show ntp status is a Cisco IOS EXEC command for verifying whether the software clock is synchronized and locating the device within the NTP stratum hierarchy. section 2.3.1
Interpreting the status line
On R1, “Clock is synchronized, stratum 2, reference is 216.239.35.0” means R1 synchronizes with a stratum 1 server and therefore operates at stratum 2. section 2.3.1
R1(config)# do show ntp status Clock is synchronized, stratum 2, reference is 216.239.35.0 #1 nominal freq is 1000.0003 Hz, actual freq is 1000.0003 Hz, precision is 2**16 ntp uptime is 7500 (1/100 of seconds), resolution is 1000 reference time is E897F742.5E14162D (13:49:06.367 JST Tue Aug 29 2023) . . . #1 R1 is synced to a stratum 1 server and is, therefore, stratum 2.
Use the listing to inspect the synchronization state, stratum, reference address, frequency, precision, and reference time; CCNA verification focuses on the top line. section 2.3.1
Read the command output with these exam-relevant points:
- “Clock is synchronized” confirms that NTP has synchronized the software clock. section 2.3.1
- The reference address identifies the NTP server currently supplying time. section 2.3.1
- NTP updates the software clock by default, not the hardware calendar; ntp update-calendar can update the calendar periodically. section 2.3.1
