- A
Configure the security group for the ALB to allow inbound traffic on port 80 from 0.0.0.0/0.
Why wrong: Allowing HTTP inbound is not allowed.
- B
Configure the ALB listener to accept traffic on port 80.
Why wrong: Accepting HTTP traffic violates the requirement.
- C
Configure the security group for the ALB to allow inbound traffic on port 443 from 0.0.0.0/0.
This allows HTTPS traffic from the internet.
- D
Configure the ALB to redirect HTTP traffic to HTTPS.
Why wrong: This still accepts HTTP traffic initially, which may not be acceptable.
- E
Configure the ALB listener to accept traffic on port 443 using the SSL certificate.
This enables HTTPS termination.
Question 1,371 of 1,705
ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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 is deploying a web application that must be accessible over HTTPS only. They are using an Application Load Balancer (ALB) with an SSL certificate from AWS Certificate Manager (ACM). Which TWO configurations are necessary to ensure that only HTTPS traffic reaches the application?
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
✓
Configure the security group for the ALB to allow inbound traffic on port 443 from 0.0.0.0/0.
To ensure only HTTPS traffic reaches the application, the security group for the ALB should allow inbound traffic on port 443 from anywhere (option C), and the ALB listener must be configured to accept traffic on port 443 using the SSL certificate from ACM (option E). Option A is incorrect because allowing port 80 would permit HTTP traffic. Option B is incorrect because an HTTP listener would accept unencrypted traffic. Option D is incorrect because redirecting HTTP to HTTPS still allows HTTP traffic to reach the ALB initially; the proper approach is to not accept HTTP at all.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure the security group for the ALB to allow inbound traffic on port 80 from 0.0.0.0/0.
Why it's wrong here
Allowing HTTP inbound is not allowed.
- ✗
Configure the ALB listener to accept traffic on port 80.
Why it's wrong here
Accepting HTTP traffic violates the requirement.
- ✓
Configure the security group for the ALB to allow inbound traffic on port 443 from 0.0.0.0/0.
Why this is correct
This allows HTTPS traffic from the internet.
Related concept
Standard ACLs match source addresses.
- ✗
Configure the ALB to redirect HTTP traffic to HTTPS.
Why it's wrong here
This still accepts HTTP traffic initially, which may not be acceptable.
- ✓
Configure the ALB listener to accept traffic on port 443 using the SSL certificate.
Why this is correct
This enables HTTPS termination.
Related concept
Standard ACLs match source addresses.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related ANS-C01 ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Configure the security group for the ALB to allow inbound traffic on port 443 from 0.0.0.0/0. — To ensure only HTTPS traffic reaches the application, the security group for the ALB should allow inbound traffic on port 443 from anywhere (option C), and the ALB listener must be configured to accept traffic on port 443 using the SSL certificate from ACM (option E). Option A is incorrect because allowing port 80 would permit HTTP traffic. Option B is incorrect because an HTTP listener would accept unencrypted traffic. Option D is incorrect because redirecting HTTP to HTTPS still allows HTTP traffic to reach the ALB initially; the proper approach is to not accept HTTP at all.
What should I do if I get this ANS-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related ANS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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