ProCurve 800, Руководство по настройке

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A-23
Appendix A: Glossary
The other type of Trojan is a standalone program that masquerades as some-
thing else, such as program that claims to rid your hard drive of viruses but in
fact inserts them.
U
UDP User Datagram Protocol . A stateless protocol that is part of the IP protocol
suite. Using UDP, programs on network computers can send datagrams to one
another. UDP does not provide the reliability and ordering guarantees that
TCP
does; datagrams may arrive out of order or go missing without notice. How-
ever, UDP is faster and more efficient for many lightweight or time-sensitive
programs. For more information, see RFC 768 at
http://www.ietf.org/rfc/
rfc0768.txt .
USB Universal Serial Bus . A serial bus standard for interface devices. It was
designed for computers, but its popularity has made it commonplace on video
game consoles, PDAs, cell phones, MP3 players, portable memory devices,
and even on televisions and home stereo equipment
unmanaged
endpoint
A device that is not under the company’s administrative control. Examples
include a guest’s computer or a contractor’s computer. Such a device is still
subject to the company’s network security policies.
untestable
endpoint
A device that is running an operating system that the NAC 800 does not
currently support or whose Internet Explorer security setting is “High.”
user role NAC 800 management permissions that are granted to end-users. Four pre-
defined roles are included with the NAC 800: See Table 3-1 for predefined user
roles. New user roles can also be created.
V
VI A display-oriented interactive text editor that was created for Unix systems.
For more information, see the original document at
http://webauth.stan-
ford.edu/protocol.html
.
virus A computer program that can copy itself and damage a computer system. A
virus cannot self-propagate as a
worm can but is spread via infected removable
media (floppy disks, zip drives, USB drives) or by sending it over a network.
Viruses can be programmed to do all kinds of damage, such as erasing hard
drives, deleting files, or corrupting executables, or they can be relatively
benign (showing text or a graphic), but even the benign viruses use up