Which three commands are required to enable NTP authentication on a Cisco router? (Choose three)

Question:
Which three commands are required to enable NTP authentication on a Cisco router? (Choose three)

• ntp peer
• ntp max-associations
• ntp authenticate
• ntp trusted-key
• ntp authentication-key
• ntp refclock

Explanation: + The “ntp authenticate” command is used to enable the NTP authentication feature (NTP authentication is disabled by default).

+ The “ntp trusted-key” command specifies one or more keys that a time source must provide in its NTP packets in order for the device to synchronize to it. This command provides protection against accidentally synchronizing the device to a time source that is not trusted.

+ The “ntp authentication-key” defines the authentication keys. The device does not synchronize to a time source unless the source has one of these authentication keys and the key number is specified by the “ntp trusted-key number” command.

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