Which three mechanisms are required to deploy QoS on an IP WAN? (Choose three.)
A.
queuing and scheduling
B.
Call Admission Control
C.
traffic shaping
D.
link efficiency techniques
E.
traffic classification
F.
bandwidth provisioning
Explanation:
Queuing, Traffic Shaping, and Policing
Cisco has developed many different QoS mechanisms, such as queuing, policing, and traffic shaping, to enable network operators to manage and prioritize the traffic flowing on the network. Applications that are delay sensitive, such as VoIP, require special treatment to ensure proper application functionality. Queuing refers to the buffering process used by routers and switching when they receive traffic faster than can be transmitted. Different queuing mechanisms can be implemented to influence the order in which the different queues are serviced (that is, how different types of traffic are emptied from the queues). Table 6-6 identifies QoS considerations to optimize bandwidth.Cisco Press CCDA 640-864 Official Certification Guide Fourth Edition, Chapter 6
