Question

Where does a host send packets to if the destination is on the same subnet? What does the host do if the destination is on a different subnet?

Answer 1

Where does a host send packets to if the destination is on the same subnet?
What does the host do if the destination is on a different subnet?
This is sorted out by routing protocol, the subnet and mask will tell network stack what range of IP's are local to host,for local IP's it directly sends packets to it,
for non-local Ip, they will sent to router(gateway), and the gateways are defined in the network configurations,the decision is made by the router where to forward the packets,so the correct one is chosed and packets are send to it