Nokia Quality of Service 4A0-107 Dumps Updated (V11.02) – Beneficial Learning Material for Preparation

1. The IP ToS field consists of ________ bits, of which ________are used. The _________most significant (first) bits define precedence.

2. Which of the following are examples of metrics for QoS?

3. What is the 6-bit binary representation of DSCP value AF21?

4. Which of the following statements regarding DSCP bits are TRUE? (Choose three)

5. Which of the following can be used as classifiers of customer traffic? (Choose three)

6. Which of the following are characteristics of DSCP? (Choose two)

7. What is an SLA? (Choose two)

8. How many bits does DSCP use to provide QoS marking options?

9. Which of the following are major components of QoS functionality on the Nokia 7750 SR? (Choose three)

10. Which of the following are characteristics of 802.1p? (Choose two)

11. Which of the following BEST describes a SAP when regarding QoS?

12. Individual application streams are considered microflows, whereas __________ are considered macroflows.

13. What is the maximum number of SAP-ingress policies that can be applied on a SAP?

14. Click the exhibit button below.

Based on the configuration shown below, name the forwarding class to be associated with a TCP packet encapsulated inside an Ethernet frame that arrives on SAP 1/1/5 with the following characteristics:

Destination IP address = 120.110.1.1

TCP port number = 23

DSCP value = nc1

Dot1pvalue = 3

15. Which of the following are possible criteria for classifying packets at the network port ingress on the Nokia 7750 SR? (Choose three)

16. A default network policy is applied to all router interfaces associated with network ports.

17. Which of the following are NOT ingress matching criteria for a network policy? (Choose two)

18. Click the exhibit button below.

A partial SAP-ingress policy configuration is shown below. A UDP video stream is sent to a PC with IP address 192.168.1.100.

Given the SAP-ingress policy, to which forwarding class is the traffic matched?

19. On an Nokia IOM 3, how is buffer memory allocated per forwarding complex?

20. WRED can be used to help avoid TCP slow-start synch problems.

21. What is the maximum number of forwarding subclasses a forwarding class can have?

22. Click the exhibit button below.

Given the slope-policy (below), which of the following statements are TRUE? (Choose two)

23. Click the exhibit button below.

Given the SAP-ingress policy, which of the following statements are FALSE? (Choose three)

24. Which of the following should be performed if a service provider does not want packets to make use of the shared buffer space when queued?

25. Which of the following statements BEST describes an MBS parameter?

26. How many queues are available for use on service egress within a VPLS service?

27. If traffic is destined to queue 5, which has a high-priority-only value of 0 in the network-queue policy, all out-of-profile packets will be dropped.

28. On the Nokia 7750 SR, where can network-queue policies be applied? (Choose two)

29. Click the exhibit button below.

Given the output of the #show pools 1/2/2 network-egress command on a GigE port, what can the service provider deduce? (Choose two)

30. A queue is configured with the following attributes:

MBS = 10KB

CBS = 5KB

High-Priority-Only = 20%

Assume that there is no CBS overbooking and that the slope-policy is disabled.

If the current queue depth is 3KB, what will happen to an out-of-profile packet arriving at an egress queue?

31. A physical port has three associated buffer pools.

Which of the following buffer pool combinations is associated to a physical port?

32. Which of the following are the minimum requirements needed to classify traffic marked with DSCP AF11, AF12, and AF13 into the AF forwarding class and provide fair treatment to the drop precedence settings? (Choose three)

33. Forwarding subclasses are only relevant to, and are therefore applied within the context of, a _____________policy.

34. To manage the shared buffer space at network ports, slope policies are applied on _________ for the ingress direction, and on ________ or _________ for the egress direction.

35. Click the exhibit button below.

A service provider has applied the SAP-ingress policy configuration below on his customer's SAP. The service provider notices that all of the customer's traffic is being dropped at the SAP-ingress.

Which of the following actions can resolve the problem, if applied on its own? (Choose three)

36. Click the exhibit button below.

Given the scheduler-policy (below), how much bandwidth can the best-effort traffic receive (PIR and CIR) when the ingress rate of each queue is 10Mbps?

37. In the context of hierarchical scheduling, a scheduler is configured with a CIR weight of 0.

Which of the following statements is TRUE?

