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 production database on an Amazon RDS for PostgreSQL DB instance in a single Availability Zone. The SysOps administrator needs to improve the database's availability to meet an SLA of 99.99% and ensure automatic failover in case of a database failure. Which configuration change should be made?
Multi-AZ provides automatic failover to a standby in another AZ, offering high availability without manual intervention.
B
Create a read replica in a different AWS Region
Why wrong: A read replica is primarily for scaling read traffic and can be promoted to a standalone instance for disaster recovery, but not for automatic failover of the primary instance.
C
Configure automated backups with cross-region copy
Why wrong: Automated backups allow point-in-time recovery but do not provide automatic failover; manual recovery is needed.
D
Enable deletion protection on the DB instance
Why wrong: Deletion protection prevents accidental deletion but does not improve availability or provide failover.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable a Multi-AZ deployment
Enabling a Multi-AZ deployment for an Amazon RDS PostgreSQL DB instance automatically provisions and maintains a synchronous standby replica in a different Availability Zone. In the event of a database failure or an Availability Zone outage, Amazon RDS automatically fails over to the standby replica, typically within 60-120 seconds, meeting the 99.99% SLA requirement without manual intervention.
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 a Multi-AZ deployment
Why this is correct
Multi-AZ provides automatic failover to a standby in another AZ, offering high availability without manual intervention.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a read replica in a different AWS Region
Why it's wrong here
A read replica is primarily for scaling read traffic and can be promoted to a standalone instance for disaster recovery, but not for automatic failover of the primary instance.
✗
Configure automated backups with cross-region copy
Why it's wrong here
Automated backups allow point-in-time recovery but do not provide automatic failover; manual recovery is needed.
✗
Enable deletion protection on the DB instance
Why it's wrong here
Deletion protection prevents accidental deletion but does not improve availability or provide failover.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse read replicas (which are for read scaling and disaster recovery) with Multi-AZ deployments (which are for high availability and automatic failover), leading them to incorrectly select the cross-region read replica option.
Detailed technical explanation
How to think about this question
In a Multi-AZ deployment, Amazon RDS uses synchronous replication to the standby instance in a different Availability Zone, ensuring zero data loss (RPO of 0) during failover. The failover is triggered automatically by Amazon RDS when it detects a failure, such as a loss of network connectivity, an instance failure, or a storage failure, and it updates the DNS record to point to the standby instance. This mechanism is distinct from read replicas, which use asynchronous replication and can have replication lag.
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.
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
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
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
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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 a Multi-AZ deployment — Enabling a Multi-AZ deployment for an Amazon RDS PostgreSQL DB instance automatically provisions and maintains a synchronous standby replica in a different Availability Zone. In the event of a database failure or an Availability Zone outage, Amazon RDS automatically fails over to the standby replica, typically within 60-120 seconds, meeting the 99.99% SLA requirement without manual intervention.
What should I do if I get this SOA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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