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4A0-C02 Nokia SRA Composite Exam Free Practice Exam Questions (2025 Updated)

Prepare effectively for your Nokia 4A0-C02 Nokia SRA Composite Exam certification with our extensive collection of free, high-quality practice questions. Each question is designed to mirror the actual exam format and objectives, complete with comprehensive answers and detailed explanations. Our materials are regularly updated for 2025, ensuring you have the most current resources to build confidence and succeed on your first attempt.

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Total 639 questions

Which of the following statements BEST defines policing?

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.

Packets arrive at the VPRN SAP on PE1 with DSCP marking of all. According to the QoS policies applied at routers PE1, P, and PE2, what is the DSCP value of packets egressing router PE2? (All the SDPs are MPLS-encapsulated, and all interfaces are using their default trust states).

A.

af11

B.

af12

C.

af31

D.

af33

Which of the following statements about LAGs is TRUE?

A.

A network LAG can only connect to another network LAG.

B.

All port numbers must match between LAG endpoints.

C.

All port physical speeds must match between members of a LAG.

D.

It aggregates traffic from multiple physical ports into a single virtual port.

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

A.

DSCP

B.

PREC

C.

Dot1p

D.

ToS

E.

Q-in-Q

With hierarchical scheduling, up to ___________ tiers are supported on the Alcatel-Lucent 7750 SR.

A.

8

B.

3

C.

4

D.

5

E.

6

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 1?

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 = 5 Mbps

E.

PIR = 1.25 Mbps, CIR = 1.25 Mbps

According to the SAP-ingress QoS policy shown, which packets have a higher priority to enter queue 6?

A.

Those marked with dotlp = 5.

B.

Those marked with dscp = "ef.

C.

All packets mapped to queue 6 have the same priority to use the available buffer space.

D.

There are no packets mapped to Queue 6.

What is the purpose of the Nokia SR design that includes, for every ingress unicast queue, one hardware queue per destination forwarding complex (FFPC)?

A.

To utilize memory resources efficiently

B.

To avoid Head of Line blocking

C.

To achieve more granularity of QoS control

D.

To make hierarchical scheduling/policing possible

Based upon the exhibit, which of the following statements about LAG 1 is TRUE?

A.

PE1 is the master.

B.

The system-ID used by the CE device is 60:2c:ff:00:00:00.

C.

The Admin Key used by the CE device is 40000.

D.

There is a configuration error between the two MC peers.

Which of the following protocols are used for service label signaling?

A.

Link LDP or MP-BGP

B.

Link LDP or RSVP-TE

C.

T-LDP or MP-BGP

D.

T-LDP or RSVP-TE

Click the exhibit button below. Given that the slope-policy (below) has been enabled and applied on a network port, which of the following statements are TRUE? (Choose three)

A.

All out-of-profile traffic will be dropped before any in-profile is dropped.

B.

The time average factor of 0 will discard all packets arriving in the shared buffer pool.

C.

When the shared buffer utilization reaches 51%, in-profile packets might be dropped.

D.

The highest probability with which an out-of-profile packet can be dropped is 20%.

E.

When an in-profile packet arrives and the shared buffer utilization is at 69%, the packet will have approximately a 60% likelihood of being discarded.

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.

AF

B.

EF

C.

H2

D.

H1

E.

BE

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

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.

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

A.

SAP-ingress only

B.

SAP-egress only

C.

SAP-ingress and SAP-egress

D.

Network ingress

E.

Network egress

Which of the following statements are TRUE? (Choose two)

A.

The primary contributors to latency are distance, scheduling, and congestion.

B.

The weighted round robin scheduling algorithm will result in more delay for high priority traffic than the regular round robin algorithm.

C.

The round robin scheduling algorithm will result in less jitter for low priority traffic than a strict priority scheduler.

D.

Packet loss can be reduced by decreasing the amount of buffer space available to a queue.

E.

