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NTP Questions

March 16th, 2020 Go to comments

Question 1

Explanation

To configure a Cisco device as an Authoritative NTP Server, use the ntp master [stratum] command.

To configure a Cisco device as a NTP client, use the command ntp server <IP address>. For example: Router(config)#ntp server 192.168.1.1. This command will instruct the router to query 192.168.1.1 for the time.

Question 2

Explanation

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 10.1.2.1.

R1#show ntp status
Clock is synchronized, stratum 10, reference is 10.1.2.1
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

Question 3

Explanation

To configure authentication, perform this task in privileged mode:

Step 1: Configure an authentication key pair for NTP and specify whether the key will be trusted or untrusted.
Step 2: Set the IP address of the NTP server and the public key.
Step 3: Enable NTP client mode.
Step 4: Enable NTP authentication.
Step 5: Verify the NTP configuration.

Reference: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4000/8-2glx/configuration/guide/ntp.html

Note: A trusted NTP server may or may not require a secret key so it is not a “must” in this question.

Comments (1) Comments
  1. dotan
    June 15th, 2020

    @9tut
    Hey,
    Regarding question # 3, A and D That is the answer.
    And in other dumps, the answer is D and E.
    Is the answer to your questions well-tested?

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