350-401 Question 61
Select 3A network engineer is implementing QoS for a critical VoIP application in the enterprise network. The goal is to prioritize VoIP traffic over less critical traffic such as web browsing and file transfers. Which QoS components must the engineer focus on when designing the solution?
- A
Classification and Marking
- B
Congestion Management
- C
Congestion Avoidance
- D
Traffic Policing
- E
Traffic Shaping
Show answer and explanation
Correct answers: A, B, C
Explanation
To ensure high-quality VoIP performance, the QoS solution must include Classification and Marking to identify VoIP traffic, Congestion Management to prioritize it during network congestion, and Congestion Avoidance to prevent packet drops. Other techniques like Traffic Policing and Traffic Shaping are less suitable for real-time voice communication, as they may introduce delays or drop packets.
- A. Correct.
Classification and Marking is essential for identifying and tagging traffic to ensure VoIP packets are recognized for prioritization across the network.
- B. Correct.
Congestion Management involves queuing mechanisms that prioritize VoIP traffic during times of congestion, ensuring low latency for voice packets.
- C. Correct.
Congestion Avoidance is used to prevent traffic drops by proactively managing traffic queues, which is critical for maintaining consistent VoIP quality.
- D. Incorrect.
Traffic Policing is not ideal for VoIP traffic as it enforces strict rate limits, potentially dropping packets that are crucial for voice quality.
- E. Incorrect.
Traffic Shaping buffers excess traffic to smooth out bursts, which is less relevant for real-time VoIP traffic that requires immediate delivery.