Please guide me PDC and ADC DNS setting in the IPv4 which it the Best practice

i am having PDC and ADC both having dns,

i have some doubt in the IP configuration

Present IP configuration in the PDC

IP : 192.168.1.10

Subnet:255.255.255.0

Gateway:192.168.1.1

Preferred DNS:192.168.1.10

Alternate DNS: 192.168.1.11

Present IP configuration in the ADC

IP : 192.168.1.11

Subnet:255.255.255.0

Gateway:192.168.1.1

Preferred DNS:192.168.1.11

Alternate DNS: 192.168.1.10

Ratheesh