A.172.16.16.0 B.172.16.24.0 C.172.16.0.0 D.172.16.28.0
A.192.168.252.8 255.255.255.248 B.192.168.252.8 255.255.255.252 C.192.168.252.16 255.255.255.240 D.192.168.252.0 255.255.255.252 E.192.168.252.16 255.255.255.252
A.Router(config)#password-encryption B.Router(config)#service password-encryption C.Router#service password-encryption D.Router# password-encryption