The correct answer is to configure the ALB listener for HTTPS on port 443 and to restrict the ALB security group to only allow inbound HTTPS traffic. This ensures that the Application Load Balancer terminates SSL using the ACM certificate and never accepts unencrypted HTTP connections at the listener level, while the security group acts as a network firewall to drop any non-HTTPS packets before they reach the load balancer. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of defense in depth: the listener controls protocol termination, and the security group enforces the boundary. A common trap is assuming an HTTP-to-HTTPS redirect is sufficient—this still leaves port 80 open, which violates a strict HTTPS-only policy. Remember the memory tip: "Listener locks the protocol, security group locks the port."
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 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.
Options A and D are correct. The ALB listener must be configured for HTTPS on port 443, and the security group for the ALB should only allow inbound HTTPS traffic. Option B is wrong because HTTP listener is not needed. Option C is wrong because the security group for instances should allow traffic from the ALB, not from the internet. Option E is wrong because redirecting HTTP to HTTPS is not sufficient if the listener accepts HTTP; the listener should not accept HTTP at all.
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.
✗
Configure the security group for the ALB to allow inbound traffic on port 80 from 0.0.0.0/0.
Read the scenario before looking for a memorised answer.
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 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.
Identify which ANS-C01 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.
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Read the scenario before looking for a memorised answer..
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. — Options A and D are correct. The ALB listener must be configured for HTTPS on port 443, and the security group for the ALB should only allow inbound HTTPS traffic. Option B is wrong because HTTP listener is not needed. Option C is wrong because the security group for instances should allow traffic from the ALB, not from the internet. Option E is wrong because redirecting HTTP to HTTPS is not sufficient if the listener accepts HTTP; the listener should not accept HTTP at all.
What should I do if I get this ANS-C01 question wrong?
Identify which ANS-C01 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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