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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

Question 1

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

Options:

A.

Policing, expedited

B.

Metering, marked discard eligible

C.

Marking, marked discard eligible

D.

Policing, discarded

E.

Shaping, discarded

Question 2

How does a shaper rate-limit a traffic stream?

Options:

A.

Packets that arrive in a burst are immediately dropped; packets that arrive with the proper in between space are immediately.

B.

Packets are buffered on arrival and are forwarded at an average rate conforming with PIR, typically, with a reduced burstiness.

C.

Packets with an average arrival rate higher than PIR are immediately dropped; conforming packets are forwarded at the same rate at which they arrive.

D.

Packets with an average arrival rate higher than PIR are buffered for future processing; conforming packets are immediately forwarded.

Question 3

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 4

Which of the following statements about a queue’s rate parameters is FALSE?

Options:

A.

If CIR = PIR, then all packets will be considered as in-profile.

B.

CIR can be set to 0.

C.

CIR can be larger than PIR.

D.

CIR can be set to ‘max’.

Question 5

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

Question # 5

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.

Options:

A.

True

B.

False

Question 6

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 7

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

Options:

A.

An IES SAP

B.

A VPLS SAP

C.

A network port

D.

AVPRN SAP

E.

An access port

Question 8

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 9

Question # 9

According to the configuration shown above, which of the following about the classification and marking of self- generated BGP traffic is TRUE?

Options:

A.

It will be marked as DSCP BE and classified into forwarding class BE.

B.

It will be marked as DSCP NC1 and classified into forwarding class BE.

C.

It will be marked as DSCP NC1 and classified into forwarding class NC.

D.

It will be marked as DSCP NC1 and classified into forwarding class AF.

Question 10

According to the configurations shown, which of the following statements about the classification and queuing of self-generated OSPF traffic is TRUE?

Question # 10

Options:

A.

It will be classified into forwarding class BE and stored in queue 1.

B.

It will be classified into forwarding class BE and stored in queue 8.

C.

It will be classified into forwarding class NC and stored in queue 1.

D.

It will be classified into forwarding class NC and stored in queue 8.

Question 11

Which of the following statements about CIR of a queue is TRUE?

Options:

A.

It may exceed PIR of the queue.

B.

It may be exceeded by the average servicing rate of the queue.

C.

It varies depending on the traffic characteristics.

D.

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

Question 12

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 13

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 14

Packets enter the network via the ePipe SAP on PE1 with dot1p marking of 6. The VC type of the SDP interconnecting PE1 and PE2 is vlan. All network interfaces use the default network QoS policy. According to the configuration shown above, what is the inner dot1p value of the BE traffic egressing router PE2?

Question # 14

Options:

A.

0

B.

3

C.

6

D.

22

Question 15

Question # 15

In the image shown above, the network QoS policy is applied properly to a Nokia 7750 SR. An MPLS packet with dot1p=1, EXP=4, and DSCP=AF is received. Which forwarding class and profile is assigned to this packet?

Options:

A.

EF, in

B.

H1, out

C.

BE, out

D.

L1, in

Question 16

Assume all transmitted frames on a SONET port are 1500 bytes and that the average frame overhead has been configured as 10%. If the total bandwidth of all queues, excluding overhead, needs to be guaranteed at 55 Mbps, how much bandwidth should be configured for the egress port scheduler applied on that port?

Options:

A.

55 Mbps / 1.1 = 50 Mbps

B.

55 Mbps

C.

55 Mbps + 55 Mbps * 0.1 / 1.1 = 60 Mbps

D.

55 Mbps * 1.1 = 60.5 Mbps

Question 17

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 18

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 19

Click the exhibit button below.

Question # 19

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)

Options:

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.

Question 20

Which of the following statements about behavior aggregate and multi-field classification in a Nokia 7750 SR is TRUE?

Options:

A.

Multi-field classification can use both MAC criteria and IP criteria in the same SAP-ingress QoS policy.

B.

Behavior aggregate classification can use both lsp-exp and dscp in the same SAP-ingress QoS policy.

C.

Multi-field classification cannot use both IP criteria and IPv6 criteria in the same SAP-ingress QoS policy.

D.

