Nokia Quality of Service (4A0-107) Free Practice Test

Question 1

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

A. It can only have queues as children.

B. It is a child scheduler.

C. It is the top-level scheduler.

D. It is a parent scheduler.

E. It can allocate up to 50 Mbps of bandwidth to scheduler "low" since the bandwidth is not used by another Tier 3 scheduler.

Correct Answer: B,D

Question 2

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

A. 8

B. 56

C. 48

D. 16

E. 32

Correct Answer: E

Question 3

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

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

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

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

Correct Answer: B,D

Question 4

Which of the following traffic types is typically rate-limited by applying shaping and soft-policing on access ingress?

A. Real-time

B. Assured

C. Self-generated

D. Best-effort

Correct Answer: D

Question 5

While deciding how to share the available bandwidth among its children, when does a port scheduler consider the parameter "level" of a child?

A. During the allocation of both within-CIR and above-CIR bandwidth.

B. During the allocation of within-CIR bandwidth.

C. During the allocation of above-CIR bandwidth.

D. The port scheduler does not use the level of a child for making bandwidth allocation decisions

Correct Answer: C

Question 6

An IOM3 card of a Nokia7750 SR is enabled with the default scheduler and the policy shown in the image is applied to an access port on this card. In which order will packets be scheduled out of the queues?

A. Queue 4 within-CIR packets, then queue 3 within-CIR packets, then queue 3 and queue 4 above-CIR packets in round-robin.

B. Queue 4 within-CIR packets, then queue 3 within-CIR packets, then queue 4 above-CIR packets, and finally queue 3 above-CIR packets.

C. Queue 3 within-CIR packets, then queue 4 within-CIR packets, then queue 3 above-CIR packets, and finally queue 4 above-CIR packets.

D. Queue 3 within-CIR packets, then queue 4 within-CIR packets, then queue 3 and queue 4 above-CIR packets in round-robin.

Correct Answer: A

Question 7

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

A. Q-in-Q

B. ToS

C. DSCP

D. Dot1p

E. PREC

Correct Answer: D

Question 8

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?

A. BE

B. AF

C. H2

D. H1

E. EF

Correct Answer: E

Question 9

Which of the following statements BEST describes the IntServ model?

A. Has the ability to distinguish traffic in 32 different ways.

B. Has the ability to manually configure foiwarding classes through a network.

C. Uses the RSVP protocol to create macroflows through a network.

D. Uses the RSVP protocol to create microflows through a network.

Correct Answer: D

Question 10

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

A. DSCP is a 6-bit field.

B. DSCP is part of the Layer 3 header.

C. DSCP specifies eight different priorities.

D. DSCP is part of the Layer 2 header

E. DSCP specifies 128 different per-hop behaviors.

F. DSCP specifies four precedence levels.

Correct Answer: A,B

Question 11

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

A. L1

B. L2

C. H2

D. H1

E. EF

Correct Answer: C

Question 12

Which of the following features of the Nokia 7750 SR prevents Head of Line blocking in the default queuing model?

A. A 3-tier scheduling policy can be applied at SAP-ingress/SAP-egress.

B. For each unicast queue in a SAP-ingress or network-queue policy, there is a separate hardware queue for each destination FFPC.

C. Policing can be deployed instead of queuing at ingress.

D. Every forwarding class can be associated with its own queue without sharing with other forwarding classes.

Correct Answer: B

Question 13

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

A. A point in the network where QoS parameters are discarded in favor of lower-level hardware queuing functions, such as LLI (Link Layer Interleave).

B. A point at which the initial classification of customer traffic occurs.

C. A point in the network where EXP bits can be mapped to one of eight predefined FCs, each one with its own queue.

D. A logical point in a service tunnel where all of customer traffic is aggregated.

E. A point in the network where traffic flows from multiple different services are queued together, based on forwarding class.

Correct Answer: B

Question 14

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)

A. 3 forwarding classes

B. Priority mode queues

C. 1 forwarding class, with 3 subclasses

D. 1 queue

E. Profile mode queues

F. 3 queues

G. 1 forwarding class, with 2 subclasses

Correct Answer: D,E,G

Welcome to TestSimulate

Nokia Quality of Service (4A0-107) Free Practice Test