CertiGuide to Network+  9  Glossary

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FQDN

Fully Qualified Domain Name. The complete name for a machine on the Internet. For example, FTP.microsoft.com indicates FTP is the host machine, and Microsoft is the domain in the first level structure, .COM. The second level is the name Microsoft.

The scattering of parts of the same disk file over different areas of the disk. Fragmentation occurs as files on a disk are deleted and new files are added. It slows disk access and degrades the overall performance of disk operations, although usually not severely.

A group of data at the 1^st or 2^nd layer of the OSI model. 2. A fixed-sized data packet in frame relay.

A communication scheme used in Wide Area Networks (WAN) which provides fast packet-switching utilizing digital communications. Frame Relay has replaced X.25, a slower, analog-based packet-switching network.

A logical collection of unused data-storage media that can be used by applications or other media pools. When media are no longer needed by an application, they are returned to a free media pool so that they can be used again.

File Transfer Protocol. Part of the suite of tools and protocols found in TCP/IP. A utility to transfer files, utilizing TCP, a connection-oriented protocol.

Full duplex is the ability to send and receive data, at the same time. Half Duplex (Simplex) is send or receive data at the same time.

A service (www) with a 2^nd level name, (CertiGuide), and a 1^st level domain, (.com)

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