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Nokia 4A0-107 Nokia Quality of Service Exam Practice Test

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Total 231 questions
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Nokia Quality of Service Questions and Answers

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Question 1

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.

Options:

A.

Interfaces, ports, SAPs

B.

Ports, ports, MDAs

C.

MDAs, MDAs, ports

D.

Interfaces, interfaces. MDAs

E.

MDAs, ports, interfaces

Question 2

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

Options:

A.

WRED

B.

shapers

C.

schedulers

D.

markers

E.

weighted fair queues (WFQ)

Question 3

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.

Options:

A.

TRUE

B.

FALSE

Question 4

Which action does the packet remarking process perform?

Options:

A.

It determines the packet’s forwarding class based on classification criteria

B.

It modifies the current packet’s forwarding class to indicate promotion or demotion

C.

It sets the TOS, DSCP, EXP, or Dot1p field based on classification criteria

D.

It modifies the current TOS, DSCP, EXP, or Dot1p marking to indicate promotion or demotion

Question 5

Which of the following statements defines the committed information rate?

Options:

A.

It is the rate at which a traffic stream is offered to a queue.

B.

It is the rate at which packets are forwarded out of a queue.

C.

It is the minimum rate at which packets may be forwarded out of a queue.

D.

It is the maximum rate at which packets may be forwarded out of a queue.

Question 6

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

Options:

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."

Question 7

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

Options:

A.

Real-time

B.

Assured

C.

Non-conforming

D.

High priority

E.

In-profile

Question 8

For which of the following queues does a Nokia 7750 SR allocate a separate hardware queue per each destination fast forward path complex (FFPC)?

Options:

A.

An egress unicast queue defined in a network queue policy

B.

An ingress unicast queue defined in a SAP-ingress policy

C.

An ingress multipoint queue defined in a SAP-ingress policy

D.

An ingress multipoint queue defined in a network queue policy

Question 9

Where is a QoS network queue policy applied?

Options:

A.

Ingress SAP or egress SAP

B.

Egress port or ingress MDA

C.

Egress MDA or ingress network interface

D.

Egress network interface or ingress MDA

Question 10

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

Options:

A.

The slope-policy

B.

The SAP-ingress policy

C.

The SAP-egress policy

D.

The network-queue policy

E.

The scheduler-policy

Question 11

Which parameter can be configured in a network ingress QoS policy?

Options:

A.

The priority (low/high) to be assigned to the packets.

B.

The profile (in/out) to be assigned to the packets.

C.

The queues to be assigned to the forwarding classes.

D.

The markings to be marked on the packets.

Question 12

Which of the following is NOT a characteristic of policing?

Options:

A.

It smooths out traffic bursts.

B.

It drops the packets when average peak rate is exceeded.

C.

It may additionally color the packets as they arrive.

D.

It buffers the packets at its output before sending them out.

Question 13

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

Options:

A.

8

B.

3

C.

4

D.

5

E.

6

Question 14

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

Options:

A.

010011

B.

100010

C.

010001

D.

001100

E.

010010

Question 15

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

Options:

A.

There are a maximum of 8 levels of priority serviced using a round-robin algorithm.

B.

The default scheduler will spend an equal amount of time in each queue, as long as there is traffic present

C.

The H1 internal forwarding class will receive its CIR before AF traffic.

D.

Orphaned queues will be scheduled out of the BE queue.

E.

A queue servicing EF and AF traffic will require explicit configuration to set the queue to expedited.

Question 16

How is buffer memory allocated per forwarding complex on a Nokia FP3-based IMM?

Options:

A.

512 MB ingress, 512 MB egress

B.

512 MB for network ports, 512 MB for access ports

C.

3.84 GB dynamically allocated between ingress and egress

D.

2 GB, with a minimum of 512 MB ingress and egress, and an additional 1 GB dynamically allocated

Question 17

Both SAP-ingress 10 and policer-control-policy “CFHP” have been applied to a service SAP ingress.

What is the maximum bandwidth allocated to policer 2?

Options:

A.

10000 Kbps

B.

15000 Kbps

C.

20000 Kbps

D.

