Nokia Nokia Certifications 4A0-107 Questions & Answers

• Question 121:

  Which of the following rate-limiting approaches are used on the Nokia 7750 SR? (Choose two)

  A. Shapeless policing at SAP-ingress only.

  B. Shapeless policing at SAP-ingress and egress.

  C. Biased round robin queuing at ingress only.

  D. Soft shaping at all network interfaces.

  E. Soft shaping at network ingress only.

  Correct Answer: DE

• Question 122:

  If a packet is marked on a SAP-ingress, it will be remarked at the first network egress point (if remarking is enabled in the network egress policy).

  A. TRUE

  B. FALSE

  Correct Answer: B

• Question 123:

  Click the exhibit button below. Given the scheduler-policy (below), which of the following can be done to guarantee that the best-effort traffic receives its configured CIR value?

  

  A. Change the CIR-level value for the best-effort queue to 8.

  B. Do not change anything; it is already guaranteed to receive its CIR

  C. Change the CIR-level value for the best-effort queue to 1.

  D. Change the CIR-weight value of the AF queue to 0.

  Correct Answer: AD

• Question 124:

  Which of the following statements describe the operation of WRED on the Nokia 7750 SR? (Choose three)

  A. WRED monitors the shared buffer space utilization over a period of time.

  B. WRED disables the TCP slow-start congestion control mechanism.

  C. WRED uses two configurable slopes for each buffer pool: a high slope and a low slope.

  D. WRED uses the shared buffer utilization, instead of the individual queue depth, to get a better picture of the average resource utilization of the shared buffer space.

  E. WRED polices the shared buffer pool and marks all packets above a certain rate as "discard eligible."

  Correct Answer: D

• Question 125:

  Click the exhibit button below. The service provider has both a VLL (epipe) service and a VPLS, as shown in the diagram below.

  

  At router PE B, traffic arriving from both services will have the same network-queue policy applied.

  A. TRUE

  B. FALSE

  Correct Answer: B

• Question 126:

  In which policies, on the Nokia 7750 SR. is classification performed? (Choose three)

  A. SAP-ingress policy

  B. SAP-egress policy

  C. IP-criteria policy

  D. Network-queue policy

  E. Slope policy

  F. Network policy

  Correct Answer: A

• Question 127:

  Which of the following are categories of forwarding classes on the Nokia 7750 SR? (Choose two)

  A. Real-time

  B. Assured

  C. Non-conforming

  D. High priority

  E. In-profile

  Correct Answer: AD

• Question 128:

  When deploying a Nokia MPLS network with QoS, how are the EXP bits set?

  A. The first 3 bits of the DSCP value are copied directly into the EXP field on the first network egress.

  B. The EXP bits are set on the first network egress, based on a combination of the SAP-ingress classification and the network policy applied.

  C. The 3 priority bits are copied directly from the dot1p header into the EXP field of the first MPLS header.

  D. The EXP bits are set based on a default map that translates DSCP codes into internal forwarding classes on SAP-ingress.

  Correct Answer: AB

• Question 129:

  Click the exhibit button below.

  

  All interfaces are using their default trust states and MPLS is used as the transport tunnel. The SAP-ingress, SAP-egress, and network QoS policies have been configured as shown below. Assume that the default network-queue policy is used on each router.

  At router PE 1, customer traffic is arriving marked with DSCP BE and tagged with a dot1p value of 3.

  Based on the configuration shown below for the VPRN service, what will be the DSCP and dot1p marking for the packet egressing at router PE 2? (Choose two)

  A. The DSCP value will be set to af21.

  B. The DSCP value will be set to be.

  C. TheDSCPvaluewillbesettoaf23.

  D. The DSCP value will be set to af 12.

  E. Thedot1pvaluewillbesetto5.

  F. Thedot1pvaluewillbesetto2.

  G. The dot1p value will be set to 3.

  Correct Answer: DE

• Question 130:

  Click the exhibit button below.

  

  At router PE1, customer packets are arriving tagged with a dotlp value of 6 and marked with a DSCP value of EF.

  Based on the configuration shown below for a VPLS service, what will be the DSCP and EXP marking for the packet egressing the network port on this PE router? (Choose two)

  A. The DSCP value will be set to af21.

  B. The DSCP value will be set to af23.

  C. The DSCP value will remain as ef.

  D. The EXP value, in the MPLS headers, will be set to 4.

  E. The EXP value, in the MPLS headers, will be set to 3.

  Correct Answer: CE