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Table Of Contents  CertiGuide to Network+
 9  Glossary

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(Page 1 of 8) Package

An icon that represents embedded or linked information. That information can consist of a complete file, such as a Paint bitmap, or part of a file, such as a spreadsheet cell. When a package is chosen, the application used to create the object either plays the object (if it is a sound file, for example) or opens and displays the object. If the original information is changed, linked information is then updated. However, embedded information needs to be manually updated. In Systems Management Server, an object that contains the files and instructions for distributing software to a distribution point.

Packet

A transmission unit of fixed maximum size that consists of binary information. This information represents both data and a header containing an ID number, source and destination addresses, and error-control data.

Packet assembler/disassembler (PAD)

A connection used in X.25 networks. X.25 PAD boards can be used in place of modems when provided with a compatible COM driver.

Packet switching

Data transfer without regard to path. X.25 and many LAN protocols use packet switching.

Page fault

An error that occurs when the requested code or data cannot be located in the physical memory that is available to the requesting process.

Page-description language (PDL)

A computer language that describes the arrangement of text and graphics on a printed page.

Paging

The process of moving virtual memory back and forth between physical memory and the disk. Paging occurs when physical memory limitations are reached and only occurs for data that is not already “backed” by disk space. For example, file data is not paged out because it already has allocated disk space within a file system.

paging file

A hidden file on the hard disk that Windows 2000 uses to hold parts of programs and data files that do not fit in memory. The paging file and physical memory, or RAM, comprise virtual memory. Windows 2000 moves data from the paging file to memory as needed and moves data from memory to the paging file to make room for new data. Also called a swap file.

Parallel connection

A connection that simultaneously transmits both data and control bits over wires connected in parallel. In general, a parallel connection can move data between devices faster than a serial connection.

Parallel device

A device that uses a parallel connection.

Parallel ports

The input/output connector for a parallel interface device. Printers are generally plugged into a parallel port.


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