Definition
Quality of Service (QoS) refers to a set of technologies and techniques used to manage network traffic and ensure that certain types of data receive priority over others. It allows network administrators to control bandwidth, latency, jitter, and packet loss to guarantee performance for critical applications. By implementing QoS, organizations can ensure that essential services like voice calls or video conferencing are not degraded by less time sensitive data. For instance, a hospital might prioritize patient monitoring data over file downloads to maintain critical communication links. This differs from simple network congestion management as QoS actively shapes traffic flow based on predefined policies. Understanding QoS is vital for IT professionals studying for certifications like CompTIA Network+ and CCNA.