The correct answer is to implement a blue/green deployment by creating a new target group and updating the ALB listener. This strategy achieves zero downtime because it provisions a completely separate environment—the green target group with new application instances—while the blue environment continues serving traffic; once the green group is verified, the ALB listener rule is atomically switched to route all traffic to the new group, eliminating any interruption. On the AWS Certified SAP on AWS Specialty PAS-C01 exam, this scenario tests your understanding of how to maintain high availability for SAP BusinessObjects during updates, specifically avoiding DNS propagation delays or in-place replacement risks. A common trap is choosing a rolling update, which can cause brief downtime as instances are replaced one by one, or a canary release, which is designed for gradual traffic shifting rather than an immediate zero-downtime cutover. Remember the memory tip: “Blue is live, green is new; switch the listener, downtime is through.”
PAS-C01 Technology Practice Question
This PAS-C01 practice question tests your understanding of technology. 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 running SAP BusinessObjects on AWS. The application servers are behind an Application Load Balancer (ALB). The ALB is configured to use a single target group. The company wants to deploy a new version of the application with zero downtime. Which deployment strategy should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement a blue/green deployment by creating a new target group and updating the ALB listener.
Option D is correct: Blue/green deployment creates a new target group with new instances, then updates the ALB listener rule to route traffic to the new group, enabling zero downtime. Option A is wrong: Rolling update with in-place replacement can cause downtime. Option B is wrong: Canary releases are for gradual rollout, not necessarily zero downtime. Option C is wrong: Creating a new ALB and updating DNS can cause DNS propagation delays.
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.
✗
Perform a rolling update by terminating one instance at a time and launching a new one.
Why it's wrong here
Rolling updates may cause temporary capacity loss.
✓
Implement a blue/green deployment by creating a new target group and updating the ALB listener.
Why this is correct
Blue/green allows instant traffic switch with no downtime.
Related concept
Static NAT maps one inside address to one outside address.
✗
Create a new ALB and update the DNS record to point to the new ALB.
Why it's wrong here
DNS changes take time to propagate, causing potential downtime.
✗
Use a canary release by routing 10% of traffic to the new version.
Why it's wrong here
Canary release is not fully zero downtime if the old version is still in use.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 PAS-C01 NAT questions on configuration and troubleshooting.
Technology — This question tests Technology — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Implement a blue/green deployment by creating a new target group and updating the ALB listener. — Option D is correct: Blue/green deployment creates a new target group with new instances, then updates the ALB listener rule to route traffic to the new group, enabling zero downtime. Option A is wrong: Rolling update with in-place replacement can cause downtime. Option B is wrong: Canary releases are for gradual rollout, not necessarily zero downtime. Option C is wrong: Creating a new ALB and updating DNS can cause DNS propagation delays.
What should I do if I get this PAS-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 PAS-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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