True or false: QoS allows you to control bandwidth.

• A. It allows you to control bandwidth.
• B. It allows you to assign protocols dynamically.
• C. It encrypts payload data.
• D. It changes the MAC addresses on frames.

Answer: (A)

Quality of Service focuses on managing network performance by prioritizing traffic and regulating the bandwidth available to different streams. It can reserve bandwidth for critical applications, cap usage for less important traffic, and use queuing and shaping to ensure timely delivery, reducing latency and jitter for those high-priority flows. Because of these capabilities, the statement is true: QoS lets you control bandwidth by allocating and restricting how much is available to various data streams. It does not encrypt payload data, nor assign protocols dynamically, nor change MAC addresses; those functions serve different purposes.