Cloud · Flashcard
A three-tier web application runs in one Availability Zone. The business needs it to survive the loss of a zone, the reporting queries are saturating the database, and the budget will not stretch to a second Region. What is the smallest set of changes that meets all three?
- ASpread the web tier across zones behind an ALB, enable Multi-AZ, add a read replica
- BMove the web tier to a second Region behind Route 53, enable cross-Region replication
- CEnable Multi-AZ and point the reporting queries at the standby instance
- DAdd read replicas in three zones and let the application write to whichever responds
Why this is the answer
The three requirements map to three separate mechanisms: a load balancer across zones for the stateless tier, Multi-AZ for database failover, and a read replica to take the reporting load off the primary. A second Region is explicitly out of budget, a Multi-AZ instance deployment's standby serves no traffic so it cannot absorb reporting, and read replicas are read-only — an application cannot write to them.
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