same as previous level, with only one obstacle is we may have a problem of overlapping ips since the fixed ips are looking alike so we wont have that freedom to choose ips within all the subnet;

its easy to connect H2 to H1 so we’re gonna skip it.

its also easy to connect the two routers so skip it as well.

now to connect the two hosts 3 and 4: the ip of R23 is already given as the gateway of H4 , now we need to choose a mask and ip to work on the host 3 based on the destination we’re gonna put on the route of Internet that will include all the hosts : 160.80.154.0/24

so the best thing is to use a very small subnet to not have an overlap which is 255.255.255.252 and use ips that doesnt interfer with other ranges within our setup like 160.80.154.193/160.80.154.197