CCNP - Cisco Certified Network Professional Practice Questions: Quality of Service (QoS) Domain

Published: July 31, 2025 | 20 min read

Test your CCNP - Cisco Certified Network Professional knowledge with 10 practice questions from the Quality of Service (QoS) domain. Includes detailed explanations and answers.

CCNP - Cisco Certified Network Professional Practice Questions

Master the Quality of Service (QoS) Domain

Test your knowledge in the Quality of Service (QoS) domain with these 10 practice questions. Each question is designed to help you prepare for the CCNP - Cisco Certified Network Professional certification exam with detailed explanations to reinforce your learning.

Question 1

In a QoS configuration, which tool is used to smooth traffic flows by delaying packets to match a specified rate?

A) Traffic Policing

B) Traffic Shaping

C) Priority Queuing

D) Weighted Random Early Detection

Show Answer & Explanation

Correct Answer: B

Explanation: CORRECT: Traffic Shaping smooths traffic by delaying packets to match a rate. Traffic Policing limits rate and drops excess packets. Priority Queuing prioritizes traffic but does not smooth flows. WRED manages congestion by dropping packets, not smoothing flows.

Question 2

In a network with multiple traffic types, which QoS mechanism allows you to classify and manage traffic based on predefined classes?

A) Priority Queuing

B) Class-Based Weighted Fair Queuing (CBWFQ)

C) Traffic Policing

D) Traffic Shaping

Show Answer & Explanation

Correct Answer: B

Explanation: CORRECT: CBWFQ allows classification and management of traffic based on predefined classes, providing flexibility in QoS policies. Priority Queuing prioritizes traffic but does not use predefined classes. CBWFQ uses predefined classes for traffic management, making it correct. Traffic Policing enforces rate limits but does not classify traffic. Traffic Shaping smooths traffic flow but does not classify traffic.

Question 3

An enterprise network uses QoS to prioritize voice and video traffic. The network engineer observes that voice quality is degrading during peak usage times. Which configuration change can help improve voice quality?

A) Increase the bandwidth allocation for the voice queue.

B) Reduce the bandwidth allocation for the video queue.

C) Implement traffic shaping on the voice queue.

D) Apply a policing policy on the video queue.

Show Answer & Explanation

Correct Answer: A

Explanation: CORRECT: Increasing the bandwidth allocation for the voice queue ensures sufficient resources during peak times, improving quality. More bandwidth for voice reduces congestion and improves quality. Reducing video bandwidth might help, but does not directly improve voice. Traffic shaping delays voice traffic, potentially degrading quality. Policing video limits bandwidth but does not directly improve voice quality.

Question 4

In a QoS policy review, you identified that some traffic is not being prioritized correctly due to incorrect classification. What is the best method to rectify this issue?

A) Update the classification policy to use accurate DSCP markings.

B) Increase the overall bandwidth to avoid congestion.

C) Disable QoS and monitor traffic without constraints.

D) Deploy a load balancer to distribute traffic evenly.

Show Answer & Explanation

Correct Answer: A

Explanation: Correct DSCP markings ensure that traffic is classified properly, allowing for prioritized handling as per policy.

Question 5

Which QoS tool is best suited for managing bandwidth usage by limiting the rate of outbound traffic without buffering excess traffic?

A) Traffic Shaping

B) Traffic Policing

C) WRED (Weighted Random Early Detection)

D) DSCP Marking

Show Answer & Explanation

Correct Answer: B

Explanation: Traffic Policing is used to limit the rate of outbound traffic without buffering it, unlike Traffic Shaping which buffers excess traffic to smooth bursts. WRED is a congestion avoidance mechanism, and DSCP Marking is used for marking packets but not for managing bandwidth.

Question 6

A network administrator needs to configure QoS to ensure that data packets for a financial application receive a minimum guaranteed rate. Which mechanism should be used?

A) Class-Based Weighted Fair Queuing (CBWFQ)

B) Traffic Shaping

C) Priority Queuing

D) Traffic Policing

Show Answer & Explanation

Correct Answer: A

Explanation: CBWFQ provides guaranteed bandwidth by allocating a minimum rate for different classes of traffic.

Question 7

What is the primary function of Low Latency Queuing (LLQ) in QoS configurations?

A) To ensure that traffic exceeds the maximum bandwidth limit

B) To provide a strict priority queue for delay-sensitive traffic

C) To distribute bandwidth equally across all traffic types

D) To integrate with firewall rules for security purposes

Show Answer & Explanation

Correct Answer: B

Explanation: Low Latency Queuing (LLQ) provides a strict priority queue for delay-sensitive traffic, ensuring that this type of traffic, such as voice and video, is transmitted with minimal delay and jitter. It does not exceed bandwidth limits nor is it used for equal bandwidth distribution or security integration.

Question 8

A company’s network traffic includes mission-critical applications that cannot tolerate packet loss. Which QoS method should be used to ensure these applications maintain peak performance?

A) Traffic Shaping

B) Priority Queueing

C) Weighted Fair Queuing

D) Traffic Policing

Show Answer & Explanation

Correct Answer: A

Explanation: Traffic shaping smooths traffic flows and reduces packet loss by buffering excess traffic, making it ideal for mission-critical applications.

Question 9

Which QoS technique is used to limit the rate of traffic to a specified value and can drop packets if the rate is exceeded?

A) Traffic Shaping

B) Traffic Policing

C) Priority Queuing

D) Weighted Fair Queuing

Show Answer & Explanation

Correct Answer: B

Explanation: CORRECT: Traffic Policing limits the rate and drops packets if exceeded. Traffic Shaping delays excess packets rather than dropping them. Priority Queuing prioritizes traffic but does not limit rate. Weighted Fair Queuing does not limit rate but schedules traffic.

Question 10

Which method of classification is used in QoS to manage traffic based on the type of application?

A) Application-based Tagging

B) NBAR (Network-Based Application Recognition)

C) CBWFQ (Class-Based Weighted Fair Queuing)

D) DSCP Marking

Show Answer & Explanation

Correct Answer: B

Explanation: NBAR (Network-Based Application Recognition) is used to identify and classify applications by inspecting packets' payloads and headers, allowing QoS policies to be applied accordingly. Application-based Tagging is not a formal term, CBWFQ is used for queuing, and DSCP Marking is used for marking based on class.

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About CCNP - Cisco Certified Network Professional Certification

The CCNP - Cisco Certified Network Professional certification validates your expertise in quality of service (qos) and other critical domains. Our comprehensive practice questions are carefully crafted to mirror the actual exam experience and help you identify knowledge gaps before test day.