CCNA 4 Chapter 7 2017 Exam Answers 100%

CCNA 4 Chapter 7 Exam Answers Full

  1. Where should QoS marking be performed?
    A. Closest to the source of the traffic
    B. Closest to the Internet router
    C. On every device in the network
    D. On the core router in the network
  2. Which measurement describes the time a packet takes from source to destination?
    A. Bandwidth
    B. Delay
    C. Jitter
    D. Loss
  3. How do routers classify traffic for QoS?
    A. Access control lists
    B. Layer 2 ASICs
    C. Route tables
    D. Frame filters
  4. Which measurement describes the variation of consecutive packet time from source to destination?
    A. Bandwidth
    B. Delay
    C. Jitter
    D. Loss
  5. Which is a true statement about the Class of Service field?
    A. The Class of Service field is a layer 3 field.
    B. The Class of Service field is only present in 802.1Q frames.
    C. The Class of Service field is present from end to end of a transmission.
    D. The Class of Service field is 6 bits.
  6. What is the measurement of packets discarded due to congestion of queues?
    A. Bandwidth
    B. Delay
    C. Jitter
    D. Loss
  7. Which technology is used to identify and mark applications such as Bittorrent and Netflix for QoS?
    A. ACLs
    B. Routing tables
    C. NBAR2
    D. Tail drop
  8. Which layer 3 protocol is used for marking packets with QoS?
    A. DSCP
    B. 802.1Q
    C. CoS
    D. QoE
  9. Which is a correct statement about device trust boundary for QoS?
    A. The trust boundary should always be an asset IT controls.
    B. The switch should always be set as the trust boundary.
    C. Only routers can create trust boundaries.
    D. Only IP phones can become trust boundaries.
  10. Which DSCP marking has the highest priority?
    A. DSCP AF 43
    B. DSCP EF 46
    C. DSCP AF 11
    D. DSCP AF 00
  11. What is the recommended maximum delay VoIP traffic should not exceed?
    A. 10 ms
    B. 90 ms
    C. 150 ms
    D. 300 ms
  12. Which QoS queue has priority over all other queues in the scheduler?
    A. CBWFQ
    B. LLQ
    C. FIFO
    D. CIR
  13. Which method helps combat queue starvation for QoS queuing?
    A. LLQ
    B. Policing
    C. CBWFQ
    D. FIFO
  14. Which statement is correct about shaping of traffic for QoS?
    A. Shaping holds packets in the queue over the configured bit rate to cause delay.
    B. Shaping drops packets over the configured bit rate to cause loss.
    C. Shaping holds packets in the queue over the configured bit rate to cause jitter.
    D. Shaping slows packets in the queue over the configured bit rate to adhere to the speed.
  15. Which QoS method uses a round-robin scheduler for packet queuing?
    A. LLQ
    B. FIFO
    C. CBWFQ
    D. PQ
  16. Which statement is correct about policing of traffic for QoS?
    A. Policing holds packets in the queue over the configured bit rate to cause delay.
    B. Policing drops packets over the configured bit rate to cause loss.
    C. Policing holds packets in the queue over the configured bit rate to cause jitter.
    D. Policing slows packets in the queue over the configured bit rate to adhere to the bit rate.
  17. When should QoS policing be implemented?
    A. To help police LAN applications
    B. To maintain a contracted CIR
    C. To help police WAN applications
    D. To maintain a contracted burst rate
  18. Which statement is correct about tail drop with QoS queues?
    A. Tail drop is a method of QoS.
    B. Tail drop happens when the queues round-robin.
    C. Tail drop happens when the queues are full.
    D. Tail drop helps slow down protocols that are monopolizing bandwidth.
  19. When should QoS shaping be implemented?
    A. When maintaining a contracted burst rate
    B. When LAN applications require a minimum bit rate
    C. When WAN applications require a minimum bit rate
    D. When the service provider is policing traffic
  20. Which command will allow the CoS value to be trusted for a VoIP phone?
    A. Switch(config-if)#auto qos trust cos
    B. Switch(config-if)#qos trust cos
    C. Switch(config-if)#cos trust qos
    D. Switch(config-if)#auto qos
  21. When configuring QoS for packet shaping, which is an important guideline to follow?
    A. Always make the bit rate small.
    B. Always make the time interval small.
    C. Always make the time interval large.
    D. Always use the maximum bit rate.
  22. How do congestion avoidance tools help to prevent tail drop?
    A. When the queue depth is full, a percentage of TCP packets are dropped.
    B. When the queue depth is empty, a percentage of TCP packets are dropped.
    C. When the queue depth is below the minimum threshold, a percentage of TCP packets are dropped.
    D. When the queue depth is above the minimum threshold, a percentage of TCP packets are dropped.
  23. Which command on a Cisco switch will show the default CoS value?
    A. Switch#show qos interface
    B. Switch#show mls qos interface
    C. Switch#show interface
    D. Switch#show qos
  24. If a traffic is marked with AF31 and another traffic pattern is marked with AF41, which statement explains the traffic markings?
    A. AF31 marked traffic has a better queue than AF41 marked traffic.
    B. AF41 marked traffic has a better queue than AF31 marked traffic.
    C. Both AF31 and AF41 marked traffic has an equal queue.
    D. During high congestion, AF41 queues will be dropped and AF31 queues won’t.

Leave a Reply