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Which NTP mode must be activated when using a Cisco router as an NTP authoritative server?
Correct Answer: B
Cisco routers and switches can use 3 different NTP modes: NTP client mode. NTP server mode. NTP symmetric active mode. The symmetric active mode is used between NTP devices to synchronize with each other, it's used as a backup mechanism when they are unable to reach the (external) NTP server. The NTP server can operate in master mode to serve time using the local clock, when it has lost synchronization.