Routing refers to the process of choosing a path over which to send packets. The information used to make routing decisions is known as IP routing information. Routing Software would examine network load, Datagram length or type of service specified in the datagram header when selecting the best path. An internet composed of multiple physical networks interconnected by computers is called routers. Both host and routers participate in routing an IP datagram protocol to its destination. The purpose of routers is to make IP routing decisions. There are two forms of IP routing. Direct delivery and Indirect delivery.
Direct Delivery :
The transmission of IP Datagram from one machine across a single physical network directly to another.
Indirect delivery :
When the destination is not on a directly attached network it forces the sender to pass the IP datagram to a router for delivery.
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