A network administrator wants a Cisco router to synchronize its clock with an external NTP server at 192.0.2.1 and provide time synchronization to internal network devices. Which command should the administrator implement on the router to achieve this?
Enter the command 'ntp peer 192.0.2.1' on the router
Enter the command 'ntp global' on the router
Enter the command 'ntp server 192.0.2.1' on the router
Enter the commands 'ntp server 192.0.2.1' and 'ntp master' on the router
The correct command is ntp server 192.0.2.1. This command tells the router to synchronize its clock with the external NTP server at 192.0.2.1. Once the router's clock is synchronized, it will automatically serve NTP to internal clients that are configured to use it as their NTP server. The ntp master command is unnecessary here; it forces the router to act as an authoritative NTP server without referencing any external time source, which is not desired when an accurate external server is available. The ntp peer command establishes a symmetric active peer relationship, which is used between devices of equal stratum and is not appropriate for a client-server setup in this scenario. The ntp global is not a valid command.
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