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CCNP Quick Reference Sheets Bundle: Exams 642-901, 642-812, 642-845, 642-825 by Jay Swan, Denise Donohue, Brent Stewart

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Chapter 4. QoS Details

This chapter explores, in detail, ways of choosing and configuring quality of service. The way you classify and mark traffic, and the type of QoS policies you implement, will depend on the policy location and types of network traffic present.

Classification and Marking

Classification is the most basic Quality of Service (QoS) step—until traffic is identified, it cannot be provided a unique level of service. Traffic is often classified by application, source or destination IP address, or inbound interface.

After traffic is classified, an appropriate marking can be applied to it. The location where traffic is marked defines a trust boundary. If the device that marked the traffic is trusted, then that marking is passed through ...

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