30000 Kbps

Question 18

Which of the following statements about scheduling on the Nokia 7750 SR is FALSE?

Options:

A.

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

B.

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

C.

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

D.

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

Question 19

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

Options:

A.

TRUE

B.

FALSE

Question 20

Which of the following statements about marking packets is TRUE?

Options:

A.

Packets corresponding to a layer-2 service can be pre-marked on SAP-ingress.

B.

Packets corresponding to a layer-2 service can be pre-marked on network-ingress.

C.

Packets corresponding to a layer-3 service can be pre-marked on SAP-ingress.

D.

Packets corresponding to a layer-3 service can be pre-marked on network-ingress.

Question 21

Which priority-mode queue parameter may influence both the profile marking, and scheduling priority of a queue?

Options:

A.

PIR

B.

CIR

C.

MBS

D.

burst-limit

Question 22

A queue-group template can contain both queues and policers when applied under which conditions?

Options:

A.

When applied at the port level for access ingress.

B.

When applied at the FP (Forwarding Pass) level for access ingress.

C.

When applied at the FP (Forwarding Pass) level for network ingress.

D.

When applied at the port level for network egress.

Question 23

In the context of hierarchical scheduling, a scheduler is configured with a CIR weight of 0. Which of the following statements is TRUE?

Options:

A.

The scheduler will be allocated its "within CIR" bandwidth before all other children at the same level have received their "within CIR" bandwidth.

B.

The scheduler will be allocated its "within CIR" bandwidth after all other children at the same level have received their "within CIR" bandwidth.

C.

The scheduler will be allocated its "within CIR" bandwidth after all other children at all levels have received their "within CIR" bandwidth.

D.

The scheduler will not be allocated its "within CIR" bandwidth.

Question 24

When we select the adaptation rule “min”, how are the operational CIR/PIR rates of a queue calculated?

Options:

A.

The administrative PIR values are ignored and both operational rates are set to the minimum residual rate allowed by the hardware.

B.

The administrative PIR value is ignored and both operational rates are set to the administrative CIR value.

C.

They are chosen as the largest multiple of the hardware rate step that is less than or equal to the corresponding CIR/PIR administrative value.

D.

They are chosen as the smallest multiple of the hardware rate step that is greater than or equal to the corresponding CIR/PIR administrative value.

Question 25

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?

Options:

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.

Question 26

Which of the following statements about a SAP-ingress policy is FALSE?

Options:

A.

It maps customer traffic to forwarding classes on ingress.

B.

It can use customer QoS markings to do the mapping.

C.

The default SAP-ingress policy classifies all traffic into FC “be” with low priority.

D.

It serves the classification, queuing, and marking functions of QoS but does not serve scheduling

Question 27

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

Options:

A.

16

B.

8

C.

32

D.

48

E.

56

Question 28

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

Options:

A.

512 MB ingress, 512 MB egress

B.

256 MB ingress, 256 MB egress

C.

1 GB dynamically allocated between ingress and egress.

D.

768 MB dynamically allocated between ingress and egress.

E.

768 MB, with a minimum of 256 MB ingress and egress, and an additional 256 MB dynamically allocated.

Question 29

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

Options:

A.

8

B.

3

C.

4

D.

5

E.

6

Question 30

Which of the following CANNOT be used as external marking bits?

Options:

A.

IP Precedence

B.

Dot1p

C.

Forwarding class

D.

EXP

Question 31

Which of the following are examples of metrics for QoS?

Options:

A.

Signal degradation, attenuation, line loss

B.

Latency, FIFO, WRED

C.

Delay, jitter, packet loss

D.

SNR, queue depth, latency

E.

Attenuation, dispersion, latency

Question 32

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

Options:

A.

64

B.

8

C.

3

D.

16

E.

1

Question 33

Which of the following fields is in the MPLS header?

Options:

A.

802.1p bits

B.

Precedence

C.

DSCP

D.

EXP

Question 34

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?

Options:

A.

Set the CBS to 0.

B.

Set the MBS equal to the CBS.

C.

Set the high-priority-only equal to the MBS.

D.

Set the MBS to 0.

E.

Set the high-priority-only to 0.

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