Nokia Nokia Certifications 4A0-107 Questions & Answers

• Question 131:

  Which of the following statements regarding scheduling on the Nokia 7750 SR is TRUE? (Choose two)

  A. When using profile-mode queues, traffic that is marked as in-profile on ingress and scheduled in the above-CIR loop will still be considered as in-profile at egress.

  B. When an HQoS strategy using an egress port-scheduler has been deployed, Tier 1 receives its scheduling rates based on the amount of egress bandwidth available for each forwarding class.

  C. The greater the difference between PIR and CIR rates in a queue, the less likely a CIR will be provided.

  D. Packets scheduled out of high-priority queues in the default scheduler will have a lower chance of packet loss at the expense of incurring a higher probability of delay.

  E. When using priority-mode queues, traffic that is marked as in-profile on ingress and scheduled in the above-CIR loop will be considered as in-profile at egress.

  Correct Answer: AC

• Question 132:

  Which of the following fields can be marked or remarked for frames belonging to a Layer 2 service?

  A. DSCP

  B. PREC

  C. Dot1p

  D. ToS

  E. Q-in-Q

  Correct Answer: C

• Question 133:

  Based on queue usage, which of the following QoS-policies when combined will allow queue rates to be dynamically allocated? (Choose two)

  A. The slope-policy

  B. The SAP-ingress policy

  C. The network-queue policy

  D. The scheduler-policy

  E. The network-policy

  F. The WRED-policy

  G. The arbitrator-policy

  Correct Answer: BD

• Question 134:

  Real-time rate limiting on the service ingress is a feature that performs_____________. Traffic above the defined PIR is ______________.

  A. Policing, expedited

  B. Metering, marked discard eligible

  C. Marking, marked discard eligible

  D. Policing, discarded

  E. Shaping, discarded

  Correct Answer: D

• Question 135:

  Which of the following parameters are used in a hierarchical scheduler-policy to specify the priority of the child scheduler/queue for allocating bandwidth beyond its committed rate? (Choose two)

  A. CIR

  B. CIR level

  C. CIR weight

  D. Rate

  E. Level

  F. Weight

  Correct Answer: EF

• Question 136:

  With hierarchical scheduling, up to ___________ tiers are supported on the Nokia 7750 SR.

  A. 8

  B. 3

  C. 4

  D. 5

  E. 6

  Correct Answer: B

• Question 137:

  Which of the following are entities of the Nokia 7750 SR on which you can NOT apply a network-queue policy? (Choose three)

  A. Router interfaces

  B. Ingress MDA

  C. Ingress Ethernet network ports

  D. Egress Ethernet network ports

  E. Service SAPs

  Correct Answer: ACE

• Question 138:

  When allocating scheduling resources, which of the following statements BEST describes how the egress port scheduler allocates bandwidth?

  A. The egress port scheduler takes the ratio of requested bandwidth to total bandwidth request from all children. It allocates bandwidth fairly, using these percentages and not exceeding the egress interface speed.

  B. The egress port scheduler allocates bandwidth based on a WRR distribution method that takes into account the CIR and PIR requested at each level and the max speed, either default or configured, on egress.

  C. The egress port scheduler allocates bandwidth on a first come, first served distribution method that takes into account the total CIR and PIR requested at each level and the max PIR requested from a single level.

  D. The egress port scheduler will limit the bandwidth offered to the egress port based on the over-subscription factor, provisioned under the router interface, while using a WRR scheduler for the remaining bandwidth.

  E. The egress port scheduler will use the Russian Dolls Method to allocate bandwidth to each level of requested bandwidth. HPO-Only is automatically set to 100%, allowing only high priority traffic to be buffered during congestion.

  Correct Answer: B

• Question 139:

  Which of the following QoS functions does the slope-policy perform?

  A. Classification

  B. Marking

  C. Queuing

  D. Congestion management

  E. Scheduling

  Correct Answer: D

• Question 140:

  Click the exhibit button below. Given that the slope-policy (below) has been enabled and applied on a network port, which of the following statements are TRUE? (Choose three)

  

  A. All out-of-profile traffic will be dropped before any in-profile is dropped.

  B. The time average factor of 0 will discard all packets arriving in the shared buffer pool.

  C. When the shared buffer utilization reaches 51%, in-profile packets might be dropped.

  D. The highest probability with which an out-of-profile packet can be dropped is 20%.

  E. When an in-profile packet arrives and the shared buffer utilization is at 69%, the packet will have approximately a 60% likelihood of being discarded.

  Correct Answer: ACE