- A
Deploy a single-node Redis cluster and rely on application-level retries when cache misses occur.
Why wrong: A single-node setup has no automatic failover, so AZ impairment can fully break cache availability.
- B
Configure an ElastiCache Redis replication group with automatic failover across multiple Availability Zones.
Multi-AZ replication groups provide redundant nodes and automatic failover, improving cache resilience during AZ events.
- C
Move the cache into the VPC but keep it in one Availability Zone to reduce network latency.
Why wrong: Network placement does not address AZ-level redundancy; keeping one AZ still creates a single point of failure.
- D
Use a Memcached cluster and configure only client-side connection pooling without failover support.
Why wrong: Memcached differs operationally and connection pooling does not implement node-level failover in another AZ.
SAA-C03 Design Resilient Architectures Practice Question
This SAA-C03 practice question tests your understanding of design resilient architectures. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: redis replication groups provide high availability and data redundancy.. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A caching layer uses Amazon ElastiCache for Redis in front of a stateless web service. The service must continue to read cached responses during maintenance events and should automatically fail over to another node if one AZ becomes impaired. Which design change best satisfies this requirement?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Configure an ElastiCache Redis replication group with automatic failover across multiple Availability Zones.
Option B is correct because an ElastiCache Redis replication group with automatic failover across multiple Availability Zones ensures that if the primary node or its AZ becomes impaired, a read-replica in another AZ is automatically promoted to primary. This allows the stateless web service to continue reading cached responses during maintenance events without interruption, as the failover is transparent to the application.
Key principle: Redis replication groups provide high availability and data redundancy.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Deploy a single-node Redis cluster and rely on application-level retries when cache misses occur.
Why it's wrong here
A single-node setup has no automatic failover, so AZ impairment can fully break cache availability.
- ✓
Configure an ElastiCache Redis replication group with automatic failover across multiple Availability Zones.
Why this is correct
Multi-AZ replication groups provide redundant nodes and automatic failover, improving cache resilience during AZ events.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Redis replication groups provide high availability and data redundancy.
- ✗
Move the cache into the VPC but keep it in one Availability Zone to reduce network latency.
Why it's wrong here
Network placement does not address AZ-level redundancy; keeping one AZ still creates a single point of failure.
- ✗
Use a Memcached cluster and configure only client-side connection pooling without failover support.
Why it's wrong here
Memcached differs operationally and connection pooling does not implement node-level failover in another AZ.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Memcached with Redis, assuming that Memcached also supports replication and automatic failover, or they mistakenly think a single-node Redis cluster with retries is sufficient for high availability during AZ impairments.
Detailed technical explanation
How to think about this question
ElastiCache Redis replication groups use a primary node for writes and up to five read replicas; automatic failover leverages the Redis Sentinel protocol to detect primary failure and promote a replica. During failover, the DNS endpoint for the primary is updated to point to the new primary, so applications using the primary endpoint experience minimal disruption. In a multi-AZ deployment, replicas are placed in different AZs, ensuring that even if an entire AZ becomes impaired, the cache remains available.
KKey Concepts to Remember
- Redis replication groups provide high availability and data redundancy.
- Multi-AZ deployment distributes nodes across Availability Zones.
- Automatic failover promotes a replica to primary upon failure.
- Read replicas can serve read traffic and improve resilience.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Redis replication groups provide high availability and data redundancy.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Resilient Architectures — This question tests Design Resilient Architectures — Redis replication groups provide high availability and data redundancy..
What is the correct answer to this question?
The correct answer is: Configure an ElastiCache Redis replication group with automatic failover across multiple Availability Zones. — Option B is correct because an ElastiCache Redis replication group with automatic failover across multiple Availability Zones ensures that if the primary node or its AZ becomes impaired, a read-replica in another AZ is automatically promoted to primary. This allows the stateless web service to continue reading cached responses during maintenance events without interruption, as the failover is transparent to the application.
What should I do if I get this SAA-C03 question wrong?
Review redis replication groups provide high availability and data redundancy., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Redis replication groups provide high availability and data redundancy.
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Last reviewed: Jun 11, 2026
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