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Universal Serial Bus (USB)
USB is an external bus that can transfer up to 12 Mbps. Up to 127 peripheral devices can be connected to a single USB port.
UNIX-to-UNIX Copy Program (UUCP)
UUCP is a protocol used for communication between consenting UNIX systems.
unroutable protocol
An unroutable protocol is a network protocol that does not support routing at OSI Layer 3, such as NetBIOS or DEC-LAT. This type of protocol does not create packets, thus Layer 3 devices, such as routers, cannot be used.
Unshielded Twisted pair (UTP)
UTP is the most common type of network cabling, and is used extensively in telephone networks and many data communications applications. UTP is available in several grades, or categories, of increasing quality. See category 5.
User Datagram Protocol (UDP)
UDP is a Transport Layer protocol (an alternative to TCP) that provides a simple, connectionless datagram delivery service, without error checking, for certain specialized application services that do not require the full services of TCP.
virtual circuit
A virtual circuit is a communication path that appears to be a single circuit to the sending and receiving devices, even though the data may take varying routes between the source and destination nodes.
virtual private network (VPN)
VPNs use end-to-end network encryption to establish a secure connection from machine to machine. Each VPN is an encrypted data stream that travels over a public network, such as the Internet.
virus
A virus is a self-replicating, malicious program that spreads by attaching itself to a file. Viruses can spread quickly through a network, with effects that range from mildly irritating to highly destructive.
World Wide Web (Web)
The Web is the global collection of HTML documents (Web pages) made available for public access by means of the Internet. To retrieve Web pages, a user must have a browser application.
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