Nokia Quality of Service - 4A0-107 Exam Questions [2026]

QUESTION NO: 1
A packet is to be encapsulated inside an MPLS tunnel which consists of two MPLS headers at the first network egress. Which of the MPLS EXP fields will be marked?

A. The EXP field in the bottom MPLS header will be marked. B. The EXP field in both the top and bottom MPLS headers will be marked. C. The EXP field in the top MPLS header will be marked. D. Neither the top nor the bottom EXP field will be marked since EXP remarking can only be done on the network ingress. E. For Layer 2 services, the top MPLS header will be marked; for Layer 3 services, the bottom MPLS header will be marked.

Correct Answer: B

QUESTION NO: 2
Which of the following statements about the default scheduler in the Nokia 7750 SR is FALSE?

A. A queue configured as auto-expedited will be an expedited queue as long as no Best Effort FC is mapped to it. B. A queue will be serviced as expedited if its type is configured as expedited, regardless of the forwarding classes mapped to it. C. The default scheduler spends an equal amount of time servicing each queue that has traffic to be sent out. D. Queue-type can be configured as best-effort, expedite, or auto-expedite.

Correct Answer: C

QUESTION NO: 3
Which of the following statements are TRUE regarding the building of a QoS-enabled network? (Choose two)

A. It is important that all packets are classified in the same way at all SAP-ingress points. B. Native IP packets entering a network port will be marked at the first network egress by default C. Once a packet is classified to a forwarding class, it cannot change across the network. D. Native IP packets entering a network port will not be marked at the first network egress by default. E. Packet enters a node will be treated as per the local hop's configured policy. F. Native IP packets entering a network port will be marked at the first network egress, regardless of the re-marking configuration.

Correct Answer: D,E

QUESTION NO: 4

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

A. Assured B. Best-effort C. Self-generated D. Real-time

Correct Answer: B

QUESTION NO: 5
Which of the following statements are TRUE? (Choose two)

A. The primary contributors to latency are distance, scheduling, and congestion. B. Packet loss can be reduced by decreasing the amount of buffer space available to a queue. C. The round robin scheduling algorithm will result in less jitter for low priority traffic than a strict priority scheduler. D. Latency can be reduced by increasing the amount of buffer space available to a queue. E. The weighted round robin scheduling algorithm will result in more delay for high priority traffic than the regular round robin algorithm.

Correct Answer: A,C

QUESTION NO: 6
Without_______, a customer's high priority traffic can be dropped before its low priority traffic.

A. OAM functionality B. packet filtering C. prioritization of traffic flows D. separation between the data plane and the control plane E. least cost routing

Correct Answer: C

QUESTION NO: 7
To manage the shared buffer space at network ports, slope policies are applied on _________ for the ingress direction, and on ________ or _________ for the egress direction.

A. MDAs, ports, interfaces B. MDAs, MDAs, ports C. Interfaces, ports, SAPs D. Interfaces, interfaces. MDAs E. Ports, ports, MDAs

Correct Answer: B

QUESTION NO: 8
Which of the following is NOT an advantage of deploying queue-groups on a network port?

A. It enables fine-tuned SLA control that is not possible when using a common set of queues for all L2/L3 services. B. It improves scalability by allowing the use of queues instead of the default set of policers used on network egress. C. It enables CFHP and hierarchy scheduling (egress) for each network interface. D. It allows for enforcing bandwidth reservations of the LSPs that are used by the SDPs configured on the network interfaces.

Correct Answer: C

QUESTION NO: 9

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?

A. 10 kilobytes B. 2 kilobytes C. 1 kilobyte D. 20 kilobytes

Correct Answer: D

QUESTION NO: 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)

A. Using DSCP bits within the ToS field of the IP packet header. B. Using the CLP bit of the ATM cell header. C. Using the EXP bits of the MPLS transport label header. D. Using dot1p bits of the 802.1q Ethernet frame header E. Using the IP precedence bits within the ToS field of the IP packet header.

Correct Answer: A,D

QUESTION NO: 11
Which of the following statements regarding buffer pool allocation are FALSE? (Choose two)

A. Each SAP-egress port receives its own buffer pool. B. Each network ingress port on the same MDA receives its own buffer pool. C. Each network egress port receives its own buffer pool. D. All the network ingress ports on the same MDA share a buffer pool. E. All SAP-ingress ports on the same MDA share a buffer pool.

Correct Answer: B,E

QUESTION NO: 12
When using an egress port scheduler, on which scheduling loop are orphaned queues serviced?

A. Level 1 between CIR and PIR. B. Level 8 within CIR. C. Level 1, once all PIR is serviced. D. Level 1 within CIR. E. Level 8, once all PIR is serviced. F. Level 8 between CIR and PIR.

Correct Answer: E

QUESTION NO: 13
The network QoS policy shown below is applied properly to a Nokia 7750 SR acting as a transit Label Switch Router (LSR) for a given MPLS tunnel. A packet is received inside the MPLS tunnel with EXP=4, dot1p=4, and DSCP=AF. Which forwarding class is assigned to this packet?

A. L2 B. H1 C. BE D. AF

Correct Answer: B