QoS is used to manage what aspect of traffic?

• A. Bandwidth.
• B. User authentication.
• C. File system permissions.
• D. Printer queue management.

Answer: (A)

Quality of Service focuses on how network resources are allocated to traffic to meet performance needs, especially by controlling the amount of bandwidth available to different flows. It uses techniques like prioritizing certain traffic, shaping transmission rates, and managing queues to reduce congestion, latency, and jitter for the most important applications. This makes sure critical services such as voice and real-time video have enough bandwidth even when the network is busy. The other options deal with who can log in, what permissions a user has, or the order of print jobs—topics outside of network performance management. So QoS is about managing bandwidth for traffic.