After DHCP Role is added as one of the prerequisites you need to check the following:
- DHCP SCOPE - here you will set range of IP address or you can have the DHCP range of SonicWall or any router capable of it -that we can use for deployment to connect in the Windows Deployment Server during installation.
 
     Sample DHCP Scope:
2. DHCP SCOPE OPTION - you need to add the following base on my sample attached.
3. Credential - you need to provide the admin credential of the server in the IPv4 Properties for authentication



