This allows SQL Server DBAs to implement multi-subnet clusters within the same data center for high availability but also across data centers for disaster recovery purposes.
As SQL Server depends so much on the Windows Failover Cluster infrastructure, it is important to get it working properly prior to installing SQL Server 2012.
Most of us SQL Server DBAs do not have control over implementing network topologies as part of the implementation of a SQL Server failover cluster.
In most cases, the network topology has already been implemented and managed by the network engineers.
In my environment, storage system SAN1 is being replicated over to SAN2 via a TCP/IP connection.