A company is designing a website that displays stock market prices to users. The company wants to use Amazon ElastiCache (Redis OSS) for the data caching layer. The company needs to ensure that the we

Question

Options

• AEnable read replicas in ElastiCache (Redis OSS). Promote the read replica when necessary.
• BEnable Multi-AZ in ElastiCache (Redis OSS). Fail over to a second node when necessary.
• CExport a backup of the ElastiCache (Redis OSS) cache to an Amazon S3 bucket. Restore the
• DExport a backup of the ElastiCache (Redis OSS) cache by using AWS Backup. Restore the

• A
  3% (1)
• B
  89% (31)
• C
  6% (2)
• D
  3% (1)

Explanation

For high availability, Amazon ElastiCache for Redis supports Multi-AZ with automatic failover, which provides primary and replica nodes in different Availability Zones. If the primary node fails, Redis automatically promotes a replica to primary. "When you enable Multi-AZ with automatic failover, Amazon ElastiCache automatically detects failures and promotes a read replica to primary with minimal downtime." Why B is correct: Multi-AZ provides automatic failover and data replication. Ensures continuous availability and protects against node or AZ failures. Fully managed with no manual intervention needed. Why others are incorrect: A: Manual promotion is not automatic. C & D: Restoring from backup is slow and meant for disaster recovery, not failover.

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