200-301 Question 363
Single answerA network administrator is tasked with configuring a router to synchronize its clock using NTP from an external time source and also act as an NTP server for internal devices. The administrator enters the following commands:
ntp server 192.168.1.1
ntp master 3
After verifying the configuration, some internal devices do not synchronize their time. What is the most likely issue?
- A
The router is configured as both an NTP client and server, which is not supported.
- B
The
ntp mastercommand priority level (3) is too low for devices to synchronize. - C
The external NTP server at 192.168.1.1 is unreachable or misconfigured.
- D
The
ntp mastercommand is overriding synchronization with the external NTP server.
Show answer and explanation
Correct answer: C
Explanation
The router is configured to act as both an NTP client and server. However, if the external NTP server (192.168.1.1) is unreachable or misconfigured, the router cannot synchronize its own clock. Internal devices that rely on the router for time synchronization will also fail to synchronize as a result. Ensuring that the external NTP server is reachable and properly configured will resolve the issue.
- A. Incorrect.
This is incorrect because a device can act as both an NTP client (synchronizing with an external server) and an NTP server (providing time to internal devices).
- B. Incorrect.
This is incorrect because the priority level set using
ntp masterdoes not affect the ability of internal devices to synchronize with the router. - C. Correct.
This is correct because if the external NTP server (192.168.1.1) is unreachable or misconfigured, the router cannot synchronize its clock, resulting in internal devices failing to synchronize with it as well.
- D. Incorrect.
This is incorrect because the
ntp mastercommand allows the router to serve time to internal devices when no external NTP server is reachable, but it does not override synchronization with an external server if it is reachable.