The correct answer is to configure a listener on port 443 with an SSL certificate from AWS Certificate Manager. This method secures client-ALB traffic with HTTPS by terminating SSL/TLS at the Application Load Balancer, which decrypts incoming requests before forwarding them to targets, ensuring encryption between the client and the ALB. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this concept tests your understanding of how to integrate ACM with ALB listeners for secure traffic, often appearing in scenario-based questions where you must distinguish encryption methods from network controls like security groups or NACLs. A common trap is confusing security group rules with encryption—remember that security groups filter IP traffic but do not encrypt data. For a quick memory tip: “443 with ACM” is the only way to encrypt client-to-ALB traffic, as VPNs and ACLs handle different layers entirely.
SOA-C02 Networking and Content Delivery Practice Question
This SOA-C02 practice question tests your understanding of networking and content delivery. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Which TWO are valid methods to secure traffic between a client and an Application Load Balancer?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a listener on port 443 with an SSL certificate from AWS Certificate Manager.
HTTPS listeners terminate SSL/TLS at the ALB, ensuring encryption between client and ALB. Using an SSL certificate from AWS Certificate Manager (ACM) is required for HTTPS. Option C is incorrect because security groups restrict traffic based on IP, not encryption. Option D is incorrect because network ACLs are stateless and do not encrypt. Option E is incorrect because a VPN connection is for site-to-site, not client-to-ALB.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 a listener on port 443 with an SSL certificate from AWS Certificate Manager.
Why this is correct
This enables HTTPS encryption between client and ALB.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use a security group that only allows HTTPS traffic from the client's IP.
Why it's wrong here
Security groups filter traffic but do not encrypt it.
✗
Set up an IPsec VPN connection between the client and the ALB.
Why it's wrong here
IPsecVPN is for site-to-site connections, not client-to-ALB; the ALB does not terminate VPNs.
✗
Configure a network ACL to allow only port 443.
Why it's wrong here
Network ACLs do not provide encryption.
✗
Enable the ALB's built-in SSL/TLS encryption without a certificate.
Why it's wrong here
The ALB requires a certificate for SSL/TLS; it cannot encrypt without one.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SOA-C02 NAT questions on configuration and troubleshooting.
Networking and Content Delivery — This question tests Networking and Content Delivery — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Configure a listener on port 443 with an SSL certificate from AWS Certificate Manager. — HTTPS listeners terminate SSL/TLS at the ALB, ensuring encryption between client and ALB. Using an SSL certificate from AWS Certificate Manager (ACM) is required for HTTPS. Option C is incorrect because security groups restrict traffic based on IP, not encryption. Option D is incorrect because network ACLs are stateless and do not encrypt. Option E is incorrect because a VPN connection is for site-to-site, not client-to-ALB.
What should I do if I get this SOA-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SOA-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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