Cisco CCNA 4 Chapter 6 version 6 Exam Answers

  1. 1. Question
    When QoS is implemented in a converged network, which two factors can be controlled to improve network performance for real-time traffic? (Choose two.)
    •  jitter
  2. 2. Question
    A network engineer performs a ping test and receives a value that shows the time it takes for a packet to travel from a source to a destination device and return. Which term describes the value?
    •  latency
  3. 3. Question
    What are two characteristics of voice traffic? (Choose two.)
  4. 4. Question
    How does a Cisco router using tail drop handle congestion when a traffic queue becomes full?
    •  The router will drop any packet that arrives at the end of the queue.
  5. 5. Question
    For classifying packets into classes with CBWFQ, what is the purpose of configuring a maximum packet limit for a class?
    •  to control the maximum number of packets allowed in a single queue
  6. 6. Question
    A network engineer is selecting a QoS method to control congestion on a VPN tunnel link between the headquarters site and a branch office. Which queuing method cannot be used to classify and control VPN traffic?
    •  WFQ
  7. 7. Question
    An administrator has mastered the use of access control lists (ACLs) and wants to deploy QoS by defining different traffic classes through the use of ACLs. Which queuing method provides this functionality?
    •  CBWFQ
  8. 8. Question
    Which queuing algorithm has only a single queue and treats all packets equally?
    •  FIFO
  9. 9. Question
    A network administrator is deploying QoS with the ability to provide a special queue for voice traffic so that voice traffic is forwarded before network traffic in other queues. Which queuing method would be the best choice?
  10. 10. Question
    What are two characteristics of DiffServ QoS model? (Choose two.)
    •  groups all TCP flows into a single class
    •  can divide network traffic into classes based on business requirements
  11. 11. Question
    What are two characteristics of the best-effort QoS model? (Choose two.)
    •  It does not provide a delivery guarantee for packets.
    •  It treats all network packets in the same way.
  12. 12. Question
    What role do network devices play in the IntServ QoS model?
    •  Network devices ensure that resources are available before traffic is allowed to be sent by a host through the network.
  13. 13. Question
    Which QoS model is very resource intensive and provides the highest guarantee of QoS?
  14. 14. Question
    In QoS models, which type of traffic is commonly provided the most preferential treatment over all other application traffic?
    •  voice traffic
  15. 15. Question
    What are two approaches to prevent packet loss due to congestion on an interface? (Choose two.)
    •  Drop lower-priority packets.
    •  Increase link capacity.
  16. 16. Question
    What two fields are available in IPv4 and IPv6 headers to mark packets for QoS? (Choose two.)
    •  Traffic Class
    •  Type of Service
  17. 17. Question
    What is the benefit of deploying Layer 3 QoS marking across an enterprise network?
    •  Layer 3 marking can carry the QoS information end-to-end.
  18. 18. Question
    Which QoS technology provides congestion avoidance by allowing TCP traffic to be throttled before buffers become full and tail drops occur?
    •  weighted random early detection
  19. 19. Question
    Refer to the exhibit. As traffic is forwarded out an egress interface with QoS treatment, which congestion avoidance technique is used?
    CCNA4 v6.0 Chapter 6 Exam 001
    CCNA4 v6.0 Chapter 6 Exam 001
    •  traffic policing
  20. 20. Question
    Which QoS model uses the DSCP bits to mark packets and provides 64 possible classes of service?
    •  DiffServ
  21. 21. Question
    Which QoS technique retains excess packets in a separate queue for later transmission?
    •  shaping

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