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Glossary: CCNA & General Networking Terms 

 

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X
X is the name for TCP/IP based network-oriented window systems. Network window systems allow a program to use a display on a different computer. The most widely-implemented window system is X11 - a component of MIT's Project Athena. [Source: RFC1392]
X.21
An interface for synchronous operation on public data networks, a successor for V.24 and V.25 definitions, from ITU-T. Data rates can be up to 2Mbits/s.
X.25
A data communications interface specification developed to describe how data passes into and out of public data communications networks. The CCITT and ISO approved protocol suite defines protocol layers 1 through 3. [Source: RFC1392]
X.29
a protocol defining the control packet format between the PAD and remote host regarding the virtual terminal parameters (the X3 parameters) and changes in their values. X29 uses packets defined by X25.
X.400
The CCITT and ISO standard for electronic mail. It is widely used in Europe and Canada. See also: MHS. [Source: RFC1392]
X.500
The CCITT and ISO standard for electronic directory services. See also: DSA, white pages, Knowbot, WHOIS. [Source: RFC1392]
XDR
See: eXternal Data Representation
XDSL
A Digital Subscriber Line similar to ISDN.
Xerox Network System (XNS)
A network developed by Xerox corporation. Implementations exist for both 4.3BSD derived systems, as well as the Xerox Star computers. [Source: RFC1392]
XHTML
Extensible Hypertext Markup Language.
XML
See: Extendable Markup Language.
XNS
See: Xerox Network System
X/Open
A group of computer manufacturers that promotes the development of portable applications based on UNIX. They publish a document called the X/Open Portability Guide.
X Recommendations
The CCITT documents that describe data communication network standards. Well-known ones include:- X.25 Packet Switching standard, X.400 Message Handling System, and X.500 Directory Services.

 

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