A Windows 2012 Server R2 failover cluster ensures fast application recovery and data protection in case of a system failure. If your active Security Center server fails, the failover server in the cluster will bring Security Center back online.
A virtual IP address is used to accept incoming client connections. The cluster then monitors the active server. If a failure is detected, the cluster replaces the active server with the failover server so that the system remains online. Clients do not know whether the active server or the standby server is managing the system as they are still connected to the same IP address.