Securing DHCP Traffic and DNS Traffic(Using IPsec)

Hello everybody.

There is an organization that asked us to secure their network traffic.

For wireless authentication, we enabled and configured 802.1x for access points and also switches.

We also enabled port seccurity on their switches.

Now they asked us to secure DNS, DHCP and Remote Desktop traffic.

Securing Remote Desktop traffic is done by using the IPsec. But there are my questions:

For DNS, can i just configure an IPSec policy on UDP 53 instead of DNSSEC? And what can i do for DHCP?

Regards,
Amir.