The answer is a self-signed certificate or one issued by an untrusted CA. When a browser encounters a TLS certificate that is not signed by a publicly trusted certificate authority, it cannot validate the certificate’s chain of trust, triggering a security warning. This is the most likely cause of the ALB TLS certificate warning from browser because ACM can import self-signed certificates, but browsers do not trust them by default. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this question tests your understanding of TLS termination and certificate trust chains—a common trap is assuming ACM certificates are always publicly trusted, but ACM can also store private or self-signed certs. Remember that for production ALBs, you must use a certificate from a public CA, either issued directly by ACM or imported from a trusted third party. Memory tip: “Self-signed = browser-frightened.”
SOA-C02 Networking and Content Delivery Practice Question
This SOA-C02 practice question tests your understanding of networking and content delivery. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 uses an Application Load Balancer (ALB) to route traffic to a web application. The security team requires that all traffic be encrypted in transit. The ALB currently uses a TLS certificate from AWS Certificate Manager (ACM). Users report that some browsers show a certificate warning. What is the MOST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The certificate is self-signed or issued by an untrusted CA.
Option A is correct because if the certificate is self-signed, browsers will show a warning. Option B is wrong because TLS 1.0 is not supported by modern browsers anyway. Option C is wrong because ALB supports TLS termination. Option D is wrong because the listener can handle multiple certificates.
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.
✗
The listener is using a different certificate for each target group.
Why it's wrong here
This is allowed and does not cause warnings.
✗
The ALB is configured to use TLS 1.0 only.
Why it's wrong here
TLS 1.0 is weak but still works; warning is more likely certificate issue.
✓
The certificate is self-signed or issued by an untrusted CA.
Why this is correct
Self-signed certificates cause browser warnings.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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: The certificate is self-signed or issued by an untrusted CA. — Option A is correct because if the certificate is self-signed, browsers will show a warning. Option B is wrong because TLS 1.0 is not supported by modern browsers anyway. Option C is wrong because ALB supports TLS termination. Option D is wrong because the listener can handle multiple certificates.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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