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					Network Routing and Its Rules

A network is an arrangement of devices that have the capability to send digitally encoded messages or
data to others. These devices work in coordination with each other and help a data packet to reach the
destination. This process of sending the data packet from source to destination within the network is
called network routing. The devices that make this routing possible are called as routers. When a data
packet reaches a router, it gets forwarded to the next router which is much closer to the destination.

There are some important decisions that a router must make before forwarding to another router. The
most important decision to be made is which of the next available router will be capable of transmitting
the data packet to the destination more efficiently For this calculation, there are many network routing
protocols are made. These protocols are often categorized under table driven and on demand routing
protocols. In the table driven category, the router has a special table, called routing table installed in it.

The table contains note of all the available routers, and the cost that the network has to pay in order to
reach the router. The cost can be measured in many units. The most common unit is time, while other
units can be congestion, traffic , distance etc. From all the available routers, the next router will be
selected with the least cost. In the On demand protocols, there is no table; the packets are forwarded
according the demand of routers if it is free and ready to send.

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