nokia 4a0-107 practice test

Nokia Quality of Service

Last exam update: Nov 18 ,2025
Page 1 out of 16. Viewing questions 1-15 out of 231

Question 1

The IP ToS field consists of ________ bits, of which ________are used. The _________most
significant (first) bits define precedence.

  • A. 8, 6, 3
  • B. 8, 8, 6
  • C. 16, 8, 4
  • D. 8, 6, 4
  • E. 24, 16, 8
Mark Question:
Answer:

A

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Question 2

Which of the following are examples of metrics for QoS?

  • A. Signal degradation, attenuation, line loss
  • B. Latency, FIFO, WRED
  • C. Delay, jitter, packet loss
  • D. SNR, queue depth, latency
  • E. Attenuation, dispersion, latency
Mark Question:
Answer:

C

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Question 3

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

  • A. 010011
  • B. 100010
  • C. 010001
  • D. 001100
  • E. 010010
Mark Question:
Answer:

E

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Question 4

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.
Mark Question:
Answer:

A,B,D

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Question 5

Which of the following can be used as classifiers of customer traffic? (Choose three)

  • A. DSCP value
  • B. 802.1p value
  • C. IP DF bit
  • D. TCP/UDP port numbers
  • E. HTML version number
Mark Question:
Answer:

A,B,D

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Question 6

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

  • 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.
Mark Question:
Answer:

A,B

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Question 7

What is an SLA? (Choose two)

  • A. An SLA is used to provide automated, real-time testing and alarming for throughput, latency, and jitter across a provider's network.
  • B. An SLA is an agreement between a customer and a provider that dictates the treatment of customer traffic across the provider's network.
  • C. An SLA allows customers to control all traffic within the service provider's network by prioritizing their traffic over others as desired.
  • D. An SLA allows a customer to pre-mark traffic and ensure that traffic is treated as per the agreement within the provider's network.
  • E. An SLA is a standard set of network QoS policies that a provider shares to all its customers, allowing them to better understand the treatment of traffic within the provider's network.
Mark Question:
Answer:

B,D

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Question 8

How many bits does DSCP use to provide QoS marking options?

  • A. 8
  • B. 16
  • C. 6
  • D. 4
  • E. 3
Mark Question:
Answer:

C

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Question 9

Which of the following are major components of QoS functionality on the Nokia 7750 SR? (Choose
three)

  • A. Microflow reservations using RSVP
  • B. DSCP to EXP translation
  • C. Traffic classification
  • D. Automatic profiling and policy configuration
  • E. Buffer memory management
  • F. Traffic scheduling
Mark Question:
Answer:

C,E,F

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Question 10

Which of the following are characteristics of 802.1p? (Choose two)

  • A. 802.1p adds 16 bits to the Layer 2 header,
  • B. 802.1p adds 16 bits to the Layer 3 header.
  • C. 802.1p specifies 64 different priority levels.
  • D. 802.1p uses a field in the 802.1Q header.
  • E. 802.1p uses a field in the Layer 3 IP header
  • F. 802.1p defines a 3-bit Class of Service field.
Mark Question:
Answer:

D,F

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Question 11

Which of the following BEST describes a SAP when regarding QoS?

  • A. A point in the network where EXP bits can be mapped to one of eight predefined FCs, each one with its own queue.
  • B. A logical point in a service tunnel where all of customer traffic is aggregated.
  • C. A point at which the initial classification of customer traffic occurs.
  • D. A point in the network where QoS parameters are discarded in favor of lower-level hardware queuing functions, such as LLI (Link Layer Interleave).
  • E. A point in the network where traffic flows from multiple different services are queued together, based on forwarding class.
Mark Question:
Answer:

C

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Question 12

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

  • A. SAPs
  • B. SDPs
  • C. Services
  • D. Queues
  • E. Schedulers
  • F. Forwarding classes
Mark Question:
Answer:

F

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Question 13

What is the maximum number of SAP-ingress policies that can be applied on a SAP?

  • A. 1
  • B. 2
  • C. 3
  • D. 4
  • E. 5
  • F. 8
Mark Question:
Answer:

A

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Question 14

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

  • A. H2
  • B. NC
  • C. L2
  • D. EF
  • E. H1
  • F. BE
Mark Question:
Answer:

C

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Question 15

Which of the following are possible criteria for classifying packets at the network port ingress on the
Nokia 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.
Mark Question:
Answer:

A,C,D

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