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NTP Questions

October 25th, 2017 Go to comments

Question 1


From a Cisco perspective, getting the clock from an Internet time source and/or from a local timing device both require the same command (ntp server). To have a specific network device consider itself as a reference clock source, another command is used (ntp master)

For example, the command

Router(config)#ntp server

configures the local device to use a remote NTP clock source from while the command:

Router(config)#ntp master 1

configures the local device as a NTP reference clock source with stratum of 1.

Reference: http://www.pearsonitcertification.com/articles/article.aspx?p=2141272

Question 2


An Authoritative NTP Server can distribute time even when it is not synchronized to an existing time server. To configure a Cisco device as an Authoritative NTP Server, use the ntp master [stratum] command.

Question 3

Question 4

Question 5


An Authoritative NTP Server can distribute time even when it is not synchronized to an existing time server. To configure a Cisco device as an Authoritative NTP Server, use the ntp master [stratum] command.

Question 6


Maybe the “current time sources” here mention about the status of the clock source. In the below output, the “show ntp associations” command reveals the IP address of the clock source (which is, the stratum (st) of this reference clock…

R1#show ntp associations
      address         ref clock     st  when  poll reach  delay  offset    disp
*~    9   509    64  200    32.2   15.44  16000.
 * master (synced), # master (unsynced), + selected, - candidate, ~ configured

Below is the output of the “show ntp status” command. From this output we learn that R1 has a stratum of 10 and it is getting clock from

R1#show ntp status
Clock is synchronized, stratum 10, reference is
nominal freq is 250.0000 Hz, actual freq is 249.9987 Hz, precision is 2**18
reference time is D5E492E9.98ACB4CF (13:00:25.596 CST Wed Sep 18 2013)
clock offset is 15.4356 msec, root delay is 52.17 msec
root dispersion is 67.61 msec, peer dispersion is 28.12 msec

For more information about these two commands, please read at: http://www.cisco.com/c/en/us/support/docs/ip/network-time-protocol-ntp/116161-trouble-ntp-00.html

In fact this question is unclear, but other answers are surely not correct.

Question 7


+ The “ntp authenticate” command is used to enable the NTP authentication feature (NTP authentication is disabled by default).
+ The “ntp trusted-key” command specifies one or more keys that a time source must provide in its NTP packets in order for the device to synchronize to it. This command provides protection against accidentally synchronizing the device to a time source that is not trusted.
+ The “ntp authentication-key” 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.

Question 8


In the below output, the “show ntp associations” command reveals the IP address of the clock source (which is, the stratum (st) of this reference clock and if a router is synced with the configured time source (in this case R1 is synchronized with, presented by a “*”).

R1#show ntp associations
      address         ref clock     st  when  poll reach  delay  offset    disp
*~    9   509    64  200    32.2   15.44  16000.
 * master (synced), # master (unsynced), + selected, - candidate, ~ configured
Comments (21) Comments
  1. pallab-ganguly@yahoo.com
    February 20th, 2017

    pls submit the questions

  2. Star
    February 21st, 2017

    Q1 answer should be NTP MASTER command and hence option C should be correct… Plz correct me if i am wrong..

  3. lrando
    February 26th, 2017

    I think Q1 is wrong also because I found this
    “Use the ntp server command to individually specify the time serving hosts that you want your networking device to consider synchronizing with and to set your networking device to operate in the client mode. ”

  4. drek147
    March 1st, 2017

    Q1 is wrong, ntp master is the right answer.

  5. Dick
    March 13th, 2017

    Is question 1 wrong or not?

  6. joetheplummer
    March 15th, 2017

    as per r&s command guide: ntp master is for use when an external source is not available or desirable.

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    March 15th, 2017

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  8. Anonymous
    June 1st, 2017

    Which NTP command configures the local device as an NTP reference clock source?
    A. ntp peer
    B. ntp broadcast
    C. ntp master
    D. ntp server

    Which is the correct one C or D?
    By online quiz, if we write answer C then it goes wrong. So whats the correct one?

  9. Virgil
    June 20th, 2017

    Passed today, Labs are same as the one here. Questions were all from this dumps https://twitter.com/premiumdumps1/status/873975372563566594

  10. K
    July 3rd, 2017
  11. German
    July 6th, 2017

    Passed, dumps shared by Virgil are valid! Thanks an good luck all

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    July 19th, 2017

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  13. osi
    August 14th, 2017

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  14. Mary
    August 25th, 2017

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  15. Mary
    August 25th, 2017

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  16. Mary
    August 25th, 2017

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  17. Batsman
    September 9th, 2017
  18. Yer
    October 16th, 2017

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  19. Anonymous
    March 23rd, 2018

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  20. 9tut
    March 23rd, 2018

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