The correct answer is to combine an immutable update with a blue/green deployment strategy. An immutable update launches entirely new instances with the updated application version, while a blue/green deployment creates a separate, parallel environment; together, they allow traffic to be shifted to the new instances only after they pass health checks, ensuring zero downtime by never serving traffic from an instance during its update process. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this question tests your understanding of how CodeDeploy integrates with Auto Scaling groups and Application Load Balancers to avoid service disruption—a common trap is confusing in-place rolling updates (which can cause brief downtime if health checks fail) with truly zero-downtime methods. Remember the key distinction: zero downtime requires swapping the entire environment, not updating instances in place. A helpful memory tip is “Swap, don’t patch” to recall that immutable and blue/green both replace the fleet rather than modifying existing servers.
SOA-C02 Deployment, Provisioning, and Automation Practice Question
This SOA-C02 practice question tests your understanding of deployment, provisioning, and automation. 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.
A SysOps administrator is designing an automated deployment pipeline for a web application using AWS CodePipeline. The application is deployed to an Auto Scaling group behind an Application Load Balancer. The administrator wants to ensure zero downtime during deployments. Which TWO strategies should be combined? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a blue/green deployment with CodeDeploy and an Elastic Load Balancer.
Options A and D are correct because an immutable update launches new instances with the new version, then swaps them into the load balancer and terminates old ones, providing zero downtime. A blue/green deployment (option D) does the same by creating a new environment and shifting traffic. Option B is wrong because an in-place update with rolling batches may cause brief downtime if health checks fail. Option C is wrong because canary deployments are not zero downtime by default but can be used with blue/green. Option E is wrong because all-at-once causes downtime.
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.
✗
Use CodeDeploy with an all-at-once deployment.
Why it's wrong here
All-at-once replaces all instances at once, causing downtime.
✗
Use CodeDeploy with a canary deployment.
Why it's wrong here
Canary is not zero downtime; it shifts a small percentage.
✓
Use a blue/green deployment with CodeDeploy and an Elastic Load Balancer.
Why this is correct
Blue/green provides zero downtime by shifting traffic.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use CodeDeploy with an in-place update and a rolling batch configuration.
Why it's wrong here
In-place updates may cause downtime.
✓
Use CodeDeploy with an immutable update.
Why this is correct
Immutable update launches new instances and swaps them in.
Related concept
Static NAT maps one inside address to one outside address.
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 SOA-C02 NAT questions on configuration and troubleshooting.
Deployment, Provisioning, and Automation — This question tests Deployment, Provisioning, and Automation — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use a blue/green deployment with CodeDeploy and an Elastic Load Balancer. — Options A and D are correct because an immutable update launches new instances with the new version, then swaps them into the load balancer and terminates old ones, providing zero downtime. A blue/green deployment (option D) does the same by creating a new environment and shifting traffic. Option B is wrong because an in-place update with rolling batches may cause brief downtime if health checks fail. Option C is wrong because canary deployments are not zero downtime by default but can be used with blue/green. Option E is wrong because all-at-once causes downtime.
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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