单项选择题

Which statement is true about the comparison of voice traffic with video traffic？（）

A. Video conferencing traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flows.
B. Latency requirements are less stringent for video traffic than for voice traffic.
C. Video traffic is less sensitive to dropped packets than for voice traffic.
D. Video traffic requires the retransmission capabilities of TCP whereas voice uses UDP.
E. Voice traffic tends to be much more bursty in nature and is more prone to have an impact on other traffic flows.
F. Voice traffic requires the retransmission capabilities of TCP whereas video uses UDP.

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多项选择题

What are two steps needed to define a QoS policy for a traffic class？（）

A. Determine a minimum bandwidth guarantee.
B. Determine interfaces to which to apply policy.
C. Assign priorities to the class.
D. Configure access control lists.

多项选择题

What are three considerations when choosing the QoS model to deploy in a network？（）

A. the routing protocols being utilized in the network
B. the applications utilizing the network
C. the traffic destinations
D. network addressing scheme
E. cost of implementation
F. the amount of the control needed of the resources

多项选择题

Which three statements are true about the application of QoS models？（）

A. The DiffServ model requires applications to signal the network with QoS requirements.
B. The DiffServ model can be used to deliver QoS based upon IP precedence， or source and destination addresses.
C. The DiffServ model requires RSVP.
D. The best effort model is suitable for applications such as file transfer and e-mail
E. The IntServ model requires applications to signal the network with QoS requirements.
F. The IntServ model attempts to deliver a level of service based on the QoS specified by each packet