SAP-C02 Continuous Improvement for Existing Solutions Practice Question
A company is running a stateful web application on Amazon EC2 instances in an Auto Scaling group. The instances store session data in an Amazon ElastiCache for Redis cluster. The company wants to improve the application's fault tolerance and ensure that session data is not lost if an Availability Zone fails. What should the solutions architect do?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable Cluster Mode on the ElastiCache for Redis cluster and configure Multi-AZ.
Enabling Cluster Mode on the ElastiCache for Redis cluster and configuring Multi-AZ provides automatic sharding and replication across Availability Zones. This ensures that session data is not lost if an AZ fails, as replicas in other AZs can take over. Option B is incorrect because read replicas alone do not provide automatic failover or data durability across AZ failures unless Multi-AZ is enabled. Option C is incorrect because increasing instance size does not protect against AZ failure. Option D is incorrect because ElastiCache for Memcached does not support persistence or replication, so data would be lost on node failure.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable Cluster Mode on the ElastiCache for Redis cluster and configure Multi-AZ.
Why this is correct
Cluster Mode with Multi-AZ provides replication and automatic failover across AZs, protecting against AZ failure.
- ✗
Configure the ElastiCache for Redis cluster to have multiple read replicas in the same region.
Why it's wrong here
Read replicas help with read scaling but if the primary fails in an AZ outage, you still need automatic failover; Multi-AZ is required.
- ✗
Increase the instance size of the EC2 instances to handle more load.
Why it's wrong here
Instance size does not affect session data durability; it only improves compute capacity.
- ✗
Migrate from ElastiCache for Redis to ElastiCache for Memcached.
Why it's wrong here
Memcached does not support persistence or replication; data loss is more likely.
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