COMPUTER NETWORKING

Detailed explanation-1: -7. Which model is the only QoS model with no mechanism to classify packets? Explanation: The best-effort model has no mechanism to classify packets and treats all networks packets equally. A voice packet would be treated in the same manner as an email packet.

Detailed explanation-2: -DiffServ: Arguably the most commonly used QoS model, DiffServ, works by assigning value to each traffic type. Administrators set a DSCP (differentiated services code point) value ranging from zero to 63 for each traffic type to classify it according to priority and group traffic according to traffic classes (TCs).

Detailed explanation-3: -Congestion management. These tools use packet classification and marking to determine which queue to place the packets in. Congestion management tools include priority queuing, first-in, first-out and low-latency queuing.

Detailed explanation-4: -There are three models for implementing QoS. QoS is implemented in a network using either IntServ or DiffServ. IntServ provides the highest guarantee of QoS, it is very resource-intensive, and therefore, not easily scalable. DiffServ is less resource-intensive and more scalable.