Interaction between applicationsever and web sever?

Answer 1

Application Server: This is the server where you core application rests. Here you will have business logic, computing, access to the database, business rules; etc.

The web server will simply house your asp, aspx, html, etc.... pages. These pages act as the human interface to your application. Here people will be able to view data; pushed to the page by the application layer, and in whole or part obtained from the database server.

When information is entered into the web interface and saved / committed it is passed to the application server. From here calculations are done, if needed, data validation, and ultimately stored to the database using the business rules that have been programmed into the application.

The web interface should never communicate with the database server directly.