38. Which of the following statements describe the primary objectives of the policing of traffic flows on the Nokia 7750 SR? (Choose two)

39. Which of the following entities can scheduler policies be applied to? (Choose two)

40. It is necessary for Tier 1 schedulers to obtain bandwidth from a higher tier scheduler.

41. In which of the following scenarios is the egress port scheduler useful? (Choose two)

42. Policing improves bandwidth utilization by using buffering to absorb high bursts of traffic.

43. On the Nokia 7750 SR, which of the following QoS-related policies can be configured on a SAP? (Choose three)

44. Which of the following statements BEST describes where shaping mechanisms should be applied?

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

46. Which of the following statements regarding the egress port scheduler is TRUE?

47. Traffic assigned to forwarding classes is placed into queues, while the contents of the queues are serviced in a controlled manner using____________.

48. To implement Hierarchical-QoS (Multi-tiered scheduling), which of the following actions must be undertaken? (Choose three)

49. Which of the following statements regarding policing and shaping on the Nokia 7750 SR are TRUE? (Choose two)

50. Click the exhibit button below.

Given this scheduler-policy configuration, which of the following can be said about the scheduler called "high"? (Choose two)

51. At which points can traffic be marked or remarked on the Nokia 7750? (Choose two)

52. Which of the following statements regarding egress FC and profile over-ride are TRUE? (Choose two)

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

54. 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)

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

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

57. 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?

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

59. 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.

60. 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)

61. Which of the following statements BEST defines policing?

62. Without_______, a customer's high priority traffic can be dropped before its low priority traffic.

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

64. Click the exhibit button below.

A network operator has configured the SAP-ingress policy below. Ping traffic is expected in queue 3. However, the network operator notices that all traffic is placed in queue 1.

What is the most probable reason for this?

65. Which of the following are possible criteria for classifying packets at the SAP-ingress? (Choose three)

66. Which of the following statements is considered best practice when changing a network policy that has been associated with an interface?

67. Which of the following statements regarding buffer pool allocation are FALSE? (Choose two)

68. Click the exhibit button below.

Given the SAP-ingress policy, which of the following statements are TRUE? (Choose three)

69. On the Nokia 7750 SR, what is a slope policy used for?

70. On the Nokia 7750 SR, how many queues per FC are available for multipoint traffic within a VPLS on service ingress?

71. A queue is configured with the following attributes:

MBS = 10KB

CBS = 5KB

High-Priority-Only = 30%

Assume that there is no CBS overbooking and that the slope-policy is disabled.

If the current queue depth is 8KB, what will happen to an in-profile packet arriving in the queue?

72. Click the exhibit button below.

Each router is interconnected by a single GigE link, as shown in the diagram below.

Note: The arrows show the direction of traffic flow.

Traffic from Customer A and Customer B that is classified to the same forwarding class is queued together at the ingress of Router B.

73. 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)

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

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

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

77. 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)

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

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

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

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

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

83. 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)

84. 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)

85. When deploying an Nokia MPLS network with QoS, how are the EXP bits set?

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

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

88. 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.

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

90. 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?

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

92. 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).

93. Which of the following statements are TRUE regarding the PE device in a QoS enabled network? (Choose two)

94. On the Nokia 7750 SR, what is the maximum number of queues that a single SAP-ingress policy can support in a VPLS?

95. Click the exhibit button below.

A network operator has configured a network-queue policy to map forwarding classes to queues, as shown in the exhibit below.

Based on the default scheduling behavior of the Nokia 7750 SR, in which order will packets be serviced?

96. Which of the following statements regarding scheduling are TRUE? (Choose two)

97. Which of the following statements regarding the default scheduler in the Nokia 7750 SR are TRUE? (Choose two)

98. Click the exhibit button below.

Based on the configuration of the network policy (below), what will be the forwarding class associated with a MPLS encapsulated customer packet that arrives on a dotlQ encapsulated network port 1/1/4:1 on P1 with the following characteristics:

EXP value = 6

DSCP value = cs1

Dot1pvalue = 3

99. How does an IOM3 improve the queue usage over an IOM2 in an Nokia 7750 SR? (Choose two)

100. Which of the following statements BEST describes the IntServ model?