The answer is to increase the health check timeout and threshold to allow for transient high CPU usage. This is correct because the periodic spikes in ALB 5xx errors, combined with high database CPU and application timeouts, indicate that the EC2 instances are becoming temporarily overwhelmed but are not permanently failing. By adjusting the health check settings, the ALB gives the instances more time to recover from short bursts of high load before marking them unhealthy, which prevents the Auto Scaling group from prematurely replacing instances and creating a cascading failure that worsens the database strain. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of how health check tuning can mitigate transient failures without altering the application or database configuration. A common trap is to immediately blame the database or increase instance count, but the key is recognizing that normal query response times and pooled connections rule out a database bottleneck. Memory tip: "Timeout and threshold give breathing room to a stressed server."
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 responsible for a multi-tier web application running on AWS. The application consists of an Application Load Balancer (ALB), an Auto Scaling group of EC2 instances, and an Amazon RDS for MySQL database. Recently, the operations team has been receiving alerts from CloudWatch that the ALB's 'HTTPCode_Target_5XX_Count' metric is spiking periodically. The team has also noticed that the database CPU utilization is high during these spikes. The application logs show that some requests are timing out. The administrator needs to identify the root cause and implement a remediation. After reviewing the architecture, the administrator rules out the database as the bottleneck because the database connections are pooled and the query response times are normal. The administrator suspects that the issue is related to the application server's health. Which course of action should the administrator take to diagnose and resolve the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Increase the health check timeout and threshold to allow for transient high CPU usage.
Option A is correct because the periodic spikes in ALB 5xx errors, high database CPU, and application timeouts, combined with normal query response times and pooled connections, strongly suggest that the application servers are becoming overwhelmed and failing health checks. By increasing the health check timeout and threshold, the ALB will allow the EC2 instances more time to recover from transient CPU or memory pressure before being marked unhealthy and removed from service, which prevents unnecessary instance replacement and reduces the cascading load on remaining instances and the database.
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.
✓
Increase the health check timeout and threshold to allow for transient high CPU usage.
Why this is correct
This reduces false positive health check failures during short-lived CPU spikes, preventing unnecessary 5xx errors.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add an Amazon ElastiCache cluster to cache database queries.
Why it's wrong here
Database is not the bottleneck; caching does not address health check timeouts.
✗
Decrease the health check interval to detect unhealthy instances faster.
Why it's wrong here
More frequent health checks could increase load on instances and cause more 5xx errors.
✗
Increase the idle timeout on the ALB to keep connections open longer.
Why it's wrong here
Idle timeout affects persistent connections, not health check failures.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume high database CPU means the database is the bottleneck, but the question explicitly states query response times are normal and connections are pooled, so the real issue is application server health causing retries and cascading load, which is remediated by tuning health check sensitivity rather than adding caching or changing timeouts.
Detailed technical explanation
How to think about this question
The ALB health check configuration includes parameters like `HealthyThreshold`, `UnhealthyThreshold`, `Interval`, and `Timeout`. When an instance fails health checks, the ALB stops routing traffic to it, and the Auto Scaling group may terminate and replace it, causing a cascade of new instance launches that spike CPU on the database as new instances rehydrate caches or process initial requests. Increasing the `UnhealthyThreshold` (e.g., from 2 to 5) and `Timeout` (e.g., from 5 to 10 seconds) gives instances more time to recover from temporary load spikes without being prematurely removed, stabilizing the fleet.
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 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 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: Increase the health check timeout and threshold to allow for transient high CPU usage. — Option A is correct because the periodic spikes in ALB 5xx errors, high database CPU, and application timeouts, combined with normal query response times and pooled connections, strongly suggest that the application servers are becoming overwhelmed and failing health checks. By increasing the health check timeout and threshold, the ALB will allow the EC2 instances more time to recover from transient CPU or memory pressure before being marked unhealthy and removed from service, which prevents unnecessary instance replacement and reduces the cascading load on remaining instances and the database.
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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