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 
R1# 
*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 10.1.1.1 prefer 
R1(config)#ntp server 172.16.1.1 
R1(config)# 
R1(config)#end

Task 4:

R1#show ntp associations 

address     ref clock     st  when  poll reach  delay  offset   disp 
~10.1.1.1   0.0.0.0       16  -     64   0      0.0    0.00     16000. 
~172.16.1.1 0.0.0.0       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 
R1#

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

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

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