Netopia R2121 - Manual (Page 270)

6 User’s Reference Guide
remapping: See network number remapping.
RFC (Request for Comment): A series of documents used to exchange information and standards about the
Internet.
RIP (Routing Information Protocol): A protocol used for the transmission of IP routing information.
RJ-11: A telephone-industr y standard connector type, usually containing four pins.
RJ-45: A telephone-industr y standard connector type usually containing eight pins.
router: A device that suppor ts network communications. A router can connect identical network types, such as
LocalTalk-to-LocalTalk, or dissimilar network types, such as LocalTalk-to-Ethernet. However—unless a gateway is
available—a common protocol, such as TCP/IP, must be used over both networks. Routers may be equipped to
provide WAN line suppor t to the LAN devices they ser ve. They may also provide various management and
monitoring functions as well as a variety of configuration capabilities.
router port: A physical or logical connection between a router and a network. Where a network only allows the
use of one protocol, each physical connection corresponds to one logical router por t. An example is the Netopia
ISDN Router’s LocalTalk por t. Where a network allows the use of several protocols, each physical connection
may correspond to several logical router por ts—one for each protocol used. Each router por t has its own
network address.
routing table: A list of networks maintained by each router on an internet. Information in the routing table
helps the router determine the next router to for ward packets to.
seeding: A method for ensuring that two or more routers agree about which physical networks correspond to
which network numbers and zone names. There are three options: non-seeding, soft seeding, and hard seeding.
Seeding can often be set separately for each router por t. See
also hard seeding, non-seeding, seed router, and
soft seeding.
seed router: A router that provides network number and zone information to any router that star ts up on the
same network. See also
hard seeding, non-seeding, seeding, and soft seeding.
serial port: A connector on the back of the workstation through which data flows to and from a serial device.
server: A device or system that has been specifically configured to provide a ser vice, usually to a group of
clients.
SNMP (Simple Network Management Protocol): A protocol used for communication between management
consoles and network devices. The Netopia ISDN Router can be managed through SNMP.
soft seeding: A router setting. In soft seeding, if a router that has just been reset detects a network number or
zone name conflict between its configured information for a par ticular por t and the information provided by
another router connected to that por t, it updates its configuration using the information provided by the other
router. See
also hard seeding, non-seeding, seeding, and seed router.
subnet: A network address created by using a subnet mask to specify that a number of bits in an internet
address will be used as a subnet number rather than a host address.
subnet mask: A 32-bit number to specify which par t of an internet address is the network number, and which
par t is the host address. When written in binar y notation, each bit written as 1 corresponds to 1 bit of network
address information. One subnet mask applies to all IP devices on an individual IP network.
SDLC (Synchronous Data Link Control): A link-level communications protocol used in an International
Business Machines (IBM) Systems Network Architecture (SNA) network that manages synchronous,
code-transparent, serial information transfer over a link connection. SDLC is a subset of the more generic HDLC
(High-Level Data Link Control) protocol developed by the International Organization for Standardization (ISO).