Which command can you enter to verify that a router is synced with a configures time source?

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Question:
Which command can you enter to verify that a router is synced with a configures time source?

show ntp authenticate
ntp associations
ntp server time
ntp authenticate
show ntp associations

Explanation: In the below output, the “show ntp associations” command reveals the IP address of the clock source (which is 209.65.200.226), 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 10.1.2.1, presented by a “*”).

R1#show ntp associations
      address         ref clock     st  when  poll reach  delay  offset    disp
*~10.1.2.1         209.65.200.226    9   509    64  200    32.2   15.44  16000.
 * master (synced), # master (unsynced), + selected, - candidate, ~ configured

Exam with this question: CCNA v3.0 (200-125) Study Guide – Exam Dumps