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

Demo: 34 questions
Total 231 questions
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Nokia Quality of Service Questions and Answers

Question 1

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

Options:

A.

The EXP bits in the MPLS header.

B.

The packet's source and destination IP addresses.

C.

The packet's DSCP bits.

D.

The dot1p bits in the frame header.

E.

The ID of an SDP that is transporting the packet.

Question 2

Which of the following is NOT an adaptation rule supported on the Nokia 7750 SR for calculating the operational CIR/PIR of a queue?

Options:

A.

Closest

B.

Average

C.

Min

D.

Max

Question 3

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?

Options:

A.

0

B.

3

C.

6

D.

22

Question 4

Which of the following statements about buffer admission control techniques is FALSE?

Options:

A.

A packet is accepted into a queue based on its priority and forwarding class.

B.

Buffer admission control limits the number of out-of-profile packets that enter the queue.

C.

Both high priority-only buffer space and WRED can be used in a queue.

D.

Priority is used when a packet enters a SAP-ingress queue.

Question 5

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

Options:

A.

1st

B.

8th

C.

9th

D.

17th

Question 6

A physical port has three associated buffer pools. Which of the following buffer pool combinations is associated to a physical port?

Options:

A.

Access ingress, access egress, network egress

B.

Access ingress, network ingress, network egress

C.

Port ingress, port egress, shared bi-directional

D.

Port ingress, port egress, network egress

E.

Port ingress, network ingress, network egress

Question 7

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 8

Which of the following about scheduling is TRUE?

Options:

A.

HQoS schedulers cannot be children of an egress port-scheduler.

B.

HQoS schedulers provide a dynamic method of allocating scheduling resources to queues.

C.

HQoS scheduler policies can be applied to an MDA to schedule network ingress traffic.

D.

A scheduler policy applied to multiple SAPs within the same service will result in a single hardware scheduler operating across all SAPs within the service.

Question 9

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

Options:

A.

The egress port scheduler can have up to 17 children spread across 8 levels.

B.

Multiple egress port schedulers can be assigned to a single port with many HQoS children.

C.

Multiple HQoS policies can be children of a single port scheduler.

D.

Multiple egress port schedulers can be children of a single HQoS scheduler.

Question 10

Given the scheduler-policy parameters shown, and assuming the offered rate of each queue is 10 Mbps, what are the operational PIR and CIR for queue 3?

Options:

A.

PIR = 4 Mbps, CIR = 1 Mbps

B.

PIR = 1 Mbps, CIR = 1 Mbps

C.

PIR = 10 Mbps, CIR = 1 Mbps

D.

PIR = 5 Mbps, CIR = 1.25 Mbps

E.

PIR = 1.25 Mbps, CIR = 1.25 Mbps

Question 11

Which of the following egress points does NOT support egress reclassification?

Options:

A.

Spoke-SDPs bound to an IES

B.

Spoke-SDPs bound to a VPRN interface

C.

SAPs

D.

Network interfaces

Question 12

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

Options:

A.

3

B.

64

C.

72

D.

16

E.

56

Question 13

Which ports on the same MDA share a buffer pool in a Nokia 7750 SR?

Options:

A.

Access ingress ports

B.

Access egress ports

C.

Network ingress ports

D.

Network egress ports

Question 14

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

Options:

A.

DSCP is part of the Layer 3 header.

B.

DSCP is a 6-bit field.

C.

DSCP specifies eight different priorities.

D.

DSCP specifies four precedence levels.

E.

DSCP is part of the Layer 2 header

F.

DSCP specifies 128 different per-hop behaviors.

Question 15

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?

Options:

A.

PIR = 4Mbps. CIR = 1Mbps

B.

PIR = 1Mbps, CIR = 1 Mbps

C.

PIR = 10Mbps, CIR = 1Mbps

D.

PIR = 5Mbps, CIR = 1.25Mbps

E.

PIR = 1.25Mbps, CIR = 1.25Mbps

Question 16

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.

Options:

A.

True

B.

False

Question 17

Which of the following self-generated traffic applications is considered “management” traffic, as opposed to “protocol” traffic?

Options:

A.

IS-IS

B.

RSVP

C.

ICMP

D.

BGP

Question 18

Which of the following statements about network QoS policies is FALSE?

Options:

A.

