User Manual

P380 Users guide
44
Topology A network topology shows the computers and the links between them. A
network layer must know the current network topology to be able to route packets to their
final destination.
U
UDP User Datagram Protocol. A transport layer protocol in the TCP/IP suite of
protocols. UDP, like TCP, uses IP for delivery; however, unlike TCP, UDP provides for
exchange of datagrams without acknowledgements or guaranteed delivery.
URL Uniform Resource Locator. A standard format for specifying the name, type and
location of documents and resources on an Internet. The syntax is
type://host.domain[:port]/path/filename, where type specifies the type of document or
resource (e.g. http is a file on a WWW server; file is a file on an anonymous FTP server;
telnet is a connection to a Telnet-based service). See WWW.
W
WAN Wide Area Network. Any physical network technology that spans large geographic
distances. WANs usually operate a slower speeds than LANs. See LAN.
WWW World Wide Web. A hypertext-based, distributed information system based on
client - server architecture. Web browsers (client applications) request documents from
Web servers. Documents may contain text, graphics and audiovisual data, as well as links
to other documents and services. Web servers and documents are identified by URLs
(Uniform Resource Locators). See URL.