Cisco PIX 525 Specifikace stáhnout pdf (Strana 589)

Glossary

GL-21

Cisco Security Appliance Command Line Configuration Guide

OL-6721-01

VLAN

Virtual LAN. A group of devices on one or more LANs that are configured (using management

software) so that they can communicate as if they were attached to the same physical network cable,

when in fact they are located on a number of different LAN segments. Because VLANs are based on

logical instead of physical connections, they are extremely flexible.

VoIP

Voice over IP. VoIP carries normal voice traffic, such as telephone calls and faxes, over an IP-based

network. DSP segments the voice signal into frames, which then are coupled in groups of two and

stored in voice packets. These voice packets are transported using IP in compliance with ITU-T

specification H.323.

VPN

Virtual Private Network. A network connection between two peers over the public network that is

made private by strict authentication of users and the encryption of all data traffic. You can establish

VPNs between clients, such as PCs, or a headend, such as the security appliance.

virtual firewall

See security context.

VSA

Vendor-specific attribute. An attribute in a RADIUS packet that is defined by a vendor rather than by

RADIUS RFCs. The RADIUS protocol uses IANA-assigned vendor numbers to help identify VSAs.

This lets different vendors have VSAs of the same number. The combination of a vendor number and

a VSA number makes a VSA unique. For example, the cisco-av-pair VSA is attribute 1 in the set of

VSAs related to vendor number 9. Each vendor can define up to 256 VSAs. A RADIUS packet

contains any VSAs attribute 26, named Vendor-specific. VSAs are sometimes referred to as

subattributes.

WAN

wide-area network. Data communications network that serves users across a broad geographic area

and often uses transmission devices provided by common carriers.

Websense

A content filtering solution that manages employee access to the Internet. Websense uses a policy

engine and a URL database to control user access to websites.

WEP

Wired Equivalent Privacy. A security protocol for wireless LANs, defined in the IEEE 802.11b

standard.

WINS

Windows Internet Naming Service. A Windows system that determines the IP address associated with

a particular network device, also known as “name resolution.” WINS uses a distributed database that

is automatically updated with the NetBIOS names of network devices currently available and the IP

address assigned to each one.WINS provides a distributed database for registering and querying

dynamic NetBIOS names to IP address mapping in a routed network environment. It is the best choice

for NetBIOS name resolution in such a routed network because it is designed to solve the problems

that occur with name resolution in complex networks.

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