A network administrator needs to configure a Cisco router to synchronize its clock with an external time source at IP address 192.168.1.1. Which command should they use?
The correct command is ntp server 192.168.1.1. This command configures the router to use the specified Network Time Protocol (NTP) server for automatic time synchronization. The clock set command manually sets the router's clock but does not provide ongoing synchronization with an external source. The sntp source command is not valid for setting up time synchronization on Cisco routers. Likewise, time source is not a recognized command in Cisco IOS for configuring time synchronization.
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Cisco CCNA 200-301
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