DHCP and DNS configuration on a cisco router

Dhcp and Dns Server Configs

#configs run on router onstick and must be on the configuration terminal mode

#dhcp pool
#billing 172.16.0.32/27  gateway:172.16.0.33 dns:172.16.0.34
#admin 172.16.0.64/27    gateway:172.16.0.65 dns:172.16.0.66
#reception 172.16.0.0/27 gateway:172.16.0.1  dns:172.16.0.2


config t
ip dhcp pool reception
network 172.16.0.0 255.255.255.224
default-router 172.16.0.1
dns-server 172.168.0.2
exit
ip dhcp excluded-address 172.16.0.1 172.168.0.2
ip dhcp pool admin
network 172.16.0.64 255.255.255.224
default-router 172.16.0.65
dns-server 172.168.0.66
exit
ip dhcp excluded-address 172.16.0.65 172.168.0.66
ip dhcp pool biling
network 172.16.0.32 255.255.255.224
default-router 172.16.0.33
dns-server 172.168.0.34
exit
ip dhcp excluded-address 172.16.0.33 172.168.0.34

verify then configs:
copy running-config startup-config