Checking if Load Balancing is working fine

Go to any web front and server connected on Network Load Balancing Manager.

1. Select Start Menu
2. Select Administrator Tools
3. Click on Network Load Balancing Manager.
4. Right click on any listed web front end server under "Network Load Balancing Clusters".
5. Select Control Host.
6. Click on Stop.
7. Now check the SharePoint Site using the load balancing url and it should work properly.
8. In same way stop each or multiple servers and site should be available until any single WFE  is started.
9. Finally Stop all WFEs now site should not be available.