Chapter 18. Quality of Service (QoS)

Quality of Service (QoS) refers to tools that network devices can use to manage several related characteristics of what happens to a packet while it flows through a network. Specifically, these tools manage the bandwidth made available to that type of packet, the delay the packet experiences, the jitter (variation in delay) between successive packets in the same flow, and the percentage of packet loss for packets of each class. These tools balance the tradeoffs of which types of traffic receive network resources, and when, giving more preference to some traffic, and less preference to others.

In the entire history of CCNA R&S, the exam topics have not focused on QoS beyond the barest small mention—until this ...

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