What is fail-over protection?
Fail-over protection is exactly what load balancing is designed to do. Load balancing is used to provide server fail-over protection for mission critical services. Basically, if one server fails, other servers take over the load and your users never experience any problems. You may also want to create fail-over protection for your load balancing service by having redundant load balancers. One load balancer will always be standing by to become active should the other fail. If this happens, the backup load balancer will become active and the other will become the backup once it is responding again.