Assess students' ability to apply and evaluate cache eviction (LRU, LFU) and expiration (TTL) strategies to optimize web application performance and scalability; tasks include selecting policies for given workload patterns and memory constraints, analyzing trade-offs (hit rate, staleness, fairness, overhead), configuring TTL and eviction thresholds, and reasoning about implementation in single-node and distributed caches (consistency, synchronization, cache warming). Include scenario-based problems requiring hit/miss calculations, cache sizing, and justification of design choices.