Cisco PIX 525 Dokumentacja Pobierz pdf (Strona 584)

Glossary

GL-16

Cisco Security Appliance Command Line Configuration Guide

OL-6721-01

RLLA

Reserved Link Local Address. Multicast addresses range from 224.0.0.0 to 239.255.255.255, however

only the range 224.0.1.0 to 239.255.255.255 is available to us. The first part of the multicast address

range, 224.0.0.0 to 224.0.0.255, is reserved and referred to as the RLLA. These addresses are

unavailable. We can exclude the RLLA range by specifying: 224.0.1.0 to 239.255.255.255. 224.0.0.0

to 239.255.255.255 excluding 224.0.0.0 to 224.0.0.255. This is the same as specifying: 224.0.1.0 to

239.255.255.255.

route, routing

The path through a network.

routed firewall

mode

In routed firewall mode, the security appliance is counted as a router hop in the network. It performs

NAT between connected networks and can use OSPF or RIP. See also transparent firewall mode.

RPC

Remote Procedure Call. RPCs are procedure calls that are built or specified by clients and executed

on servers, with the results returned over the network to the clients.

RSA

A public key cryptographic algorithm (named after its inventors, Rivest, Shamir, and Adelman) with

a variable key length. The main weakness of RSA is that it is significantly slow to compute compared

to popular secret-key algorithms, such as DES. The Cisco implementation of IKE uses a

Diffie-Hellman exchange to get the secret keys. This exchange can be authenticated with RSA (or

preshared keys). With the Diffie-Hellman exchange, the DES key never crosses the network (not even

in encrypted form), which is not the case with the RSA encrypt and sign technique. RSA is not public

domain, and must be licensed from RSA Data Security.

RSH

Remote Shell. A protocol that allows a user to execute commands on a remote system without having

to log in to the system. For example, RSH can be used to remotely examine the status of a number of

access servers without connecting to each communication server, executing the command, and then

disconnecting from the communication server.

RTCP

RTP Control Protocol. Protocol that monitors the QoS of an IPv6 RTP connection and conveys

information about the on-going session. See also RTP.

RTP

Real-Time Transport Protocol. Commonly used with IP networks. RTP is designed to provide

end-to-end network transport functions for applications transmitting real-time data, such as audio,

video, or simulation data, over multicast or unicast network services. RTP provides such services as

payload type identification, sequence numbering, timestamping, and delivery monitoring to real-time

applications.

RTSP

Real Time Streaming Protocol. Enables the controlled delivery of real-time data, such as audio and

video. RTSP is designed to work with established protocols, such as RTP and HTTP.

rule

Conditional statements added to the security appliance configuration to define security policy for a

particular situation. See also ACE, ACL, NAT.

running

configuration

The configuration currently running in RAM on the security appliance. The configuration that

determines the operational characteristics of the security appliance.

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