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Glossary 175

P0910464 Issue 01 Enterprise Edge Networking Operations Guide

RIP The Routing Information Protocol (RIP) enables routers in the same

autonomous system to exchange routing information by means of

periodic updates. RIP is a widely-used protocol for managing routing

information within a self-contained network such as a corporate local

area network (LAN) or an interconnected group of such LANs.

Using RIP, a gateway host (with a router) sends its entire routing table

(which lists all the other hosts is has on record) to its closest neighbor

host every 30 seconds. The neighbor host passes the information to its

next neighbor and so on until all hosts within the network have the

same routing path information, a state known as network

convergence. RIP uses a hop count as a way to determine network

distance. Each host with a router in the network uses the routing table

information to determine the next host to route a packet to for a

specified destination.

RIP is considered an effective solution for small homogeneous

networks. For larger, more complicated networks, RIP's transmission

of the entire routing table every 30 seconds may put a heavy amount

of extra traffic in the network.

The major alternative to RIP is the Open Shortest Path First Protocol

(OSPF).

SNMP The Simple Network Management Protocol (SNMP) is the protocol

governing network management and the monitoring of network

devices and their functions.

subnet mask A value used to route packets on TCP/IP networks. When the IP layer

has to deliver a packet through an interface, it uses the destination

address contained in the packet, together with the subnet mask of the

interface to select an interface, and the next hop in that subnet.

synchronous A synchronous signal is sourced from the same timing reference. A

synchronous signal causes the interval between successive bits,

characters, or events to remain constant or locked in to a specific

clock frequency.

TAPI The Telephony Application Program Interface (TAPI) is a standard

program interface that lets you and your computer communicate over

telephones or video phones to people or phone-connected resources

elsewhere in the world.

TCP The Transmission Control Protocol is the major transport protocol in

the Internet suite of protocols providing reliable, connection-oriented,

full-duplex streams.

TCP/IP The Transmission Control Protocol/Internet Protocol (TCP/IP) is a set

of networking protocols designed to link computers from multiple

vendors.

Telnet Telnet is a service that provides terminal-emulation capabilities for

logging into the Enterprise Edge unit from a remote location.

Token-Ring A token-ring is a network topology and data signaling scheme where

a special data packet (called a token) is passed from one station to

another along an electrical ring. A transmitting station takes

possession of the token, transmits the data, then frees the token after

the data has made a complete circuit of the electrical ring.

TOS The type of service (TOS) field is located in the IP packet header and

is used in DifServ processing.

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Avaya EE Networking Guida Utente Pagina 175

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