Hi,
As official article Windows Deployment Services Overview says,
So we could configure multiple WDS in your company.
But if you have different domain environment, it would be recommended to configure multiple WDS servers in a domain rather than one WDS server cross multiple domain which will have a heavy load to response.
However, as Multiple WDS server on the same network? says,
However, you will not have an option to choose which WDS server you would like to connect.
When PXE booting from a client, The first WDS server who responds to it will server this client. If you would like to manually set which WDS server will serve a client, you can prestage the client, update IP helper or use DHCP options.
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Bests,
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