While using session, requests are distributed among different servers. By default, session mode is set to In Proc where session data is stored inside worker process memory. But, in Web farm mode, we can share the session among all the servers using a single session store location by making it Out proc (State Server or SQL Server Mode). So, if some of the servers go down and request is transferred to the other server by the Load balancer, session data should be available for that request.
In the above diagram, you can see that we can both the IIS server sharing the same session data which is stored in out of worker process.
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