Which diagram

Hi, I want describe an inviroment of serveral computers (Client-PC, Domaincontroller, DNS-Server, …).
Which diagram can I use therefor?

The closest diagram type to your requirement IMO is Deployment Diagram. You can create and use appropriate stereotypes to model servers and clients etc.

If you’ve access to Visio, it has specific diagrams for modeling networks and the likes.

Hope that helps.