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To Find out if link is up and has Ip address

 Router#show ip int brief

 
To save the Router configuration

Router#copy running-config startup-config
 

 
 To check the content of routing table

Router#show ip route
 

 
To back up the content of IOS to Flash

Router#copy flash: tftp:
 

 
To Find out who is your neighbor in OSPF

Router#show ip ospf neighbor
 

To find out who is your neighbor in EIGRP

Router#show ip eigrp neighbors

 To see what is happening on Router

Router#show running-config

To a Router a Hostname

Router(config)#hostname XXX
 

To see the detail of OSPF under interface f0/0

Router#show ip ospf interface f0/0

 
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