Instruction manual

NetVanta 2000 Series System Manual Glossary

caching frequently requested web pages and can filter unauthorized user requests for access to files

or designated web sites.

Replay attack

Capturing and storing a password-included packet and then reissuing that packet in an attempt to

gain unauthorized access.

Routing Information Protocol

A protocol for exchanging routing information among gateways and other hosts.

Security Associations

Agreements or negotiations between two or more communicating parties. The details of these

agreements involve decisions on which keys and algorithms are going to be used, and when these

security elements are going to be changed.

Security Parameter Index (SPI)

An arbitrary 32-bit value that is assigned to an SA when it is first created. The SPI, when

combined with the destination IP address and security protocol (AH or ESP), uniquely identifies

the SA.

Source Routing

Source routing is a strict method of routing datagrams that uses a 32-bit header that embeds a

source address, a destination address, a type of service, and other constants and variables that

combine to protect the datagram from incorrect or failed routing.

SYN Flooding

Typically most systems process a queue of about 10 connections attempts (SYNs) at a time. A

malicious intruder who fabricates connection attempts and tries to “flood” a system is using a

denial of service attack known as SYN flooding.

Traffic Shaping

Is a process of minimizing the congestion of a stream of traffic at every connection, physical or

virtual. The net effect is to optimize the overall result.

Virtual Private Network (VPN)

Is a private connection that sends private data traffic over the Internet. This lets organizations

extend network service over the Internet to branch offices and remote users creating a private

WAN (Wide Area Network).