Implementing and Operating Cisco Security Core Technologies (SCOR) — Question 368

An engineer is adding a Cisco router to an existing environment. NTP authentication is configured on all devices in the environment with the command ntp authentication-key 1 md5 Cisc433392759. There are two routers on the network that are configured as NTP servers for redundancy, 192.168.1.110 and 192.168.1.111. 192.168.1.110 is configured as the authoritative time source. What command must be configured on the new router to use 192.168.1.110 as its primary time source without the new router attempting to offer time to existing devices?

Answer options

• A. ntp server 192.168.1.110 primary key 1
• B. ntp server 192.168.1.110 key 1 prefer
• C. ntp peer 192.168.1.110 prefer key 1
• D. ntp peer 192.168.1.110 key 1 primary

Correct answer: B

Explanation

The correct command is 'ntp server 192.168.1.110 key 1 prefer' as it allows the new router to use 192.168.1.110 as its primary time source without offering time to others. Option A incorrectly uses 'primary,' which is not valid in this context. Options C and D use 'ntp peer,' which is not suitable for a server configuration.