Another common use case of data policy is the ability to do traffic engineering based on applications or application families. For example, in dual-WAN (INET+MPLS) scenarios, an organization may want to route all noncritical traffic over the best-effort Internet links while routing all business-critical apps over the expensive MPLS circuits with guaranteed SLAs. Additionally, the organization may want to drop the noncritical traffic in case of an Internet link failure to prevent MPLS circuit oversubscription. On the other hand, in case of an MPLS circuit failure, all business-critical apps should fall back on any available transport. The diagram below illustrates an example where web applications represent the noncritical traffic, and database applications represent critical business traffic.