(QoS (Quality of Service) is a network security mechanism and a technology used to solve problems such as network delay and congestion. Under normal circumstances, if the network is only used for a specific use system without time restrictions, QoS is not required, such as Web use, or E-mail settings. But it is necessary for important use and multimedia use. When the network is overloaded or congested, QoS can ensure that important traffic is not delayed or lost, while ensuring the efficient operation of the network.)
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