So I did look around and read alot on this but im wondering if I am wrong or if my teacher is wrong. I was asked to subnet and configure a networking containing 2 computers 2 switches and 2 routers, So on each side(this is in packet tracer) it would be computer to switch to router, the repeat for the second one. One network would have 50 computers the other would have 10. So i did that using the ip he provided 172.16.0.0. First network 172.16.0.0-63 (i left out the network and broadcast in my packet tracer). The next network with 10 computers was 172.16.0.64-79 again i left out network and broadcast. Now i come to the Router to Router serial connection using a HWIC-T2. That needs a network! Note: subnet mask for both existing networks at this point is 255.255.0.0. Meaning for both computers both switches and both routers. So then i subneted a network with 4 ip addresses, that was 172.16.0.80-83 leaving me 2 addresses after network and broadcast. I go to interface serial 0/0/0 and type ip address 172.16.0.80 255.255.0.0 that didn't work it said 172.16.0.0 overlaps with gigabitethernet 0/0. I tried everything, changing the subnet mask to something. Im not sure what to do but i was told by my teacher that i would be able to subnet this whole network. Any ideas if im wrong or if he is?
