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Quality of Service(QOS) Fundamentals

QOS is a technique to prioritize important traffic over less important traffic based on the class and characteristics of the traffic. For an example a VoIP traffic adheres to low latency and guaranteed delivery with a low amount of bandwidth unlike a FTP traffic adheres more BW. By default a network device treat all kind of traffic in a same manner and use best effort in terms of delivering the packets to the destination. A network device place the traffic in a FIFO(First in First Out) Queue of the Output Buffer to accomplish it. But when there is a Congestion(Queue is full), the packets are likely to be dropped. In this situation the QOS comes into picture to handle the congestion and condition the packet depending on their characteristics. Path Characteristics A packed is originated from a source and to be delivered to a destination, travels many hops and links. […]

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