Classification rules must specify both an FC and a profile for the packets.

B.

A network policy is applied at a physical port.

C.

Classification is performed with behavior-aggregate statements only.

D.

Match criteria can be chosen from dot1p, DSCP, and EXP fields in the packet.

Question 19

If packets egressing a SAP do not match any criteria defined in the SAP-egress policy, which forwarding class will these packets be assigned to?

Options:

A.

The default forwarding class defined in the SAP-egress policy.

B.

The forwarding class inherited from network ingress classification.

C.

Best Effort.

D.

If there is no match, packets will be dropped.

Question 20

Which of the following statements about behavior aggregate classification is TRUE?

Options:

A.

It sets both the forwarding class and the packet’s dot1p, lsp-exp, precedence, or dscp field to the same value.

B.

It groups all packets together into a single aggregate stream, and gives all packets the same treatment.

C.

It copies the three most significant bits in the packet’s dscp field into the forwarding class.

D.

It assigns a forwarding class based on the packet’s dot1p, lsp-exp, precedence, or dscp value.

Question 21

Which of the following criteria is NOT used in the behavior aggregate classification option?

Options:

A.

dot1p

B.

dst-mac

C.

lsp-exp

D.

dscp

Question 22

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 23

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

Options:

A.

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

B.

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

C.

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

D.

Policing can be deployed instead of queuing at ingress.

Question 24

On a 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 25

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 26

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?

Options:

A.

All in-profile packets in round-robin, then all out-of-profile packets in biased round-robin.

B.

In-profile EF packets, then in-profile H2 packets, then in-profile AF packets, then out-of-profile EF packets, then out-of-profile H2 and AF packets, and then out-of-profile BE packets.

C.

In-profile EF, H2 and AF packets, then out-of-profile H2, AF and BE packets in biased round-robin.

D.

In-profile EF packets, then in-profile H2 and AF packets, then out-of-profile H2, AF and BE packets in biased round-robin.

E.

In-profile EF and H2 packets, then in-profile AF packets, then out-of-profile H2, AF and BE packets in biased round-robin.

Question 27

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)

Options:

A.

The DSCP value will be set to af21.

B.

The DSCP value will be set to af23.

C.

The DSCP value will remain as ef.

D.

The EXP value, in the MPLS headers, will be set to 4.

E.

The EXP value, in the MPLS headers, will be set to 3.

Question 28

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

Options:

A.

010011

B.

100010

C.

010001

D.

001100

E.

010010

Question 29

In the diagram shown above, applying policing and soft-policing on access ingress is typical for which of the following types of traffic?

Options:

A.

Real-time

B.

Assured

C.

Best-effort

D.

Self-generated

Question 30

Click the exhibit button below. Given the SAP-ingress policy, which of the following statements are TRUE? (Choose three)

Options:

A.

All AF traffic will be marked "in-profile" at the SAP-ingress.

B.

All TCP traffic will be mapped to forwarding class EF.

C.

UDP traffic is placed in queue 3 while ICMP traffic is placed in queue 5.

D.

EF traffic will receive higher scheduling priority than H2 traffic.

E.

Traffic that does not match any of the IP criteria will be placed in queue 3.

Question 31

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

Options:

A.

Router interfaces

B.

Ingress MDA

C.

Ingress Ethernet network ports

D.

Egress Ethernet network ports

E.

Service SAPs

Question 32

In a Nokia 7750 SR, which of the following QoS policies CANNOT include packet classification criteria?

Options:

A.

SAP-ingress

B.

SAP-egress

C.

Network-queue

D.

Network

Question 33

By default, how does a hybrid port on a Nokia 7750 SR share its allocated buffer space between access and network pools?

Options:

A.

All buffer space is initially allocated to access pools, and some of it is reallocated to network pools if network interfaces are configured on it.

B.

All buffer space is initially allocated to network pools, and some of it is reallocated to access pools if service SAPs are configured on it.

C.

Buffer space is allocated 50% for access pools and 50% for network pools.

D.

Buffer space is allocated 25% for access pools and 75% for network pools.

Question 34

At which point are internal QoS markings added to the packets?

Options:

A.

SAP-ingress

B.

FFPC

C.

SAP-egress

D.

network-egress

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Demo: 34 questions
Total 231 questions
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