a)Configure the IP addresses as:

- Host A: 10.1.1.1/24. Gateway: 10.1.1.3

- Host B: 10.1.1.2/24. Gateway: 10.1.1.3

- R1s G0/0: 10.1.1.3/24

- Host C: 10.3.3.3/25. Gateway: 10.3.3.1

- R1s G0/1: 10.3.3.1/25

- S1: 10.2.2.1/24. Gateway: 10.2.2.3

- S2: 10.2.2.2/24. Gateway: 10.2.2.3

- R2s G0/0: 10.2.2.3/24

- R1s S0/3/0: 10.4.4.1/30

- R2s S0/3/0: 10.4.4.2/30

Check that you can ping between hosts in the same subnet:

- From Host A to Host B.

- From Host C to R1s G0/1 interface.

- From S1 to S2.

- From R1s S0/3/0 interface to R2s S0/3/0 interface.

Note that you cant ping between hosts in different subnets because the routers dont have any entry in their routing table.

b)- Enable OSPF/RIP in all interfaces both R1 and R2 (area 0) with only one subcommand in the OSPF/RIP configuration.

Check that the neighboring relationships have been created between R1 and R2.

Check that, after configuring OSPF/RIP, you can ping between hosts in different subnets.

- From Host A to Host C.

- From Host C to S1.

- From Host A to S1.