Example Concept: QoS in a mixed video and VoIP network involves using techniques such as traffic classification, marking, and queuing. Traffic is classified into different categories (e.g., voice, video, data) and marked using Differentiated Services Code Point (DSCP) values. Priority queuing mechanisms, such as Low Latency Queuing (LLQ), ensure that voice packets are transmitted first, followed by video, while other data types are queued based on their priority levels. This approach minimizes jitter and latency for voice and video traffic, maintaining high-quality communication.