Router2 is configured to obtain time from three different NTP servers. You want to determine from which of the
three servers Router2 is currently synchronizing time.
Which of the following commands would not achieve your goal? (Select the best answer.)

A.
show clock detail

B.
show ntp associations

C.
show ntp associations detail

D.
show ntp status

Explanation:
Of the available choices, only the show clock detail command would not enable you to determine from which of
the three Network Time Protocol (NTP) servers Router2 is synchronizing time. The show clock detail command
displays the date and time as it is configured on the device and general information about the source of the
configuration. However, this command does not reveal the IP address or NTP peer status of an NTP source.
The following is sample output from the show clock detail command:
Router2#show clock detail
09:12:20.299 UTC Sat Jul 4 2015
Time source is NTP
The show ntp associations command and the show ntp associations detail command would both enable you
to determine from which of the three NTP servers Router2 is synchronizing time. The show ntp associations
command displays both the address of the NTP server from which the client obtains its time and the address of
the reference clock to which the NTP server is synchronized. When issued with the detail keyword, you can
additionally determine the IP address of the NTP peer from which time was synchronized, the NTP source
authentication status, the NTP hierarchical status of the server from which time was obtained, whether the NTP
peer passes basic sanity checks, whether NTP believes the time is valid, and the stratum of the NTP peer. The
following is sample output from both the show ntp associations command and the show ntp associations detail
command:

The presence of our_master in the output of the show ntp associations detail command indicates the status of
the device at the NTP peer IP address of 203.0.113.1. Similarly, the asterisk (*) in the output of the show ntp
associations command indicates that Router2’s NTP master is the device with the IP address of 203.0.113.1.
The show ntp status command would enable you to determine from which of the three NTP servers Router2 is
synchronizing time. The show ntp status command displays no information when NTP is not running on a
device. When NTP is running, the show ntp status command provides information about whether the local clock
is synchronized, the local clock’s stratum level, and the IP address of the NTP peer that the local device is
using as a reference clock. The following is sample output from the show ntp status command:

Cisco: Cisco IOS Basic System Management Command Reference: show clock