Config

R3#sh running-config
Building configuration...

Current configuration : 973 bytes
!
version 12.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname R3
!
!
!
enable secret 5 $1$mERr$NJdjwh5wX8Ia/X8aC4RIu.
!
!
!
!
!
!
no ip cef
no ipv6 cef
!
!
!
!
!
!
!
!
!
!
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface Loopback10
 ip address 10.10.10.3 255.255.255.128
!
interface Loopback20
 ip address 10.20.20.3 255.255.255.240
!
interface Loopback30
 ip address 10.30.30.3 255.255.255.248
!
interface FastEthernet0/0
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface FastEthernet0/1
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface Serial0/1/0
 ip address 172.16.1.2 255.255.255.192
!
interface Serial0/1/1
 no ip address
 clock rate 2000000
 shutdown
!
interface Vlan1
 no ip address
 shutdown
!
ip classless
ip route 0.0.0.0 0.0.0.0 Serial0/1/0
!
ip flow-export version 9
!
!
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
 password CISCO
 login
!
!
!
end

____________________________________________________________________________________

R1#sh running-config
Building configuration...

Current configuration : 1068 bytes
!
version 12.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname R1
!
!
!
enable secret 5 $1$mERr$NJdjwh5wX8Ia/X8aC4RIu.
!
!
!
!
!
!
no ip cef
no ipv6 cef
!
!
!
!
!
!
!
!
!
!
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface FastEthernet0/0
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface FastEthernet0/1
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface Serial0/1/0
 ip address 172.16.1.1 255.255.255.192
 ip access-group 150 in
 clock rate 800000
!
interface Serial0/1/1
 no ip address
 clock rate 2000000
 shutdown
!
interface Vlan1
 no ip address
 shutdown
!
ip classless
ip route 0.0.0.0 0.0.0.0 Serial0/1/0
!
ip flow-export version 9
!
!
access-list 150 permit tcp 10.10.10.0 0.0.0.127 any eq telnet
access-list 150 permit tcp 10.30.30.0 0.0.0.7 any eq telnet
access-list 150 deny tcp 10.20.20.0 0.0.0.15 any eq telnet
access-list 150 permit icmp 10.20.20.0 0.0.0.15 any echo
!
!
!
!
!
!
line con 0
!
line aux 0
!
line vty 0 4
 password CISCO
 login
!
!
!
end