If your DHCP and Windows Deployment Servers are on the same machine, then you need to specify the scope options 60, 66 and 67. If WDS and DHCP servers are running on different servers, then you just need to configure scope options 66 and 67.
Option 66 defines the IP address of the PXE server
Option 67 defines the boot file
Configuring PXE on Distribution Points:
Launch the configuration manager 2012 console, click on Administration, Servers and Site system roles, right click Distribution point and click properties. Click on PXE tab, check the box “Enable PXE support for clients“.
After PXE Role is enabled, WDS will be automatically installed on C drive. Do not configure it! Configuring manually will cause problems on your WDS.