Quality of Service Implementation Questions

Design and implementation of quality of service policies to prioritize critical traffic and provide predictable performance under congestion. Core areas include traffic classification and marking, Differentiated Services code point usage, queuing disciplines such as priority queuing and class based weighted fair queuing, token bucket shaping and policing, ingress and egress policy placement, designing end to end quality of service across administrative domains and tunnels, interactions with encryption and overlay encapsulation, measuring effectiveness with latency jitter and packet loss metrics, and trade offs between strict priority and fair sharing. Candidates should demonstrate how to create practical, testable policies and graceful degradation plans for overloaded conditions.