What is the command to authenticate an NTP time source?

What is the command to authenticate an NTP time source? (something in those lines)
A. #ntp authentication-key 1 md5 141411050D 7
B. #ntp authenticate
C. #ntp trusted-key 1

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7 thoughts on “What is the command to authenticate an NTP time source?

  1. Guys, A simple “ntp ?” CLI global config command will reveal the answer and settle all doubts.

  2. ntp authentication-key 1 md5 141411050D 7 >> Defines the authentication key
    ntp authenticate >> Enables or disables the NTP authentication feature

    B seems the correct answer the way the question is phrased.
    Tricky.

  3. I’m leaning towards B on this one

    r1(config)#ntp ?
    access-group Control NTP access
    authenticate Authenticate time sources
    authentication-key Authentication key for trusted time sources

  4. B is incorrect. That will simply enable NTP authentication. The correct answer is A. Read the question, you want to authenticate the time source. This has to be done with the md5 string.

    Defines the authentication keys. The device does not synchronize to a time source unless the source has one of these authentication keys and the key number is specified by the ntp trusted-key number command.

  5. I think “B” is correct
    here, directly from the Router :
    R1(config)#ntp ?
    access-group Control NTP access
    allow Allow processing of packets
    authenticate Authenticate time sources
    authentication-key Authentication key for trusted time sources
    ================
    R1(config)#ntp authenticate ?

    Answer “A” would be for entering the cmd for authentication-key

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