The solution to bandwidth problems is not always adding more bandwidth. It is about prioritizing and policing the available bandwidth to make sure that business critical applications gets the right priority when traversing over your WAN, MPLS or VPN links. Cisco Quality of Service or QoS, a feature available by default on your Cisco devices, is a technology designed specifically for this. With QoS, you can prioritize your business critical applications, and police, drop and even block other and unwanted applications.