An application requires a caching layer to improve database read performance. The cache must support complex data structures (lists, sets, sorted sets), provide sub-millisecond latency, and be highly available across multiple Availability Zones with automatic failover. Which AWS service meets these requirements?

Answer options:

Amazon ElastiCache for Redis

Amazon ElastiCache for Memcached

Amazon DynamoDB Accelerator (DAX)

Amazon CloudFront

How to approach this question

Differentiate between Redis (complex structures, HA) and Memcached (simple, multi-threaded).

Full Answer

A.Amazon ElastiCache for Redis✓ Correct

Amazon ElastiCache for Redis is an in-memory data store that provides sub-millisecond latency. Unlike Memcached, Redis supports complex data structures such as strings, hashes, lists, sets, and sorted sets. It also supports replication and Multi-AZ deployments with automatic failover, making it highly available.

Common mistakes

Choosing Memcached, which is simpler and lacks HA/complex structure support.

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