What is the command to authenticate an NTP time source? (something in those lines)
A.
#ntp authentication-key 1 md5 141411050D 7
B.
#ntp authenticate
C.
#ntp trusted-key 1
D.
#ntp trusted-key 1
Explanation:
BD
ntp authentication-key 1 md5 141411050D 7
ntp authenticate
ntp trusted-key 1
ntp update-calendar
ntp server 192.168.1.96 key 1 prefer source FastEthernet0/1
Source: Cisco Official Certification Guide, Example 11-15 Using Authentication via Keys with NTPv3, p.314