Cisco Certified Network Associate (CCNA) 200-301 — Question 566

The correct answer is C. Option C: ntp authenticate ntp authentication-key 2 md5 CISCO123 ntp source Loopback0 ntp access-group server-only 10 ntp master 2 ! access-list 10 permit 209.165.200.225

Explanation

NTP synchronizes device clocks so logs, certificates, and operations share consistent time.