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Windows Server® 2008 Networking and Network Access Protection (NAP) by Microsoft Networking Team, Tony Northrup, Joseph Davies

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Planning and Design Considerations

QoS can be deployed to Windows computers with just a few clicks, but without proper planning, you might not realize any performance benefits. This section describes how to identify goals for your QoS implementation, specify DSCP values, plan traffic throttling, verify hardware and software requirements, and design QoS policies.

Setting QoS Goals

When planning QoS policies for your network, determine the applications that require QoS, and set latency and bandwidth goals for each application as follows:

  • Latency goals. Minimizing latency is critical for VoIP and video conferencing. Although lower latency is always better, the maximum end-to-end delay that humans can tolerate is 150–200 ms. Above 200 ms, people will ...

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