You can answer that we have only one server which handles the all request if you have small environment setup(with 10 -20 Users).
If you are working with more than 30 users then tell them we have configured tableau with 3 server for high availability. One main tableau server with 2 worker machines. You can configure this same using the tableau server configurator.
About Tableau Server : The Tableau server works on 3 different services. 1. Visual Server: This sends the queries to database and then coverts it to the visuals/Images you see in tableau. 2. Database/Repository Server: This manages the connectivity and maintains the data extracts. 3. Application Server: This handles the Authentication and Authorization.
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