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.
Network Topology
A SysOps administrator runs the above command for an EC2 instance. The instance is running but the system status check is impaired. What does this indicate?
Network Topology
A
The instance is still running but the application is not responding.
Why wrong: Application unresponsiveness is not directly indicated by EC2 status checks.
B
The instance is unreachable due to a misconfigured security group.
Why wrong: Security group issues would cause instance status check failure, not system status.
C
There is a problem with the underlying physical host that requires stopping and starting the instance.
System status checks detect problems like loss of network connectivity, power loss, or hardware failure on the host.
D
The operating system on the instance has crashed.
Why wrong: OS issues are detected by instance status checks, not system status checks.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
There is a problem with the underlying physical host that requires stopping and starting the instance.
The system status check in AWS EC2 monitors the underlying physical host for issues such as loss of network connectivity, power loss, or hardware failure. When this check is impaired, it indicates a problem with the host that requires stopping and starting the instance to migrate it to a new healthy host. Option C is correct because stopping and starting the instance forces a migration to a different physical host, resolving the underlying hardware issue.
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.
✗
The instance is still running but the application is not responding.
Why it's wrong here
Application unresponsiveness is not directly indicated by EC2 status checks.
✗
The instance is unreachable due to a misconfigured security group.
Why it's wrong here
Security group issues would cause instance status check failure, not system status.
✓
There is a problem with the underlying physical host that requires stopping and starting the instance.
Why this is correct
System status checks detect problems like loss of network connectivity, power loss, or hardware failure on the host.
Related concept
Read the scenario before looking for a memorised answer.
✗
The operating system on the instance has crashed.
Why it's wrong here
OS issues are detected by instance status checks, not system status checks.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse system status checks (host-level) with instance status checks (guest-level), leading them to incorrectly attribute the failure to OS or application issues rather than the underlying physical host.
Detailed technical explanation
How to think about this question
The system status check uses a combination of network reachability tests (ICMP echo requests) and physical host health signals (e.g., power, storage, and network hardware status) to determine if the host is operational. If the host experiences a hardware failure, the instance remains running but may become unreachable or suffer performance degradation; stopping and starting the instance triggers a migration to a new host, which is the only recovery action for such issues. In real-world scenarios, this is critical for instances in a placement group where host failure can affect multiple instances simultaneously.
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
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Visual reference
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: There is a problem with the underlying physical host that requires stopping and starting the instance. — The system status check in AWS EC2 monitors the underlying physical host for issues such as loss of network connectivity, power loss, or hardware failure. When this check is impaired, it indicates a problem with the host that requires stopping and starting the instance to migrate it to a new healthy host. Option C is correct because stopping and starting the instance forces a migration to a different physical host, resolving the underlying hardware issue.
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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