Behavior aggregate classification cannot use both dot1p and lsp-exp in the same SAP-ingress QoS policy.

Question 21

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

Options:

A.

Microflow reservations using RSVP

B.

DSCP to EXP translation

C.

Traffic classification

D.

Automatic profiling and policy configuration

E.

Buffer memory management

F.

Traffic scheduling

Question 22

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

Options:

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.

Question 23

Which of the following statements describes an advantage of the DiffServ QoS model over the IntServ QoS model?

Options:

A.

DiffServ reserves resources dynamically using the RSVP protocol.

B.

DiffServ only requires packets to be classified into forwarding classes at the first network hop.

C.

DiffServ provides granular differentiation and superior fairness because it processes traffic streams individually.

D.

DiffServ is more scalable it treats traffic streams as aggregates.

Question 24

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

Options:

A.

The larger the configured MBS value, the lower the amount of shaping performed.

B.

When policing is enabled on the SAP-ingress, all traffic is considered as in-profile.

C.

Setting the CIR to 1000 and the PIR to max will enable shapeless policing at 1 Mbps within the SAP-egress policy.

D.

Configuring MBS to equal CBS will disable shaping.

E.

Setting the CIR and PIR to equal values disables soft-policing.

Question 25

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

Options:

A.

A customer is complaining that his VoIP traffic is being dropped even though it is sending the correct DSCP markings. Packets are not being dropped on ingress.

B.

A customer is complaining that his VoIP traffic is being dropped even though it is sending the correct DSCP markings. Packets are being dropped on ingress.

C.

A commercial builder has requested numerous dot1Q epipes, VPRNs, and VPLS services to a business park and is only paying up to a maximum 200Mbps.

D.

An equipment manufacturer has requested a NULL epipe service that will transparently pass dot1Q between the new location and national headquarters.

Question 26

Question # 26

According to the SAP-ingress QoS policy shown, what is the maximum amount of memory that queue 5 can use from the shared buffer pool?

Options:

A.

1 kilobyte

B.

2 kilobytes

C.

10 kilobytes

D.

20 kilobytes

Question 27

Which of the following statements BEST defines policing?

Options:

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.

Question 28

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

Options:

A.

SAP-ingress only

B.

SAP-egress only

C.

SAP-ingress and SAP-egress

D.

Network ingress

E.

Network egress

Question 29

According to the SAP-egress policy configured and applied, which queue will forwarding class AF’s traffic use?

Question # 29

Options:

A.

Policer 2 on the queue-group Q-Group1 instance 1.

B.

Policer 1 on the queue-group Q-Group1 instance 1.

C.

The default policer 1.

D.

AF traffic is dropped.

Question 30

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)

Question # 30

Options:

A.

Set the CIR of queue 3 to a non-zero value corresponding to the customer's expected bandwidth requirements.

B.

Set queue 3 to use priority mode.

C.

Set the traffic classification of packets to in-profile.

D.

Set the high-priority-only value to 0.

E.

Map AF traffic to queue 1

Question 31

Which of the following statements about the token buckets of a policer is TRUE?

Options:

A.

When a packet arrives, the PIR bucket depth is checked and the packet is discarded if this bucket is full.

B.

The CIR bucket of a policer is the reserved portion of its PIR bucket.

C.

The CIR bucket of a policer has two thresholds: CBS and HPO.

D.

Packets processed by the PIR bucket at an average rate above PIR will be forwarded as out-of-profile.

Question 32

Which action should be taken to ensure that packets do not use the shared buffer space when put into a queue?

Options:

A.

Set the queue’s CBS to 0

B.

Set the queue’s MBS equal to the CBS

C.

Set the queue’s high-priority-only equal to the MBS

D.

Set the queue’s MBS to 0

E.

Set the queue’s high-priority-only to 0

Question 33

Which of the following statements about configuring queues to use shared or reserved buffer space is FALSE?

Options:

A.

When queues use shared buffer space, buffers are more efficiently utilized.

B.

Queues that use reserved buffer space will have memory available for their reserved portion.

C.

When a queue is not using its reserved portion, other queues can use it.

D.

Using reserved buffer space prevents a queue from being starved of buffer resources by other queues.

Question 34

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.

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