In corporate networks you can use Differentiated Services Code Point (DSCP) values to prioritize traffic for best performance of the most important traffic. However, if you manage a small network and your perimeter devices do not support DSCP, there is an alternative method known as traffic throttling which allows you to specify the amount of bandwidth a specific application can consume. Traffic throttling does not have any network infrastructure requirements.
Although, the cost of bandwidth is much cheaper now-a-days, you cannot throw more bandwidth to applications to solve network congestion problems without controlling the consumption by the various bandwidth-hungry applications! As the trend of multimedia streaming and real-time networking is increasing at an extraordinary pace, network congestion problems will occur as these applications tend to consume all available bandwidth.