Which IOS command is used to define the authentication key for NTP?
A. Switch(config)#ntp authentication-key 1 md5 C1sc0
B. Switch(config)#ntp trusted-key 1
C. Switch(config)#ntp source 192.168.0.1
D. Switch(config)#ntp authenticate
Which IOS command is used to define the authentication key for NTP?
Answer is A.
ntp authentication-key number md5 md5-string Defines the authentication key. This key must
match the value on the NTP server along with the
ntp trusted-key number value of the
Cisco CG-OS router in Step 4 below.
The Cisco CG-OS router does not synchronize to
the NTP server clocking source unless the
ntp authentication-key and the ntp trusted-key
values on the server and the Cisco CG-OS router
match.
The range for authentication keys is from 1 to
65535.
For the MD5 string, you can enter up to eight
alphanumeric characters.
Answer is A,
que is for defining the authe key
Answer is D
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/bsm/command/bsm-cr-book/bsm-cr-n1.html#wp2231112076
can’t you even read your own post ???
answer D – ENABLES authentication
answer A – DEFINES authentication
Correct answer is A
ntp authenticate: Enables or disables NTP authentication feature
The question is asking “which command is used to DEFINE authentication KEY”, so the answer would be A.
answer D