• The three basic models for QoS are Best Effort, IntServ, and DiffServ. With Best Effort, no special QoS mechanisms are applied. With IntServ, applications signal to the network that they require QoS. With DiffServ, the network devices recognize the traffic classes of the packets and provide different QoS levels.
• The Differentiated Services model is the primary model used to implement QoS in IP networks because it is highly scalable and offers the capability to define many different levels of service.
• The Differentiated Services model uses a 6-bit DSCP to mark packets so that they will be treated with different levels of service as they traverse an IP network.
There are three basic networking models: Best Effort, IntServ, and DiffServ. DiffServ is the more scalable model to implement the required QoS for converged networks. With DiffServ, traffic is classified into different traffic classes, then marked. The network QoS policy then enforces differentiated services based on the markings. To implement the QoS policy, different QoS mechanisms are required.
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