Cisco Certified Network Associate (200-301 CCNA) – Question560

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

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:

Explanation:
ntp server192.168.1.1 makes the SW1 a client to the primary server reachable with an IP address of 192.168.1.1 NTP server makes SW1 a server and uses its own internal clock to provide the time when the connectivity to the primary server 192.168.1.1 fails.