The only NTP configuration on router R1 is the ntp server 10.1.1.1 command. Which answers describe how NTP works on the router?

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The only NTP configuration on router R1 is the ntp server 10.1.1.1 command. Which answers describe how NTP works on the router?

As an NTP server only
As an NTP client only
As an NTP server only after the NTP client synchronizes with NTP server 10.1.1.1
As an NTP server regardless of whether the NTP client synchronizes with NTP server 10.1.1.1

Explanation: The ntp server 10.1.1.1 command tells the router to be both an NTP server and client. However, the router first acts as an NTP client to synchronize its time with NTP server 10.1.1.1. Once synchronized, R1 knows the time to supply and can act as an NTP server.