Configure L3SW on the DNS server of another NW device

[Translator]

We plan to use WS-C3850-24T-S (IOS-XE 03.07.03E) as a DNS server for other ciscoNW devices.
How do I use it as a DNS server and see if it's already possible?

[Translator]

Wrong NTP server, not DNS server above. The following is the content of the question.
We plan to use WS-C3850-24T-S (IOS-XE 03.07.03E) as an NTP server for other ciscoNW devices.
How do I use it as an NTP server and check if it is already available?

[ammahend]

You can set the 3850 as NTP master and configure it as NTP server on NW device. 
use this for config example.