Which configuration makes switch SW1 act as an NTP master if upstream NTP servers become unreachable?
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Correct answer: SW1# config t SW1(config)# ntp master SW1(config)# ntp server 192.168.1.1.
Why this is the answer
The ntp master command configures the switch to act as an authoritative NTP server, even if it cannot synchronize with an external NTP source. This ensures that the switch can provide time services to other devices on the network, preventing them from losing time synchronization if upstream servers become unavailable. The ntp server 192.168.1.1 command specifies an external NTP server for the switch to synchronize with when available. The option ntp peer is used for symmetric active/passive NTP associations, not for making a device an authoritative master. ntp backup is not a valid NTP command for this purpose. The option without ntp master would configure the switch to get time from the specified server but not to act as an authoritative master itself if the upstream server is unreachable.
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