Which command traces the NTP time source back to the primary time source?

Which command traces the NTP time source back to the primary time source?

• A. ntptrace
• B. ntpd
• C. ntpdate
• D. ntpq

Answer: (A)

Tracing the NTP time source requires a utility that can reveal the path from your machine to the ultimate reference clock. ntptrace does this by walking the association chain: it starts with your local NTP server and, step by step, shows the upstream peers and their strata until it reaches the primary reference clock (the primary time source, such as a GPS or radio clock). This gives you visibility into where the time is actually coming from and whether there are single points of failure in the chain. The other tools have different roles. ntpd is the daemon that keeps your system’s clock synchronized but doesn’t provide a built-in trace of the entire source path. ntpdate is a utility used to set the clock from a time source, historically in one-off runs, and isn’t designed for tracing the source chain. ntpq is a query tool for inspecting status and peers and can show which servers you’re syncing to and some timing metrics, but it doesn’t perform a full trace from your server back to the primary reference clock.

Tracing the NTP time source requires a utility that can reveal the path from your machine to the ultimate reference clock. ntptrace does this by walking the association chain: it starts with your local NTP server and, step by step, shows the upstream peers and their strata until it reaches the primary reference clock (the primary time source, such as a GPS or radio clock). This gives you visibility into where the time is actually coming from and whether there are single points of failure in the chain.

The other tools have different roles. ntpd is the daemon that keeps your system’s clock synchronized but doesn’t provide a built-in trace of the entire source path. ntpdate is a utility used to set the clock from a time source, historically in one-off runs, and isn’t designed for tracing the source chain. ntpq is a query tool for inspecting status and peers and can show which servers you’re syncing to and some timing metrics, but it doesn’t perform a full trace from your server back to the primary reference clock.