Providing sufficient Quality of Service (QoS) across IP networks has become an extremely important aspect in today's IT infrastructure. Apart from Voice and video streaming QoS is also important for supporting Internet of Things(IoT). Why is QoS important? One might have seen that there exist some applications that are delay sensitive for eg. game streaming websites. These websites prefer UDP protocol over TCP. The major factor differentiating the two is TCP re-transmits the lost packets whereas UDP does not care about the lost packets. Obviously for a streaming site or during an IP phone call lost packets are of least importance as re-transmitting them does not make any sense as the voice packets come in an orderly manner. Therefore these lost packets become a matter of concern as the voice quality of a call becomes unintelligible. However TCP on the other hand is preferred mostly while transmitting data from one PC to other as it will re-transmit any lost packet in order to
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