Nokia Nokia Certifications 4A0-107 Questions & Answers

• Question 11:

  What type of unwanted packet drops can the proper configuration of a queue's burst-limit parameter prevent?

  A. Packet drops in the local queue resulting from traffic congestion.

  B. Packet drops on the downstream nodes resulting from traffic congestion.

  C. Packet drops in the local queue resulting from traffic bursts.

  D. Packet drops on the downstream nodes resulting from traffic bursts.

  Correct Answer: C

• Question 12:

  Which of the following statements about port schedulers is TRUE?

  A. A port scheduler can only be implemented on a network egress port when queue-groups are configured for that port.

  B. A port scheduler can be implemented on an access ingress port.

  C. A port scheduler can be implemented without HQoS on an access egress port.

  D. A port scheduler can be implemented on a network ingress port.

  Correct Answer: C

• Question 13:

  Assume all transmitted frames on a SONET port are 1500 bytes and that the average frame overhead has been configured as 10%. If the total bandwidth of all queues, excluding overhead, needs to be guaranteed at 55 Mbps, how much bandwidth should be configured for the egress port scheduler applied on that port?

  A. 55 Mbps / 1.1 = 50 Mbps

  B. 55 Mbps

  C. 55 Mbps + 55 Mbps * 0.1 / 1.1 = 60 Mbps

  D. 55 Mbps * 1.1 = 60.5 Mbps

  Correct Answer: D

• Question 14:

  When using an egress port scheduler, which scheduling loop priority are orphaned queues serviced on?

  A. 1st

  B. 8th

  C. 9th

  D. 17th

  Correct Answer: A

• Question 15:

  How many tiers of schedulers can be supported in hierarchical scheduling on the Nokia 7750 SR?

  A. 8

  B. 3

  C. 5

  D. 6

  Correct Answer: B

• Question 16:

  

  Based on the image shown above, and assuming that the default scheduler of the Nokia 7750 SR is on an IOM2 card, in which order will packets be scheduled?

  A. Queue 6 within-CIR packets, then queue 5 within-CIR packets, then queue 5 and queue 6 above-CIR packets in round-robin.

  B. Queue 6 within-CIR packets, then queue 5 within-CIR packets, then queue 5 and queue 6 above-CIR packets in biased round-robin.

  C. Queue 6 within-CIR packets, then queue 5 within-CIR packets, then queue 6 above-CIR packets, and finally queue 5 above-CIR packets.

  D. Queue 6 and queue 5 within-CIR packets in biased round-robin, then queue 5 and queue 6 above-CIR packets in round-robin.

  Correct Answer: B

• Question 17:

  If two queues complete for bandwidth in a hierarchical scheduler environment, which parameter is used by their parent scheduler to determine the priority with which each queue can use bandwidth above its committed rate?

  A. level

  B. cir-level

  C. weight

  D. cir-weight

  Correct Answer: C

• Question 18:

  When we select the adaptation rule "min", how are the operational CIR/PIR rates of a queue calculated?

  A. The administrative PIR values are ignored and both operational rates are set to the minimum residual rate allowed by the hardware.

  B. The administrative PIR value is ignored and both operational rates are set to the administrative CIR value.

  C. They are chosen as the largest multiple of the hardware rate step that is less than or equal to the corresponding CIR/PIR administrative value.

  D. They are chosen as the smallest multiple of the hardware rate step that is greater than or equal to the corresponding CIR/PIR administrative value.

  Correct Answer: D

• Question 19:

  Which of the following is NOT a valid configuration value for a queue's CIR parameter within a SAP-ingress policy?

  A. 0

  B. min

  C. max

  D. 50000

  Correct Answer: B

• Question 20:

  Which of the following about scheduling is TRUE?

  A. HQoS schedulers cannot be children of an egress port-scheduler.

  B. HQoS schedulers provide a dynamic method of allocating scheduling resources to queues.

  C. HQoS scheduler policies can be applied to an MDA to schedule network ingress traffic.

  D. A scheduler policy applied to multiple SAPs within the same service will result in a single hardware scheduler operating across all SAPs within the service.

  Correct Answer: D