120 Labs for Cisco CCNA 200-125 and CCENT Exams

Lab 35: Configuring a Router as an NTP Client

Lab Objective:

The objective of this lab exercise is for you to learn and understand how to configure the Cisco router to access the time from an NTP server.

Lab Purpose:

NTP is an important tool used by Cisco equipment to ensure that devices share a consistent time. It is also used to add accurate timestamps to debug messages.

Certification Level:

This lab is suitable for CCENT and CCNA certification exam preparation.

Lab Difficulty:

This lab has a difficulty rating of 5/10.

Readiness Assessment:

When you are ready for your certification exam, you should complete this lab in no more than 5 minutes.

IMPORTANT NOTE: In order to test NTP, you will need to be connected to an actual NTP server that you probably will not have with a home lab or remote rack.

Lab Topology:

Please use the following topology to complete this lab exercise:

Task 1:

Configure the hostname on router R1 as illustrated in the topology.

Task 2:

Set the clock manually to any time zone and time of your choice.

Task 3:

Configure R1 to access two NTP servers. Use any IP addresses you wish.

Task 4:

Verify your NTP configurations with the appropriate show commands.

Configuration and Verification

Task 1:

For reference information on configuring hostnames, please refer to earlier labs.

Task 2:

R1#clock set 15:10:30 15 June 2014 
*Jun 15 15:10:30.000: %SYS-6-CLOCKUPDATE: System clock has been updated from 00:02:21 UTC Fri Mar 1 2002 to 15:10:30 UTC Sun Jun 15 2014, configured from console by console.
R1#show clock 
15:10:35.375 UTC Sun Jun 15 2014

Task 3:

Some of these commands won’t work with Packet Tracer.

R1(config)#ntp server prefer 
R1(config)#ntp server 

Task 4:

R1#show ntp associations 

address     ref clock     st  when  poll reach  delay  offset   disp 
~       16  -     64   0      0.0    0.00     16000. 
~       16  -     64   0      0.0    0.00     16000. 
* master (synced), # master (unsynced), + selected, - candidate, ~ configured 

R1#show ntp status        
Clock is unsynchronized, stratum 16, no reference clock 
nominal freq is 250.0000 Hz, actual freq is 250.0000 Hz, precision is 2**18 
reference time is 00000000.00000000 (00:00:00.000 UTC Mon Jan 1 1900)
clock offset is 0.0000 msec, root delay is 0.00 msec 
root dispersion is 0.00 msec, peer dispersion is 0.00 msec 

You can add another router and configure it as an NTP server with the command below:

R1(config)#ntp master ? 
 <1-15>  Stratum number 

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