I have an assignment where I need to design a network with 4 subnets and 50 hosts each.
For each of the subnets, I was going to use a 4500 series LAN switch with 2 WS-X4148-RJ cards. Now, if I use a router for each subnet, what router should I use to tie the 4 subnet routers together?
If you are trying to stop the other three subnets talking to your first subnet then can use the following access-list
access-list restrict deny ip 22.214.171.124 0.0.0.63 126.96.36.199 0.0.0.63
access-list restrict deny ip 188.8.131.52 0.0.0.63 184.108.40.206 0.0.0.63
access-list restrict deny ip 220.127.116.11 0.0.0.63 18.104.22.168 0.0.0.63
access-list restrict permit ip any any
then apply access-list to the relevant interface in outbbound direction ie.
ip access-group restrict out
This will stop any traffic from your other three subnets going through to the first subnet and it would still allow your first subnets outbound traffic. Note that this access-list is not stopping your first subnet talking to your other three subnets but the return traffic will be blocked.