Typically, when an application is deployed to a server farm, it has a central database, one or more application servers, and one or more web servers.
Since all services at the application level will be accessible through the web server, why not deploy the web server at the same physical level as the application server?
Specific request - what are the reasons for deploying the web server as a separate layer?
From a broader perspective, what are the general considerations when deciding on a deployment scenario?
source
share