Nokia Nokia Certifications 4A0-107 Questions & Answers

• Question 151:

  Which of the following statements are TRUE? (Choose two)

  A. The primary contributors to latency are distance, scheduling, and congestion.

  B. The weighted round robin scheduling algorithm will result in more delay for high priority traffic than the regular round robin algorithm.

  C. The round robin scheduling algorithm will result in less jitter for low priority traffic than a strict priority scheduler.

  D. Packet loss can be reduced by decreasing the amount of buffer space available to a queue.

  E. Latency can be reduced by increasing the amount of buffer space available to a queue.

  Correct Answer: AC

• Question 152:

  Which of the following statements BEST defines policing?

  A. The process of delaying packets within a traffic stream to have them conform to a defined traffic profile.

  B. The overall treatment of a defined subset of a customer's traffic within a DiffServ domain.

  C. The process of discarding packets within a traffic stream in accordance with the state of a meter to enforce a defined traffic profile.

  D. The action of setting the DiffServ codepoint of a packet prior to its entry into a downstream DiffServ domain.

  E. A specified algorithm or operation that is implemented in a node in order to realize one or more per-hop behaviors.

  Correct Answer: C

• Question 153:

  Which of the following statements are TRUE regarding the remarking of packets arriving on the network interface whose ToS-marking-state is set to trusted and remarking enabled on network egress? (Choose two)

  A. Native IP Packets will not be remarked.

  B. Native IP Packets will be remarked.

  C. Packets associated with a VPRN service on an upstream node will not be remarked.

  D. Packets associated with an ES service on an upstream node will be remarked.

  Correct Answer: BD

• Question 154:

  Click the exhibit button below. Traffic arriving at router PE 1 is marked with a dot1p value of 4. Given the network policies applied on the routers in the diagram below, what is the EXP value of packets arriving at router PE 2?

  

  Note: Only relevant portions of the network policy are shown.

  A. 2

  B. 3

  C. 5

  D. 6

  E. None of the above.

  Correct Answer: A

• Question 155:

  Which of the following statements are TRUE regarding the building of a QoS-enabled network? (Choose two)

  A. It is important that all packets are classified in the same way at all SAP-ingress points.

  B. Once a packet is classified to a forwarding class, it cannot change across the network.

  C. Packet enters a node will be treated as per the local hop's configured policy.

  D. Native IP packets entering a network port will be marked at the first network egress by default

  E. Native IP packets entering a network port will not be marked at the first network egress by default.

  F. Native IP packets entering a network port will be marked at the first network egress, regardless of the re-marking configuration.

  Correct Answer: CE

• Question 156:

  A packet is to be encapsulated inside an MPLS tunnel which consists of two MPLS headers at the first network egress. Which of the MPLS EXP fields will be marked?

  A. The EXP field in the bottom MPLS header will be marked.

  B. The EXP field in both the top and bottom MPLS headers will be marked.

  C. For Layer 2 services, the top MPLS header will be marked; for Layer 3 services, the bottom MPLS header will be marked.

  D. The EXP field in the top MPLS header will be marked.

  E. Neither the top nor the bottom EXP field will be marked since EXP remarking can only be done on the network ingress.

  Correct Answer: B

• Question 157:

  Which of the following statements are TRUE when discussing self-generated traffic QoS? (Choose two)

  A. In order to mark Layer 2 traffic, sgt-qos will set various ToS bits.

  B. DSCP bits can be set per application, per routing instance.

  C. The DSCP marking stays nc1 for all applications. Only the internal FC is manipulated across different applications.

  D. In order to mark Layer 2 self-generated traffic, network interfaces must be set to dot1Q.

  E. The internal forwarding class for self-generated traffic is set once and applied to the base router and all VPRN instances.

  Correct Answer: BD

• Question 158:

  In which of the following scenarios is self-generated traffic QoS (sgt-QoS) useful?

  A. EXP markings on transit control traffic are not set correctly.

  B. The priority of all self-generated traffic needs to be lowered to allow all other traffic to take precedence.

  C. The priority of various control packets requires special treatment throughout the network.

  D. The BGP process is consuming too many CPU cycles and is impacting OSPF performance.

  Correct Answer: C

• Question 159:

  A service provider is using GRE for his transport tunnel on the Nokia 7750 SR. How can traffic be marked as it traverses the service provider's network? (Choose two)

  A. Using dot1p bits of the 802.1q Ethernet frame header

  B. Using DSCP bits within the ToS field of the IP packet header.

  C. Using the IP precedence bits within the ToS field of the IP packet header.

  D. Using the CLP bit of the ATM cell header.

  E. Using the EXP bits of the MPLS transport label header.

  Correct Answer: AB

• Question 160:

  Which of the following are trusted boundaries, by default? (Choose two)

  A. An IES SAP

  B. A VPLS SAP

  C. A network port

  D. AVPRN SAP

  E. An access port

  Correct Answer: CD