Which network device does NTP authenticate?

Which network device does NTP authenticate?
A . Only the time source
B . Only the client device
C . The firewall and the client device
D . The client device and the time source

View Answer

Answer: A

Explanation:

You can configure the device to authenticate the time sources to which the local clock is synchronized. When you enable NTP authentication, the device synchronizes to a time source only if the source carries one of the authentication keys specified by the ntp trusted-key command. The device drops any packets that fail the authentication check and prevents them from updating the local clock. NTP authentication is disabled by default.

Source: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx­os/system_management/ configuration/guide/sm_nx_os_cg/sm_3ntp.html#wp1100303%0A