QoS is primarily used to what in a network?

• A. Control bandwidth.
• B. Encrypt traffic end-to-end.
• C. Detect malware in data streams.
• D. Route packets to the shortest path.

Answer: (A)

Quality of Service focuses on managing network performance by allocating and controlling bandwidth for different types of traffic. By prioritizing latency-sensitive applications (like VoIP or video conferencing) and shaping or policing other traffic, QoS helps ensure predictable performance even when the network is congested. It doesn’t involve encrypting data, detecting malware, or choosing routes based on shortest paths—that falls to security measures and routing protocols. For example, in a busy office with limited bandwidth, QoS can reserve a portion of the connection for calls and video while limiting nonessential file downloads, keeping voice and video smooth.