SOA-C02 Reliability and Business Continuity Practice Question
This SOA-C02 practice question tests your understanding of reliability and business continuity. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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 company runs a critical application on a fleet of EC2 instances in an Auto Scaling group behind an Application Load Balancer. The application is deployed in us-east-1 with instances in three Availability Zones. The company's disaster recovery plan requires failover to us-west-2 within 30 minutes with a Recovery Point Objective (RPO) of 15 minutes and a Recovery Time Objective (RTO) of 30 minutes. The application uses an RDS MySQL database and stores session data in ElastiCache Redis. The SysOps administrator has configured an RDS read replica in us-west-2 with cross-Region replication and an ElastiCache cluster in us-west-2. The administrator has also created an AMI of the EC2 instances and copied it to us-west-2. During a disaster simulation, the failover took 45 minutes because the application needed to repopulate the cache. What should the administrator do to meet the RTO?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable ElastiCache Global Datastore for Redis to replicate data across regions.
Option D is correct. The issue is that the cache is cold after failover, causing delays. By pre-warming the ElastiCache cluster in us-west-2 with data from the primary region (e.g., using periodic exports/imports or replication), the cache will be ready at failover time. Option A is wrong because increasing EC2 instance size does not address the cache warm-up time. Option B is wrong because ElastiCache Global Datastore provides cross-Region replication, keeping the cache warm. However, Global Datastore may not be available for all Redis versions. Option C is wrong because storing session data in RDS would increase load on the database and may not be suitable for session data.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 ElastiCache Global Datastore for Redis to replicate data across regions.
Why this is correct
Keeps cache synchronized and warm, reducing RTO.
Related concept
Read the scenario before looking for a memorised answer.
✗
Modify the application to store session data in the RDS database instead of ElastiCache.
Why it's wrong here
Would increase database load and likely increase RTO.
✗
Increase the size of EC2 instances in us-west-2 to handle the load faster.
Why it's wrong here
Does not address cache warm-up time.
✓
Pre-warm the ElastiCache cluster in us-west-2 by periodically exporting and importing data from the primary cluster.
Why this is correct
Alternative to Global Datastore; ensures cache is warm.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which SOA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Reliability and Business Continuity — This question tests Reliability and Business Continuity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable ElastiCache Global Datastore for Redis to replicate data across regions. — Option D is correct. The issue is that the cache is cold after failover, causing delays. By pre-warming the ElastiCache cluster in us-west-2 with data from the primary region (e.g., using periodic exports/imports or replication), the cache will be ready at failover time. Option A is wrong because increasing EC2 instance size does not address the cache warm-up time. Option B is wrong because ElastiCache Global Datastore provides cross-Region replication, keeping the cache warm. However, Global Datastore may not be available for all Redis versions. Option C is wrong because storing session data in RDS would increase load on the database and may not be suitable for session data.
What should I do if I get this SOA-C02 question wrong?
Identify which SOA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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