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

Demo: 34 questions
Total 231 questions

Nokia Quality of Service Questions and Answers

Question 1

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 2

Which of the following is an advantage of using queue-groups on a service SAP?

Options:

A.

It enables CFHP.

B.

It more scalable than using policers.

C.

It allows a separate set of queues/policers for each VLAN on a port.

D.

It allows a set of queues to be shared among multiple SAPs.

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 the bandwidth allocation criteria used by an egress port scheduler is TRUE?

Options:

A.

The available bandwidth of the port is divided in a strict priority over its children.

B.

Expedited queues must be serviced before best-effort queues.

C.

Orphaned queues are serviced on the 8th scheduling priority.

D.

The configured CIR dictates the maximum port bandwidth that can be allocated during the within-CIR pass for that level.

Question 5

Which of the following statements BEST describes an MBS parameter?

Options:

A.

It specifies the maximum rate at which a queue can be serviced.

B.

It specifies the maximum depth of a queue beyond which packets will be dropped.

C.

It specifies the portion of a queue that is taken from the reserved buffer pool.

D.

It specifies the threshold beyond which only in-profile packets will be queued.

E.

It specifies the peak bandwidth that can be attained by the incoming traffic.

Question 6

Which of the following fields is in the MPLS header?

Options:

A.

802.1p bits

B.

Precedence

C.

DSCP

D.

EXP

Question 7

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

Options:

A.

SAP-ingress policy

B.

SAP-egress policy

C.

IP-criteria policy

D.

Network-queue policy

E.

Slope policy

F.

Network policy

Question 8

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

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 9

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 10

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)

Options:

A.

Using dot1p bits of the 802.1q Ethernet frame header

B.

Using DSCP bits within the ToS field of the IP packet header.

C.

Using the IP precedence bits within the ToS field of the IP packet header.

D.

Using the CLP bit of the ATM cell header.

E.

Using the EXP bits of the MPLS transport label header.

Question 11

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 12

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

Options:

A.

A device that provides no differentiation between customer traffic flows.

B.

A device that classifies and marks customer traffic.

C.

A device that uses MPLS EXP bits to differentiate between traffic flows.

D.

A device that creates macroflows towards the core from multiple customer sites.

E.

A device that passes macroflows while optionally changing QoS markings.

Question 13

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).

Options:

A.

TRUE

B.

FALSE

Question 14

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

Options:

A.

SAPs

B.

SDPs

C.

Services

D.

Queues

E.

Schedulers

F.

Forwarding classes

Question 15

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

Options:

A.

H2

B.

NC

C.

L2

D.

EF

E.

H1

F.

BE

Question 16

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 17

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 18

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

Options:

A.

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

B.

When an HQoS strategy using an egress port-scheduler has been deployed, Tier 1 receives its scheduling rates based on the amount of egress bandwidth available for each forwarding class.

C.

The greater the difference between PIR and CIR rates in a queue, the less likely a CIR will be provided.

D.

Packets scheduled out of high-priority queues in the default scheduler will have a lower chance of packet loss at the expense of incurring a higher probability of delay.

E.

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

Question 19

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 20

A SAP-ingress policy is configured so that ping traffic is classified as FC L1 and mapped to queue 3; however, all traffic is placed in queue 1. What is the most probable reason for this?

Options:

A.

The default forwarding class for ICMP traffic is BE and cannot be changed.

B.

The SAP has been shut down.

C.

Queue 3 has no PIR or CIR configured, and thus cannot hold any packets.

D.

The SAP-ingress policy has not been applied to the SAP.

Question 21

Which of the following QoS functions does the slope policy perform?

Options:

A.

Classification

B.

Marking

C.

Buffer admission control

D.

Scheduling

Question 22

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 23

Which of the following statements about Assured Forwarding (AF) Per Hop Behavior (PHB) groups is FALSE?

Options:

A.

It defines a premium service that effectively creates a dedicated link between peers.

B.

It defines four different AF traffic classes.

C.

Every AF class in each differentiated services node is allocated a certain amount of forwarding resources.

D.

Within each AF class, IP packets are marked with one of three possible drop precedence values.

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

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 26

Which of the following parameters is taken into account FIRST when a CFHP arbiter allocates bandwidth among its children policers?

Options:

A.

PIR

B.

CIR

C.

Level

D.

Weight

Question 27

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 28

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

Options:

A.

The IOM3 adds more memory to both forwarding complexes which increases the total number of queues available.

B.

The IOM3 only contains a single forwarding complex which reduces the number of queues used.

C.

The IOM3 allows multiple forwarding classes to be assigned to a single queue.

D.

The IOM3 allows queues to be dynamically allocated between ingress and egress.

E.

The IOM3 has a larger CPU capable of tracking active hardware queue utilization and adjusting memory allocation accordingly.

Question 29

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

Options:

A.

Ensure that traffic flows conform to their traffic profile.

B.

Log violations of metered traffic flows exceeding the CIR value set on the entity across which the traffic is moving.

C.

Provide fairness between traffic flows, so that conforming (in-profile) traffic flows are not starved of bandwidth and/or buffer space by non-conforming (out-of-profile) flows.

D.

Minimize packet loss and reduce end to end latency.

E.

Ensure that variable latencies do not cluster short bursts of originally conforming packets and render them nonconforming.

Question 30

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

Options:

A.

Each network egress port receives its own buffer pool.

B.

Each SAP-egress port receives its own buffer pool.

C.

All SAP-ingress ports on the same MDA share a buffer pool.

D.

All the network ingress ports on the same MDA share a buffer pool.

E.

Each network ingress port on the same MDA receives its own buffer pool.

Question 31

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

Options:

A.

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

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

D.

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

Question 32

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)

Options:

A.

CIR

B.

CIR level

C.

CIR weight

D.

Rate

E.

Level

F.

Weight

Question 33

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.

Options:

A.

TRUE

B.

FALSE

Question 34

Traffic corresponding to a layer-3 VPN arrives at router PE1 marked with a dot1p value of 4. The SDP carrying the traffic uses an MPLS transport tunnel. Given the policies applied on the routers in the diagram, what is the EXP value of packets arriving at router PE2?

Options:

A.

2

B.

3

C.

5

D.

6

Demo: 34 questions
Total 231 questions