The answer is a corrupted file system and a misconfigured firewall or iptables. An instance status check failure means the operating system or instance-level software is malfunctioning, even though the underlying physical host passes the system status check. A corrupted file system prevents the OS from booting or operating correctly, while a misconfigured firewall or iptables can block essential network traffic, making the instance unreachable. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this question tests your ability to differentiate between system-level and instance-level health checks, a common trap where candidates mistakenly blame the AWS hardware for OS or configuration issues. Remember the memory tip: "System is hardware, Instance is software"—if the system check passes but the instance check fails, the problem lies within the guest OS or its configuration, not the underlying AWS infrastructure.
SOA-C02 Monitoring, Logging, and Remediation Practice Question
This SOA-C02 practice question tests your understanding of monitoring, logging, and remediation. 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 SysOps administrator is troubleshooting an Amazon EC2 instance that is unreachable. The instance passes the system status check but fails the instance status check. Which TWO of the following are likely causes of this issue? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Misconfigured firewall or iptables
An instance status check failure indicates that the operating system or the instance itself is not functioning correctly, even though the underlying hardware (system status check) is healthy. A misconfigured firewall or iptables can block required network traffic, causing the instance to appear unreachable, while a corrupted file system can prevent the OS from booting or operating properly, both of which are detected by the instance status check.
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.
✗
Network connectivity issues
Why it's wrong here
Network issues cause system status check failure.
✗
Detached EBS root volume
Why it's wrong here
Detached root volume causes system status check failure.
✓
Misconfigured firewall or iptables
Why this is correct
A misconfigured firewall can block all traffic, making the instance unreachable.
Related concept
Read the scenario before looking for a memorised answer.
✗
Insufficient memory for applications
Why it's wrong here
Insufficient memory may cause slowdowns but not a failed instance status check.
✓
Corrupted file system
Why this is correct
Corrupted file system can cause the OS to become unresponsive.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse instance status checks with system status checks, incorrectly attributing network-level issues (like detached volumes or external connectivity) to instance status failures when they actually belong to system status failures.
Detailed technical explanation
How to think about this question
The instance status check works by sending an ARP request to the instance's network interface and expecting a response from the OS; if iptables rules drop ARP or ICMP traffic, the check fails. A corrupted file system can cause the OS to enter a read-only state or fail to mount critical partitions, which the status check detects by attempting to write a test file or verify disk consistency. In real-world scenarios, a misconfigured iptables rule that blocks all inbound traffic (e.g., `iptables -P INPUT DROP`) will cause the instance to pass system checks but fail instance checks because the hypervisor cannot reach the guest OS.
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.
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.
Monitoring, Logging, and Remediation — This question tests Monitoring, Logging, and Remediation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Misconfigured firewall or iptables — An instance status check failure indicates that the operating system or the instance itself is not functioning correctly, even though the underlying hardware (system status check) is healthy. A misconfigured firewall or iptables can block required network traffic, causing the instance to appear unreachable, while a corrupted file system can prevent the OS from booting or operating properly, both of which are detected by the instance status check.
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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This SOA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SOA-C02 exam.
Question Discussion
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