Chapter 5. Implementing QoS
The rapid adoption of IP communications and the deployment of more complex and bandwidth-demanding applications led to a tremendous increase in network use. In a network with limitless resources, this would not be an issue. Although the technology is available to throw bandwidth and more powerful switching nodes at the problem, that is not always the best solution. A TCP session, for example, tries to use as much bandwidth as is available, to the detriment of other IP flows using the same links. Regardless of bandwidth, links can become congested due to various factors such as backing up failed paths in the network or handling the unpredictable traffic resulting from a security attack. At the same time, upgrading links ...
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