services on top of TCP.

traceroute

Program available on many systems that traces the path a packet takes to a destination. It is used mostly

to debug routing problems between hosts. A traceroute protocol is also defined in RFC 1393.

traffic analysis

Inference of information from observable characteristics of data flow(s), even when the data is

encrypted or otherwise not directly available. Such characteristics include the identities and locations

of the source(s) and destination(s), and the presence, amount, frequency, and duration of occurrence.

Traffic ICMP engine

Analyzes traffic from nonstandard protocols, such as TFN2K, LOKI, and DDOS.

trap

Message sent by an SNMP agent to an NMS, a console, or a terminal to indicate the occurrence of a

significant event, such as a specifically defined condition or a threshold that was reached.

Trojan engine

Analyzes traffic from nonstandard protocols, such as BO2K and TFN2K.

trunk

Physical and logical connection between two switches across which network traffic travels. A backbone

is composed of a number of trunks.

trusted certificate

Certificate upon which a certificate user relies as being valid without the need for validation testing;

especially a public-key certificate that is used to provide the first public key in a certification path.

trusted key

Public key upon which a user relies; especially a public key that can be used as the first public key in

a certification path.

tune

Adjusting signature parameters to modify an existing signature.

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Cisco IPS 7.1 Installation Guide Page 400

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