CCNA: Cisco Certified Network Associate — Question 1187

How does QoS optimize voice traffic?

Answer options

• A. by reducing bandwidth usage
• B. by reducing packet loss
• C. by differentiating voice and video traffic
• D. by increasing jitter

Correct answer: B

Explanation

The correct answer is B because QoS aims to minimize packet loss, which is crucial for maintaining call quality in voice communication. Options A, C, and D do not directly address the primary function of QoS in optimizing voice traffic, as reducing bandwidth usage and differentiating traffic types are not as critical as reducing packet loss, and increasing jitter would negatively impact voice quality.