· In order to deliver the packet by choosing an optimal path from one network to another.

Routing Protocol

Exterior Gateway Protocol: (EGP)

Exterior Gateway Protocol (EGP) is a Routing Protocol which is used to find network path information between different Autonomous Systems.

Interior gateway protocol: (IGP)

An interior gateway protocol (IGP) is a type of protocol used for exchanging routing information between routers within an autonomous system

Two main types of Routing:

1. Static routing

2. Dynamic routing

Static routing:

Static routing is a process in which we have to manually add routes in routing table.

Administrative distance: 1

Disadvantage:

For a large network, it is a Complex task for administrator to manually add each route for the network in the routing table on each router.
A failure occurs between two statically defined devices, traffic will not be re-routed

Dynamic Routing:

Dynamic routing enables routers to select paths according to real-time logical network layout changes.

In dynamic routing, the routing protocol operating on the router is responsible for the creation, maintenance and updating of the dynamic routing table