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Table Of Contents  CertiGuide to Network+
 9  Glossary

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(Page 1 of 4) UART

Universal Asynchronous Receiver/Transmitter. A ‘workhorse’ IC used in serial communications.

UDP (User Datagram Protocol)

Less overhead than TCP, no specific route for data. No promise of delivery.

Unallocated space

Available disk space that is not allocated to any partition, logical drive, or volume. The type of object created on unallocated space depends on the disk type (basic or dynamic). For basic disks, unallocated space outside partitions can be used to create primary or extended partitions. Free space inside an extended partition can be used to create a logical drive. For dynamic disks, unallocated space can be used to create dynamic volumes. Unlike basic disks, the exact disk region used is not selected to create the volume.

Unicode

A fixed-width, 16-bit character-encoding standard capable of representing the letters and characters of the majority of the world’s languages. A consortium of U.S. computer companies developed Unicode.

UniDriver

The UniDriver (or Universal Print Driver) carries out requests (such as printing text, rendering bitmaps, or advancing a page) on most types of printers. The UniDriver accepts information from a printer specific minidriver and uses this information to complete tasks.

Uniform Resource Locator (URL)

An address that uniquely identifies a location on the Internet. A URL for a World Wide Web site is preceded with http://, as in the fictitious URL http://www.example.microsoft.com/. A URL can contain more detail, such as the name of a page of hypertext, usually identified by the file name extension .html or .htm.

Universal Asynchronous Receiver/Transmitter (UART)

An integrated circuit (silicon chip) that is commonly used in microcomputers to provide asynchronous communications. The UART does parallel-to-serial conversion of data to be transmitted and serial-to-parallel conversion of data received.


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