hi...the network design is...r1(s0)-(s0)r2(s1)-(s1)r3(e0)-(e0)r4r1)!interface Loopback0 ip address 7.7.1.1 255.255.255.0!interface Serial0 ip address 7.7.12.1 255.255.255.0!interface Serial1 no ip address shutdown!router bgp 1 bgp router-id 7.7.1.1 b...