IBM 8239 Token-Ring Stackable Hub, Руководство по установке и эксплуатации

Страница: 132 / 141

soft error. An intermittent error on a network that
causes data to have to be transmitted more than once
to be received. A soft error does not, by itself, affect the
network's overall reliability. If the number of soft errors
reaches the ring error limit, reliability is affected.
stack. A single 8239 system containing one or more
stack units that are connected using Stack In/Stack Out
connectors.
subnet. (1) In TCP/IP, a part of a network that is
identified by a portion of the IP address. (2) Synonym
for
subnetwork.
subnet address. In Internet communications, an
extension to the basic IP addressing scheme where a
portion of the host address is interpreted as the local
network address.
subnet mask. Synonym for address mask.
subnetwork. (1) Any group of nodes that have a set
of common characteristics, such as the same network
ID. (2) Synonymous with
subnet.
subnetwork mask. Synonym for address mask.
T
Telnet. In the Internet suite of protocols, a protocol
that provides remote terminal connection service. It
allows users of one host to log on to a remote host and
interact as directly attached terminal users of that host.
Transmission Control Protocol (TCP). A
communications protocol used in the Internet and in any
network that follows the U.S. Department of Defense
standards for internetwork protocol. TCP provides a
reliable host-to-host protocol between hosts in
packet-switched communications networks and in
interconnected systems of such networks. It uses the
Internet Protocol (IP) as the underlying protocol.
Transmission Control Protocol/Internet Protocol
(TCP/IP). A set of communications protocols that
support peer-to-peer connectivity functions for both local
and wide area networks.
trap. In the Simple Network Management Protocol
(SNMP), a message sent by a managed node (agent
function) to a management station to report an
exception condition.
Trivial File Transfer Protocol (TFTP). A protocol that
transfers files between hosts using minimal protocol.
U
uniform resource locator (URL). For HTML
documents and for the World Wide Web, a sequence of
characters that represent information resources. This
sequence of characters includes (a) the abbreviated
name of the protocol used to access the information
resource and (b) the information used by the protocol to
locate the information resource.
User Datagram Protocol (UDP). (1) In TCP/IP, a
packet-level protocol built directly on the Internet
Protocol layer. UDP is used for
application-to-application programs between TCP/IP
host systems. (2) The Internet Protocol that enables an
application programmer on one machine or process to
send a datagram to an application program on another
machine or process. UDP uses the internet protocol (IP)
to deliver datagrams.
W
web browser. A client program that allows a user to
navigate the Internet World Wide Web via hypertext
links. These links, called uniform resource locators
(URLs), specify the protocol, location, and file name of
each document. The documents can be text, graphics,
video, or audio.
World Wide Web (WWW). (1) A global, interactive,
dynamic, cross-platform, distributed graphical hypertext
information system that runs over the Internet. (2) An
internation, virtual-network-based information service
composed of internet host computers that provide online
information in a specific hypertext format. (A)
X-4
8239 Setup and User’s Guide