The concept of QoS is covered in detail in the following 3 playlists:
1 - #QoS - Explains how the quality of service (QoS) provides different levels of priority to traffic crossing the network. Discusses the need for and advantages of QoS.
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2 - #Hard QoS - Discusses the advantages and disadvantages of hard QoS, which provides guaranteed levels of service to network traffic.
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3 - #Soft QoS - Discusses the advantages and disadvantages of soft QoS, which provides priority levels (rather than guarantees) to network traffic.
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Today's lesson is about hard quality of service. This type of QoS offers a guaranteed level of service to different traffic flows.

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