R1#show run
Building configuration...

Current configuration : 1135 bytes
!
version 15.1
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname R1
!
!
!
enable secret 5 $1$mERr$9cTjUIEqNGurQiFU.ZeCi1
!
!
!
!
!
!
ip cef
no ipv6 cef
!
!
!
!
license udi pid CISCO2901/K9 sn FTX15243RTR-
!
!
!
!
!
!
!
!
!
no ip domain-lookup
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface GigabitEthernet0/0
 ip address 200.100.1.1 255.255.255.0
 duplex auto
 speed auto
!
interface GigabitEthernet0/1
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface Serial0/0/0
 ip address 200.100.12.1 255.255.255.252
 clock rate 2000000
!
interface Serial0/0/1
 ip address 200.100.13.1 255.255.255.252
!
interface Vlan1
 no ip address
 shutdown
!
router ospf 1
 router-id 1.1.1.1
 log-adjacency-changes
 network 200.100.1.0 0.0.0.255 area 0
 network 200.100.12.0 0.0.0.3 area 0
 network 200.100.13.0 0.0.0.3 area 0
!
ip classless
!
ip flow-export version 9
!
!
!
banner motd ^Cmessage-of-the-day^C
!
!
!
!
!
line con 0
 password cisco
 logging synchronous
 login
!
line aux 0
!
line vty 0 4
 password cisco
 login
line vty 5
 password cisco
 login
!
!
!
end

R1#sh ip int brief
Interface              IP-Address      OK? Method Status                Protocol 
GigabitEthernet0/0     200.100.1.1     YES manual up                    up 
GigabitEthernet0/1     unassigned      YES unset  administratively down down 
Serial0/0/0            200.100.12.1    YES manual up                    up 
Serial0/0/1            200.100.13.1    YES manual up                    up 
Vlan1                  unassigned      YES unset  administratively down down

R1#sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
       * - candidate default, U - per-user static route, o - ODR
       P - periodic downloaded static route

Gateway of last resort is not set

     200.100.1.0/24 is variably subnetted, 2 subnets, 2 masks
C       200.100.1.0/24 is directly connected, GigabitEthernet0/0
L       200.100.1.1/32 is directly connected, GigabitEthernet0/0
     200.100.12.0/24 is variably subnetted, 2 subnets, 2 masks
C       200.100.12.0/30 is directly connected, Serial0/0/0
L       200.100.12.1/32 is directly connected, Serial0/0/0
     200.100.13.0/24 is variably subnetted, 2 subnets, 2 masks
C       200.100.13.0/30 is directly connected, Serial0/0/1
L       200.100.13.1/32 is directly connected, Serial0/0/1

R1#


R1#sh ip ospf database
            OSPF Router with ID (1.1.1.1) (Process ID 1)

                Router Link States (Area 0)

Link ID         ADV Router      Age         Seq#       Checksum Link count
1.1.1.1         1.1.1.1         674         0x80000003 0x00ef1e 3
R1#

R2#show run
Building configuration...

Current configuration : 980 bytes
!
version 15.1
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname R2
!
!
!
!
!
!
!
!
no ip cef
no ipv6 cef
!
!
!
!
license udi pid CISCO2901/K9 sn FTX1524YT05-
!
!
!
!
!
!
!
!
!
no ip domain-lookup
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface GigabitEthernet0/0
 ip address 200.100.2.1 255.255.255.0
 duplex auto
 speed auto
!
interface GigabitEthernet0/1
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface Serial0/0/0
 ip address 200.100.12.2 255.255.255.252
!
interface Serial0/0/1
 ip address 200.100.23.1 255.255.255.252
 clock rate 2000000
!
interface Vlan1
 no ip address
 shutdown
!
router ospf 1
 router-id 2.2.2.2
 log-adjacency-changes
!
ip classless
!
ip flow-export version 9
!
!
!
banner motd ^Cmessage-of-the-day R2^C
!
!
!
!
!
line con 0
 password cisco
 logging synchronous
 login
!
line aux 0
!
line vty 0 4
 password cisco
 login
line vty 5
 password cisco
 login
!
!
!
end

R2#sh ip int brief
Interface              IP-Address      OK? Method Status                Protocol 
GigabitEthernet0/0     200.100.2.1     YES manual up                    up 
GigabitEthernet0/1     unassigned      YES unset  administratively down down 
Serial0/0/0            200.100.12.2    YES manual up                    up 
Serial0/0/1            200.100.23.1    YES manual up                    up 
Vlan1                  unassigned      YES unset  administratively down down
R2#

R3#show run
Building configuration...

Current configuration : 977 bytes
!
version 15.1
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname R3
!
!
!
!
!
!
!
!
ip cef
no ipv6 cef
!
!
!
!
license udi pid CISCO2901/K9 sn FTX1524S28O-
!
!
!
!
!
!
!
!
!
no ip domain-lookup
!
!
spanning-tree mode pvst
!
!
!
!
!
!
interface GigabitEthernet0/0
 ip address 200.100.3.1 255.255.255.0
 duplex auto
 speed auto
!
interface GigabitEthernet0/1
 no ip address
 duplex auto
 speed auto
 shutdown
!
interface Serial0/0/0
 ip address 200.100.13.2 255.255.255.252
 clock rate 2000000
!
interface Serial0/0/1
 ip address 200.100.23.2 255.255.255.252
!
interface Vlan1
 no ip address
 shutdown
!
router ospf 1
 router-id 3.3.3.3
 log-adjacency-changes
!
ip classless
!
ip flow-export version 9
!
!
!
banner motd ^Cmessage-of-the-day R3^C
!
!
!
!
!
line con 0
 password cisco
 logging synchronous
 login
!
line aux 0
!
line vty 0 4
 password cisco
 login
line vty 5
 password cisco
 login
!
!
!
end


R3#sh ip int brief
Interface              IP-Address      OK? Method Status                Protocol 
GigabitEthernet0/0     200.100.3.1     YES manual up                    up 
GigabitEthernet0/1     unassigned      YES unset  administratively down down 
Serial0/0/0            200.100.13.2    YES manual up                    up 
Serial0/0/1            200.100.23.2    YES manual up                    up 
Vlan1                  unassigned      YES unset  administratively down down


R3#sh ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
       * - candidate default, U - per-user static route, o - ODR
       P - periodic downloaded static route

Gateway of last resort is not set

     200.100.3.0/24 is variably subnetted, 2 subnets, 2 masks
C       200.100.3.0/24 is directly connected, GigabitEthernet0/0
L       200.100.3.1/32 is directly connected, GigabitEthernet0/0
     200.100.13.0/24 is variably subnetted, 2 subnets, 2 masks
C       200.100.13.0/30 is directly connected, Serial0/0/0
L       200.100.13.2/32 is directly connected, Serial0/0/0
     200.100.23.0/24 is variably subnetted, 2 subnets, 2 masks
C       200.100.23.0/30 is directly connected, Serial0/0/1
L       200.100.23.2/32 is directly connected, Serial0/0/1

R3#





