The answer is that the ACM certificate must be in the same AWS region as the Application Load Balancer. This requirement exists because AWS Certificate Manager is a regional service—when an ALB terminates HTTPS, it must reference a certificate stored in the exact same region where the load balancer is deployed. Cross-region certificate references are not supported for ALBs, as the service binds the certificate to the regional endpoint during provisioning. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this concept frequently appears in questions testing your understanding of regional service boundaries and HTTPS termination architecture. A common trap is assuming you can use a global certificate or import one from another region, but the ALB’s TLS handshake will fail if the region mismatch exists. Remember the memory tip: “ALB and ACM must share the same region—like a key and its lock, they must be in the same house.”
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. 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 public-facing web application on EC2 instances behind an Application Load Balancer. The ALB is configured to terminate HTTPS using a certificate from AWS Certificate Manager. What additional step is required to ensure the ALB can validate the certificate?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Ensure the certificate is in the same AWS region as the ALB.
Option B is correct because ACM certificates must be in the same region as the ALB. Option A is wrong because DNS validation is not required for ALB. Option C is wrong because private CA is not needed. Option D is wrong because CloudFront is a different service.
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.
✗
Attach the certificate to an Amazon CloudFront distribution.
Why it's wrong here
CloudFront is not involved.
✓
Ensure the certificate is in the same AWS region as the ALB.
Why this is correct
ACM certificates are region-specific.
Related concept
Static NAT maps one inside address to one outside address.
✗
Create a DNS record to validate domain ownership.
Why it's wrong here
ACM can validate via email or DNS, but ALB does not require it.
✗
Import the certificate into AWS Certificate Manager Private Certificate Authority.
Why it's wrong here
Not needed for public certificate.
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 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 ANS-C01 NAT questions on configuration and troubleshooting.
Network Implementation — This question tests Network Implementation — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Ensure the certificate is in the same AWS region as the ALB. — Option B is correct because ACM certificates must be in the same region as the ALB. Option A is wrong because DNS validation is not required for ALB. Option C is wrong because private CA is not needed. Option D is wrong because CloudFront is a different service.
What should I do if I get this ANS-C01 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 ANS-C01 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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Question Discussion
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