Initial Configuration for three routers !!!

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Configuration on Router R1
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enable
config t
! assigning name to the Router
host R1
! assigning ip address on the interface FastEthernet 0/0
int fa0/0
no sh
ip add 7.7.7.1 255.0.0.0
! pointing default route towards Router R2
ip route 0.0.0.0 0.0.0.0 7.7.7.2
! shows ip address on the interfaces
do sh ip int br
!

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Configuration on Router R2
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enable
config t
! assigning name to the Router
host R2
! assigning ip address on the interface FastEthernet 0/0
int fa0/0
no sh
ip add 7.7.7.2 255.0.0.0
! assigning ip address on the interface FastEthernet 0/1
int fa0/1
no sh
ip add 8.8.8.1 255.0.0.0
! shows ip address on the interfaces
do sh ip int br
!

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Configuration on Router R3
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enable
config t
! assigning name to the Router
host R3
! assigning ip address on the interface FastEthernet 0/0
int fa0/0
no sh
ip add 8.8.8.2 255.0.0.0
! pointing default route towards Router R2
ip route 0.0.0.0 0.0.0.0 8.8.8.1
! shows ip address on the interfaces
do sh ip int br
!