Routing is used for taking a packet from one device and sending it through the network to another device on a different network. Routers don’t really care about hosts they only care about networks and the best path to each network. The logical network address of the destination host is used to get packets to a network through a routed network, and then the hardware address of the host is used to deliver the packet from a router to the correct destination host.
If your network has no routers, then it should be apparent that you are not routing. Routers route traffic to all the networks in your internetwork.
To be able to route packets, a router must know, at a minimum, the following:
The router then builds a routing table (a map of the internetwork) that describes how to find the remote networks.
It is used, the administrator is responsible for updating all changes by hand into all routers. Typically, in a large network, a combination of both dynamic and static routing is used.
A protocol on one router communicates with the same protocol running on neighbor routers. The routers then update each other about all the networks they know about and place this information into the routing table. If a change occurs in the network, the dynamic routing protocols automatically inform all routers about the event.
Routing Protocol Basics:-
|Route Source||Default AD|
|Unknown||255 (this route will never be used)|
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