each network has been assigned a slash-8 prefix and each network in-terface has been assigned a 32-bit IPv4 address. The network administrator who as-signed IP addresses has chosen the same host suffix for both interfaces of a router. For example, the interfaces on router Q have addresses 10.0.0.5 and 20.0.0.5. Although IP allows arbitrary suffixes, choosing the same value for both interfaces makes address-ing easier for humans to remember. Because router R connects directly to networks 20.0.0.0 and 30.0.0.0, it can use direct delivery to send to a host on either of those networks. The router uses ARP (IPv4) or direct mapping (IPv6) to find the physical address of a computer on those net-works. Given a datagram destined for a host on network 40.0.0.0, however, R cannot deliver directly. Instead, R forwards the datagram to router S (address 30.0.0.7). S will then deliver the datagram directly. R can reach address 30.0.0.7 because both R and S attach directly to network 30.0.0.0.

 

Write a route table for router S .