nokia 4A0-C02 Exam Questions
Questions for the 4A0-C02 were updated on : Nov 21 ,2025
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Question 1
Which of the following statements about the default scheduler in the Nokia 7750 SR is TRUE?
- A. A queue will be serviced as expedited if all of the forwarding classes mapped to it are expedited, regardless of its configured type.
- B. A queue will be serviced as best-effort if all of the forwarding classes mapped to it are best-effort, regardless of its configured type.
- C. A queue will be serviced as expedited if at least one of the forwarding classes mapped to it is expedited, regardless of its configured type.
- D. A queue will be serviced as expedited if its type is configured as expedited, regardless of the forwarding classes mapped to it.
Answer:
D
Question 2
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?
- 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.
Answer:
C
Question 3
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.
Answer:
B
Question 4
Which of the following about self-generated traffic QoS is TRUE?
- A. The DSCP marking stays ncl for all applications; only the internal forwarding class is manipulated across different applications.
- B. DSCP bits can be set per application, per routing instance.
- C. The internal forwarding class for self-generated traffic is set once and applied to the base router and all VPRN instances.
- D. Self-generated traffic can be marked at Layer 2 no matter what encapsulation is used on the network interfaces.
Answer:
C
Question 5
In the image shown above, the SAP-ingress policy is applied properly to a Nokia 7750 SR. A traffic
stream is received from an IP address of 192.168.1.1 with DSCP set to EF. Which forwarding class and
priority level is used for this traffic stream?
- A. FC H1, high
- B. FC EF, high
- C. FC H2, low
- D. FC EF, low
Answer:
C
Question 6
Which of the following is NOT one of the four elements in the Nokia 7750 SR QoS solution'
- A. Marking/Remarking
- B. Classification
- C. Encapsulation
- D. Scheduling
Answer:
C
Question 7
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
Answer:
D
Question 8
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
Answer:
B
Question 9
Which of the following fields in frames belonging to a Layer 3 service CANNOT be marked or
remarked on SAP-egress?
- A. Dotlp
- B. EXP
- C. DSCP
- D. PREC
Answer:
B
Question 10
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
Answer:
B
Question 11
By default, how does a hybrid port on a Nokia 7750 SR share its allocated buffer space between
access and network pools?
- 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.
Answer:
B
Question 12
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
Answer:
D
Question 13
According to the SAP-ingress QoS policy shown, what needs to be the depth of the CIR bucket of
policer 5, as a minimum, for forwarded packets to start being marked as out-of-profile?
- A. 1,000 tokens
- B. 2,000 tokens
- C. 10,000 tokens
- D. 20,000 tokens
Answer:
A
Question 14
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.
Answer:
B
Question 15
Which priority-mode queue parameter may influence both the profile marking, and scheduling
priority of a queue?
- A. PIR
- B. CIR
- C. MBS
- D. burst-limit
Answer:
C