Cisco PIX 525 Dokumentacja Pobierz pdf (Strona 583)

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Glossary

GL-15

Cisco Security Appliance Command Line Configuration Guide

OL-6721-01

protocol, protocol

literals

A standard that defines the exchange of packets between network nodes for communication. Protocols

work together in layers. Protocols are specified in a security appliance configuration as part of

defining a security policy by their literal values or port numbers. Possible security appliance protocol

literal values are ahp, eigrp, esp, gre, icmp, igmp, igrp, ip, ipinip, ipsec, nos, ospf, pcp, snp, tcp, and

udp.

Proxy-ARP

Enables the security appliance to reply to an ARP request for IP addresses in the global pool. See also

ARP.

public key

A public key is one of a pair of keys that are generated by devices involved in public key infrastructure.

Data encrypted with a public key can only be decrypted using the associated private key. When a

private key is used to produce a digital signature, the receiver can use the public key of the sender to

verify that the message was signed by the sender. These characteristics of key pairs provide a scalable

and secure method of authentication over an insecure media, such as the Internet.

QoS

quality of service. Measure of performance for a transmission system that reflects its transmission

quality and service availability.

Registration Authority. An authorized proxy for a CA. RAs can perform certificate enrollment and can

issue CRLs. See also CA, certificate, public key.

RADIUS

Remote Authentication Dial-In User Service. RADIUS is a distributed client/server system that

secures networks against unauthorized access. RFC 2058 and RFC 2059 define the RADIUS protocol

standard. See also AAA and TACACS+.

Refresh

Retrieve the running configuration from the security appliance and update the screen. The icon and

the button perform the same function.

registration

authority

See RA.

replay-detection

A security service where the receiver can reject old or duplicate packets to defeat replay attacks.

Replay attacks rely on the attacker sending out older or duplicate packets to the receiver and the

receiver thinking that the bogus traffic is legitimate. Replay-detection is done by using sequence

numbers combined with authentication, and is a standard feature of IPSec.

RFC

Request for Comments. RFC documents define protocols and standards for communications over the

Internet. RFCs are developed and published by IETF.

RIP

Routing Information Protocol. Interior gateway protocol (IGP) supplied with UNIX BSD systems.

The most common IGP in the Internet. RIP uses hop count as a routing metric.

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