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Glossary
EN/LZT 108 6492 R2 - October 2003
125
the circuit is preprogrammed by the carrier as a path through the network. It
does not need to be set up or disconnected for each session.
- R -
Remote
In a physically separate location. For example, an employee away on travel
who logs in to the company’s intranet is a remote user.
RFC
Short for Request For Comments, a series of notes about the Internet,
started in 1969 (when the Internet was the ARPANET). An Internet
Document can be submitted to the IETF by anyone, but the IETF decides if
the document becomes an RFC. Eventually, if it gains enough interest, it
may evolve into an Internet standard. Each RFC is designated by an RFC
number. Once published, an RFC never changes. Modifications to an
original RFC are assigned a new RFC number.
RIP
Short for Routing Information Protocol, which is a protocol that specifies
how routers exchange routing table information. With RIP, routers
periodically exchange entire tables. There are two versions of RIP; version
1 and version II.
Routing
Forwarding data between your network and the Internet on the most
efficient route, based on the data’s destination IP address and current
network conditions. A device that performs routing is called a router.
- S -
SDNS
Short for Secondary Domain Name System (Server). A DNS server that
can be used if the primary DNS server is not available. See also DNS.
SNMP
Short for Simple Network Management Protocol, a set of protocols for
managing complex networks. SNMP works by sending messages, called
protocol data units (PDUs), to different parts of a network. SNMP-compliant
devices, called agents, store data about themselves in Management
Information Bases (MIBs) and return this data to the SNMP requesters.
Subnet
A subnet is a portion of a network. The subnet is distinguished from the
larger network by a subnet mask which selects some of the computers of
the network and excludes all others. The subnet’s computers remain
physically connected to the rest of the parent network, but they are treated
as though they were on a separate network.