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Consensus, CRDTs, sagas vs 2PC, multi-region, capacity/SLA math, failure detectors, and advanced cache/partitioning failure modes.
Sharding, hashing, consistency models, CQRS, rate limits, queues vs sync, circuit breakers, quorum, and cache coherence. Mix of single-answer and multiple-answer items.
Foundations: latency vs throughput, scaling, caching, load balancing, availability, and basic consistency. Mix of single-answer and multiple-answer items; multi-select questions ask you to select every correct statement.
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