Routing

From Mycomputer Notes

A protocol

Is a set of rules that determines how two computers need to communicate with each other accross the network. A protocol is also a common denominator by which the different application, host and systems communicate between each others. When two computers commninicate one with another they exchange data messages (i.e data messages could be a connection to a remote machine, email, data and file transfer) To accept a message and act on this message the computer must have a definition of how the message is defined and what it means.

A protocol describes:

• The format that a message must take.
• The way in which computers must excange a message within the context of a particular activity, such as sending messages across networks.

Routed Protocol

IP is the routed protocol that works on the Internet. IP addressing enables packets to be routed from source to destination using the best available path.

Clarificatoin between Routed/Routable vs Routing protocol.

Routed Protocol

Any network protocol that provides enough information in its network layer address to allow a packet to be forwarded from one host to anohtohter based on the addrssing scheme.Routed protocols uses the routing table to forwarded packets. Examples of Routed Protocols:

1. Internet Protocol (IP)
2. Internetwork Packet Exchange (IPX)
3. AppleTalk

Routing Protocol

Supports a routed protocol by providing mechanisms for sharing routing information. Routing protocol messages move between the routers. A routing protocol allows the routers to communicate with other routers to update and maintain tables. Examples of TCP/IP examples of routing protocols:

1. Routing Infomation Protocol (RIP)
2. Interior Gateway Routing Protocol (IGRP)
3. Enhanced Interior Gateway Routing Protocol (IGRP)
4. Open Shortest Path First (OSPF)