SOA-C02 Networking and Content Delivery Practice Question
This SOA-C02 practice question tests your understanding of networking and content delivery. 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 notices that traffic to an Application Load Balancer (ALB) is being rejected. The ALB has a security group that allows inbound HTTP (80) and HTTPS (443) from 0.0.0.0/0. The target group health checks are failing. What could be the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The target instances' security group does not allow inbound traffic from the ALB security group.
Option C is correct because the ALB security group must allow inbound traffic from clients, but the target instances' security group must allow inbound traffic from the ALB security group. If the target security group does not allow traffic from the ALB, health checks fail. Option A is wrong because health checks come from the ALB, not the internet. Option B is wrong because the ALB does not have a security group on the target side. Option D is wrong because the ALB's security group already allows HTTP/S.
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 target instances' security group does not allow inbound traffic from the ALB security group.
Why this is correct
The target security group must allow inbound from the ALB for health checks to succeed.
Related concept
Read the scenario before looking for a memorised answer.
✗
The ALB security group does not allow outbound traffic to the targets.
Why it's wrong here
Security groups are stateful; outbound is automatically allowed for established connections.
✗
The ALB’s security group is blocking health check traffic from the targets.
Why it's wrong here
Health check traffic is from ALB to targets, not the other way.
✗
The target instances' security group does not allow inbound HTTP/HTTPS from the internet.
Why it's wrong here
Health checks come from the ALB, not the internet.
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 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 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.
Networking and Content Delivery — This question tests Networking and Content Delivery — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The target instances' security group does not allow inbound traffic from the ALB security group. — Option C is correct because the ALB security group must allow inbound traffic from clients, but the target instances' security group must allow inbound traffic from the ALB security group. If the target security group does not allow traffic from the ALB, health checks fail. Option A is wrong because health checks come from the ALB, not the internet. Option B is wrong because the ALB does not have a security group on the target side. Option D is wrong because the ALB's security group already allows HTTP/S.
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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