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CDP is needed for troubleshooting router "R1", but is currently disabled. Which of the following commands enables CDP on router "R1"?
R1(config)#cdp run
R1# cdp enable
R1(config)#cdp on
R1(config-cdp)#cdp
To enable CDP, globally on every interface on a device: use the command "cdp run" under the global configuration command. For more information refer to: http://www.cisco.com/c/en/us/td/docs/ios/122/configfun/command/reference/ffunr/frf015.html / - - - - - - - - - To enable CDP on just a single interface, or a range-of-interfaces, use "cdp enable". - - - -Of course, to turn it off, the commands are "no cdp run" -and- "no cdp enable"
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