Assess students' ability to design a secure, scalable, and privacy-preserving federated learning architecture for heterogeneous edge devices. The quiz should test understanding and application of model aggregation strategies (e.g., FedAvg, robust and secure aggregation), communication protocols and trade-offs (latency, bandwidth, compression), differential privacy techniques and parameter tuning, and defenses against poisoning and inference attacks; require threat modeling, justification of trade-offs, and concrete deployment recommendations.