What is Quality of Service (QoS) and why is it used?

• A. Techniques to secure communications with encryption
• B. Techniques to prioritize certain traffic types to guarantee performance
• C. Techniques to dynamically assign IPs to clients
• D. Techniques to monitor network temperatures

Answer: (D)

Quality of Service focuses on prioritizing certain kinds of network traffic to ensure predictable performance for critical applications. By classifying traffic and managing how much bandwidth each class gets, networks can reduce delays and jitter for time-sensitive services like voice and video, while allowing less urgent traffic to use leftover capacity. For example, a VoIP call is given higher priority than a large file download, so the call stays clear even when the network is busy. The other options describe different concepts: encryption secures data, DHCP assigns IP addresses, and monitoring temperatures relates to hardware health rather than traffic performance. Therefore, prioritizing traffic to guarantee performance is the correct idea behind QoS.