Latency can be reduced by increasing the amount of buffer space available to a queue.

When allocating scheduling resources, which of the following statements BEST describes how the egress port scheduler allocates bandwidth?

A.

The egress port scheduler takes the ratio of requested bandwidth to total bandwidth request from all children. It allocates bandwidth fairly, using these percentages and not exceeding the egress interface speed.

B.

The egress port scheduler allocates bandwidth based on a WRR distribution method that takes into account the CIR and PIR requested at each level and the max speed, either default or configured, on egress.

C.

The egress port scheduler allocates bandwidth on a first come, first served distribution method that takes into account the total CIR and PIR requested at each level and the max PIR requested from a single level.

D.

The egress port scheduler will limit the bandwidth offered to the egress port based on the over-subscription factor, provisioned under the router interface, while using a WRR scheduler for the remaining bandwidth.

E.

The egress port scheduler will use the Russian Dolls Method to allocate bandwidth to each level of requested bandwidth. HPO-Only is automatically set to 100%, allowing only high priority traffic to be buffered during congestion.

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.

EF

B.

H1

C.

L1

D.

H2

E.

L2

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?

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.

In the image shown above, the network QoS policy is applied properly to a Nokia 77S0 SR acting as a transit Label Switch Router (LSR) for a given MPLS tunnel. A packet is received inside the MPLS tunnel with EXP=5, dotlp=0, and DSCP=EF. Which forwarding class is assigned to this packet?

A.

BE

B.

AF

C.

EF

D.

H1

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

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.

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.

A.

TRUE

B.

FALSE

The FOB of the VPLS service shown below is empty. An Ethernet frame arrives from the customer on the SAP. Which of the following describes the action taken?

A.

The source MAC will be learned on the SAP. The frame will be replicated and flooded out of all SDPs.

B.

The source MAC will be learned on the SAP. The frame will be replicated and flooded out of all mesh SDP's.

C.

The source MAC will be learned on the SAP. The frame will be replicated and flooded out of all spoke SDPs.

D.

The frame will be discarded and no learning will take place.

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).

A.

TRUE

B.

FALSE

Which of the following entities can scheduler policies be applied to? (Choose two)

A.

Network ingress port

B.

Epipe ingress SAP

C.

ES egress SAP

D.

Ingress MDA

E.

VPRN ingress interface

F.

Shared buffer space

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

A.

64

B.

8

C.

3

D.

16

E.

1

Based on queue usage, which of the following QoS-policies when combined will allow queue rates to be dynamically allocated? (Choose two)

A.

The slope-policy

B.

The SAP-ingress policy

C.

The network-queue policy

D.

The scheduler-policy

E.

The network-policy

F.

The WRED-policy

G.

The arbitrator-policy

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

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.

Which of the following statements regarding DSCP bits are TRUE? (Choose three)

A.

The three most significant (first) bits define 8 forwarding classes.

B.

The three least significant (last) bits of the DSCP specify the drop probability.

C.

The full 8 bits of the TOS field are used for DSCP.

D.

To convert DSCP to IP precedence, the three most significant (first) bits are matched.

E.

DSCP provides for eight drop probabilities.

According to the SAP-egress policy configured and applied, which queue will EF traffic use?

A.

Queue 2 in "policer-output-queues," the default queue group used by policers on egress, because there are no queues in the "qg-10" queue-group template.

B.

The local SAP's queue 1, because there is no queue in the "qg-10" queue-group template for EF traffic.

C.

Queue 1 in the "qg-10" queue-group, because it exists by default and all traffic is mapped to it.

D.

EF traffic is dropped because there are no queues in the "qg-10" queue-group template.

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.

Profile mode queues

B.

Priority mode queues

C.

1 queue

D.

3 queues

E.

3 forwarding classes

F.

1 forwarding class, with 2 subclasses

G.

1 forwarding class, with 3 subclasses

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Total 639 questions
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