Which command is required to configure a device as an NTP master?
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Correct answer: ntp master.
Why this is the answer
The ntp master command configures the device to act as an authoritative NTP server, even if it cannot synchronize with an external time source. This is crucial for isolated networks or as a fallback. It assigns a stratum level (default 8) to the device, indicating its distance from a primary time source. ntp peer is used to configure two NTP servers to synchronize with each other. ntp authenticate enables NTP authentication to ensure time updates come from trusted sources. ntp server specifies an upstream NTP server from which the device should obtain its time.
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