conf  t
hostname Lab_B
enable secret cisco
interface fastEthernet 0
ip address 219.17.100.1 255.255.255.0
no shutdown 
exit
interface serial 0
ip address 199.6.13.1 255.255.255.0
clock rate 56000
no shutdown 
exit
interface serial 1
ip address 201.100.11.2 255.255.255.0
no shutdown 
exit
router rip
network 219.17.100.0
network 199.6.13.0
network 201.100.11.0
exit
line con 0
login
password cisco
exit
line vty 0 4
login
password cisco
exit
line aux 0
login
password cisco
exit
ip host Lab_A 192.5.5.1 201.100.11.1 
ip host Lab_B 201.100.11.2 219.17.100.1 199.6.13.1
ip host Lab_C 199.6.13.2 223.8.151.1 204.204.7.1
ip host Lab_D 204.204.7.2 210.93.105.1
ip host Lab_E 210.93.105.2
exit
wr
copy running-config startup-config