- hacker
- A person who delights in
having an intimate understanding of the internal
workings of a system, computers and computer networks
in particular. The term is often misused in a
pejorative context, where "cracker" would be
the correct term. See also: cracker. [Source: RFC1392]
- HDLC
- High level Data Link
Control, ISO standard for carrying data over a link
with error and flow control.
- header
- The portion of a packet,
preceding the actual data, containing source and
destination addresses, and error checking and other
fields. A header is also the part of an electronic
mail message that precedes the body of a message and
contains, among other things, the message originator,
date and time. See also: Electronic Mail, packet,
error checking. [Source: RFC1392]
- heterogeneous network
- A network running
multiple network layer protocols. See also: DECnet,
IP, IPX, XNS, homogeneous network. [Source: RFC1983]
- hierarchical routing
- The complex problem of
routing on large networks can be simplified by
reducing the size of the networks. This is
accomplished by breaking a network into a hierarchy of
networks, where each level is responsible for its own
routing. The Internet has, basically, three levels:
the backbones, the mid-levels, and the stub networks.
The backbones know how to route between the
mid-levels, the mid-levels know how to route between
the sites, and each site (being an autonomous system)
knows how to route internally. See also: Autonomous
System, Exterior Gateway Protocol, Interior Gateway
Protocol, stub network, transit network. [Source:
RFC1392]
- High Performance
Computing and Communications (HPCC)
- High performance
computing encompasses advanced computing,
communications, and information technologies,
including scientific workstations, supercomputer
systems, high speed networks, special purpose and
experimental systems, the new generation of large
scale parallel systems, and application and systems
software with all components well integrated and
linked over a high speed network. [Source: HPCC]
- High Performance
Parallel Interface (HIPPI)
- An emerging ANSI
standard which extends the computer bus over fairly
short distances at speeds of 800 and 1600 Mb/s. HIPPI
is often used in a computer room to connect a
supercomputer to routers, frame buffers, mass-storage
peripherals, and other computers. See also: American
National Standards Institute [Source: MALAMUD]
- HIPERLAN
- High Performance radio
Local Area Network, an ESTI standard EN 300 652 for
high speed data communications at 20Mbit/s in the 5GHz
range, either between portable devices or as an
extension of a wired network infrastructure. There is
a development to produce HIPERLAN2, which can be used
for 3G mobile phone core networks as well as 54Mbit/s
data networks in the 5GHz radio range. See also
802.11, Wireless Local Area Network.
- HIPPI
- See: High Performance
Parallel Interface
- homogeneous network
- A network running a
single network layer protocol. See also: DECnet, IP,
IPX, XNS, heterogeneous network. [Source: RFC1983]
- hop
- A term used in routing.
A path to a destination on a network is a series of
hops, through routers, away from the origin. [Source:
RFC1392]
- host
- A computer that allows
users to communicate with other host computers on a
network. Individual users communicate by using
application programs, such as electronic mail, Telnet
and FTP. [Source: NNSC]
- host address
- See: internet address
- hostname
- The name given to a
machine. See also: Fully Qualified Domain Name.
[Source: ZEN]
- host number
- See: host address
- HPCC
- See: High Performance
Computing and Communications
- HTML
- See: Hypertext Markup
Language
- HTTP
- See: Hypertext Transfer
Protocol
- hub
- A device connected to
several other devices. In ARCnet, a hub is used to
connect several computers together. In a message
handling service, a hub is used for the transfer of
messages across the network. [Source: MALAMUD]
- hyperlink
- A pointer within a
hypertext document which points (links) to another
document, which may or may not also be a hypertext
document. See also: hypertext. [Source: RFC1983]
- hypertext
- A document, written in
HTML, which contains hyperlinks to other documents,
which may or may not also be hypertext documents.
Hypertext documents are usually retrieved using WWW.
See also: hyperlink, Hypertext Markup Language, World
Wide Web. [Source: RFC1983]
- Hypertext Markup
Language (HTML)
- The language used to
create hypertext documents. It is a subset of SGML and
includes the mechanisms to establish hyperlinks to
other documents. See also: hypertext, hyperlink,
Standardized General Markup Language. [Source:
RFC1983]
- Hypertext Markup
Protocol (HTTP)
- The protocol used by WWW
to transfer HTML files. A formal standard is still
under development in the IETF. See also: hyperlink,
hypertext, Hypertext Markup Language, World Wide Web.
[Source: RFC1983]
Return
to TOP
|
