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of Service (QoS) A phrase describing how overall transmission
quality, speed, and reliability improve as data transmission,
error, and missing data packet rates are measured and then
modified to eliminate problems.
Queue A line or list formed by items waiting for service,
such as tasks waiting to be performed, stations waiting for
connection, or messages waiting for transmission.
RADIUS (Remote Access DIalup User Service) An Internet-standard
protocol (defined in RFC 2058) that carries a remote user's
authentication and configuration information between a network
access server and the company's designated authentication
server; the authentication server contains a database that
stores remote user account information.
Remote LAN Access The process of allowing branch offices,
telecommuters, and traveling computer users to access the
corporate LAN backbone over dedicated or dialed, digital or
Realtime Blackhole List (RBL) A list containing the server
IP addresses of ISPs whose customers send and perpetuate Unsolicited
Bulk E-mail (UBE).
Remote management A management feature that uses bandwidth
between sites over the management sub-channel established
by the AIM (Ascend Inverse Multiplexing) protocol. Any Ascend
unit can control, configure, and obtain statistical and diagnostic
information about any other Ascend unit; multi-level security
assures that unauthorized personnel do not have access to
remote management functions.
Real Time Streaming Protocol (RTSP) A proposed standard for
controlling streaming data over the Web. RTSP is designed
to efficiently broadcast audio-visual data to large groups.
Registered Jack-45 (RJ-45) An eight-wire connector commonly
used to connect a computer onto a LAN, particularly an Ethernet
RIP (Routing Information Protocol) Routing information protocol
teaches routers on a wide area network which routers have
access to which addresses. This information is kept in a routing
table on each router. As routers communicate with each other,
they all update their routing tables to include each others'
routing table information. In a large network environment,
this exchange of information can keep the network connections
up unnecessarily, and can result in very large routing tables
on each router. You can apply a call filter to ignore RIP
updates. You can also control how route information is propagated.
Router An interconnection device that can connect individual
LANs. Unlike bridges, which logically connect at OSI Layer
2, routers provide logical paths at OSI Layer 3. Like bridges,
remote sites can be connected using routers over dedicated
or switched lines to create WANs.
Remote monitoring (RMON) A network management protocol that
is used to gather network information from a single workstation.
Request for Comments (RFC) A series of numbered international
documents that set standards which are voluntarily followed
by many makers of software in the Internet community. Once
an RFC becomes a standard, it cannot be modified or deleted.
An RFC can be updated by a subsequent RFC with a new number.
Routing A device or setup that finds the best route between
any two networks even if there are several networks to traverse.
Reverse caching The process of configuring the HTTP proxy
to store files that reside on a Web server in the proxy's
Routing table A list of destinations known to the router.
Routing tables are built and used based on three protocols:
RIP: Which continuously broadcasts routing updates
every 30 seconds
ICMP: Which can dynamically redirect packets to a more
ARP: Which enables the Pipeline to respond to address
queries with its own physical address
Rubber Bandwidth A term used to describe a communications
channel whose bandwidth can be increased or decreased without
terminating and re-establishing the channel. Typically used
with inverse multiplexing.
RS-232 A set of EIA standards specifying various electrical
and mechanical characteristics for interfaces between DTE
and DCE data communications devices.