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A network device can be intermediate for several pairs of nodes, and each node can transmit the data of several services (Figure 2a). Let's look at the scheme there where the "Network device" is intermediate for the traffic coming from the following pairs of nodes pairs : Node-1 - Node-4, Node-2 - Node-5 and Node-3 - Node-6. The first pair transmits data of for three services, the second of for two , and the third of for one service. If there are no QoS settings, the data of all services get through the general queue in the order they are received on at the "Network device" and in the same order they will be transferred from the queue to the outgoing interfaces.

With QoS configured, each of the incoming traffic flows can be classified by its type (for example) and map a separate queue can be mapped to each class (Figure 2b). Each packet queue can be assigned a priority, which will be taken into account during while extracting the packets extraction from the queues, and will guarantee specific quality indicators. The traffic flows flow classification can be performed not only by with respect to the services used, but according to other criteria also. For example, each pair of nodes can be assigned a separate message packet queue (Figure 2c).

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