- A
ALB security group: inbound rule allowing HTTP from 0.0.0.0/0.
Allows HTTP traffic from internet to ALB.
- B
EC2 security group: inbound rule allowing HTTP from 0.0.0.0/0.
Why wrong: Direct internet access to EC2 bypasses ALB; should only allow from ALB.
- C
EC2 security group: inbound rule allowing HTTP from ALB security group.
Allows HTTP traffic from ALB to EC2 instances.
- D
EC2 security group: inbound rule allowing HTTPS from ALB security group.
Why wrong: ALB terminates SSL; backend uses HTTP, not HTTPS.
- E
ALB security group: inbound rule allowing HTTPS from 0.0.0.0/0.
Allows HTTPS traffic from internet to ALB.
Question 15 of 1,748
SCS-C02 Infrastructure Security Practice Question
This SCS-C02 practice question tests your understanding of infrastructure security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 web application on EC2 instances behind an Application Load Balancer (ALB). The security team wants to allow only HTTP and HTTPS traffic from the internet to the ALB, and only HTTP traffic from the ALB to the EC2 instances. Which THREE security group configurations are required? (Choose three.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
ALB security group: inbound rule allowing HTTP from 0.0.0.0/0.
Option A is correct because the ALB must accept HTTP traffic from the internet (0.0.0.0/0) to serve web requests. This inbound rule allows the ALB to listen on port 80 for unencrypted HTTP traffic, which is a standard requirement for a public-facing web application. Without this rule, HTTP requests from clients would be dropped by the ALB's security group.
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.
- ✓
ALB security group: inbound rule allowing HTTP from 0.0.0.0/0.
Why this is correct
Allows HTTP traffic from internet to ALB.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
EC2 security group: inbound rule allowing HTTP from 0.0.0.0/0.
Why it's wrong here
Direct internet access to EC2 bypasses ALB; should only allow from ALB.
- ✓
EC2 security group: inbound rule allowing HTTP from ALB security group.
Why this is correct
Allows HTTP traffic from ALB to EC2 instances.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
EC2 security group: inbound rule allowing HTTPS from ALB security group.
- ✓
ALB security group: inbound rule allowing HTTPS from 0.0.0.0/0.
Why this is correct
Allows HTTPS traffic from internet to ALB.
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 mistakenly add an HTTPS inbound rule to the EC2 security group (option D) or allow direct internet access to the instances (option B), failing to recognize that the ALB should handle HTTPS termination and only forward HTTP to the backend.
Detailed technical explanation
How to think about this question
Under the hood, the ALB's security group acts as a perimeter firewall, while the EC2 security group should reference the ALB's security group ID (not a CIDR block) to ensure traffic originates only from the ALB. This leverages AWS's security group referencing feature, which dynamically resolves to the private IPs of the ALB's nodes, providing a more secure and scalable approach than using static IP ranges. In a real-world scenario, if the ALB terminates HTTPS (port 443) and forwards HTTP (port 80) to the instances, the EC2 security group must allow only HTTP from the ALB security group, as HTTPS termination occurs at the ALB.
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.
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FAQ
Questions learners often ask
What does this SCS-C02 question test?
Infrastructure Security — This question tests Infrastructure Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: ALB security group: inbound rule allowing HTTP from 0.0.0.0/0. — Option A is correct because the ALB must accept HTTP traffic from the internet (0.0.0.0/0) to serve web requests. This inbound rule allows the ALB to listen on port 80 for unencrypted HTTP traffic, which is a standard requirement for a public-facing web application. Without this rule, HTTP requests from clients would be dropped by the ALB's security group.
What should I do if I get this SCS-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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Last reviewed: Jul 4, 2026
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