Which command in the Cisco IOS enables an interface (brings it up)?

Which command in the Cisco IOS enables an interface (brings it up)?

• no shutdown
• enable
• shutdown
• startup 

 

EXPLANATION

The no shutdown command enables an interface (brings it up). This command must be used in interface configuration mode. It is useful for new interfaces and for troubleshooting. When you're having trouble with an interface, you may want to try a shut and no shut. Of course, to bring the interface down, reverse the command and just say shutdown. This command can be abbreviated no shut.

SOURCE

https://www.techrepublic.com/blog/data-center/10-commands-you-should-master-when-working-with-the-cisco-ios-104071/