A.route ip172.0.0.0255.0.0.0s0 B.ip route0.0.0.00.0.0.0172.16.20.1 C.ip route0.0.0.0255.255.255.255172.16.20.1 D.route ip0.0.0.0255.255.255.0172.16.10.1150
A.255.255.255.252 B.255.255.255.128 C.255.255.0.0 D.255.255.255.192
A.10.254.255.23 B.10.254.255.24 C.10.254.255.255 D.10.255.255.255