Example Config Network (For Web Server and Application Server)

From picture, It has two zone (Web Zone and Application Zone)
1. Web Server, It has IP in Lan --> 10.221.7.120 but it access from outside IP 172.20.3.1 (Internet IP) . Sometimes, it will be other system protect (ex. firewall) . The other side which it will access Application Server, it has IP 192.168.0.50(Intranet IP).
2. In case Websphere, It will not load balance between Web Server and Application Server because Websphere can operate load balance itself.