Which of the following is a true property of QoS?

• A. QoS can control bandwidth.
• B. QoS can assign protocols dynamically.
• C. QoS automatically fixes hardware failures.
• D. QoS changes IP addressing schemes.

Answer: (A)

Quality of Service (QoS) focuses on managing network performance by allocating resources like bandwidth to different types of traffic. A core capability is controlling bandwidth: QoS can reserve, limit, or shape how much bandwidth a class of traffic can use, ensuring that higher-priority applications (like VoIP or video conferencing) get the needed capacity even when the network is congested.

QoS doesn’t dynamically assign protocols, repair hardware, or alter IP addressing. Protocol assignment is a function of routing and software application policies, not QoS. Hardware faults are resolved by maintenance and hardware-level processes, not traffic management rules. IP addressing is determined by addressing schemes and mechanisms like DHCP or static configuration, not QoS.

So, the true property is that QoS can control bandwidth.