ZyXEL Communications Prestige 642R Series - Manual (Page 155)

Prestige 642R Series ADSL Router
Glossary E
Protocol), but it is scaled back in functionality so that it requires fewer resources to run. TFTP
uses the UDP (User Datagram Protocol) rather than TCP (Transmission Control Protocol).
UDP User Datagram Protocol. UDP is a connectionless transport service that dispenses with the
reliability services provided by TCP. UDP gives applications a direct interface with IP and the
ability to address a particular application process running on a host via a port number without
setting up a connection session.
URL Uniform Resource Locator. URL is an object on the Internet or an intranet that resides on a
host system. Objects include directories and an assortment of file types, including text files,
graphics, video, and audio. A URL is the address of an object that is normally typed in the
Address field of a Web browser. The URL is basically a pointer to the location of an object.
VCI Virtual Channel Identifier. Identifies virtual channels between users or between users and
networks.
VPI Virtual Path Identifier. Identifies virtual paths between users or between users and networks.
WAN Wide Area Networks link geographically dispersed offices in other cities or around the globe.
Just about any long-distance communication medium can serve as a WAN link, including
switched and permanent telephone circuits, terrestrial radio systems, and satellite systems.
WWW World Wide Web. Frequently used (incorrectly) when referring to "The Internet", WWW has
two major meanings - First, loosely used: the whole constellation of resources that can be
accessed using Gopher, FTP, HTTP, Telnet, USENET, WAIS and some other tools. Second:
the universe of hypertext servers (HTTP servers).