1.Router1 does not know about the destination network. So we need to add a route. The next hop for Router1 towards the destination is Router2’s fa0/0 interface. The route can be added using the following command:
2.Router2 also does not know about the destination network. So we need to add a route telling it that the next hop towards 192.168.5.0/24 is Router3’s fa0/0 interface. The following command can be used to add the route:
3.Router3 knows the destination network since it is directly connected to it. So a route need not be added.
Following the path back from the destination to source, which is Router3->Router2->Router1:
1.Router3 does not know the 192.168.1.0/24 network, so a route should be added using the following command:
2.Router2 also does not know the 192.168.1.0/24 network, so a route should be added using the following command:
3.Router1, being directly connected to 192.168.1.0/24, knows about the network already.