CCNA: Cisco Certified Network Associate — Question 316

An engineer is configuring switch SW1 to act as an NTP server when all upstream NTP server connectivity fails. Which configuration must be used?

Answer options

• A. SW1# config t SW1(config)#ntp peer 192.168.1.1 SW1(config)#ntp access-group peer accesslist1
• B. SW1# config t SW1(config)#ntp master SW1(config)#ntp server192.168.1.1
• C. SW1# config t SW1(config)#ntp backup SW1(config)#ntp server192.168.1.1
• D. SW1# config t SW1(config)#ntp server192.168.1.1 SW1(config)#ntp access-group peer accesslist1

Correct answer: B

Explanation

The correct answer is B because configuring SW1 as an NTP master allows it to provide time services to clients when upstream servers are unavailable. Options A, C, and D are incorrect configurations for setting up SW1 as a master NTP server; they either utilize peer configurations or do not designate SW1 as a master, which is required in this scenario.