- A
Canary deployment.
Why wrong: Canary deployments are typically used with Lambda or CodeDeploy for Lambda, not for EC2 instances.
- B
In-place deployment.
Why wrong: In-place deployment updates existing instances, which can cause session loss for stateful applications.
- C
Blue/green deployment.
Blue/green deployment creates a new environment, allowing traffic to be switched after verification, minimizing downtime for stateful apps.
- D
Immutable deployment.
Why wrong: Immutable deployments are not supported by CodeDeploy for EC2; they are a feature of Elastic Beanstalk.
Question 1,523 of 1,616
Minimal Downtime Deployment for WebSocket Applications with CodeDeploy
This DVA-C02 practice question tests your understanding of development with aws services. 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 runs a stateful web application on EC2 instances behind an Application Load Balancer. The application uses WebSockets for real-time communication. The company wants to use AWS CodeDeploy to deploy updates with minimal downtime. Which deployment configuration should the developer use?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Blue/green deployment.
Blue/green deployment is correct because it allows the company to deploy a new version of the application on a separate set of EC2 instances (green environment) while the current version continues to serve traffic on the original set (blue environment). Once the green environment is fully tested and healthy, the Application Load Balancer can instantly switch traffic to it, minimizing downtime. This approach is ideal for stateful WebSocket applications because it avoids terminating active connections during the deployment, as the blue environment remains operational until the switch is complete.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Canary deployment.
Why it's wrong here
Canary deployments are typically used with Lambda or CodeDeploy for Lambda, not for EC2 instances.
- ✗
In-place deployment.
Why it's wrong here
In-place deployment updates existing instances, which can cause session loss for stateful applications.
- ✓
Blue/green deployment.
Why this is correct
Blue/green deployment creates a new environment, allowing traffic to be switched after verification, minimizing downtime for stateful apps.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Immutable deployment.
Why it's wrong here
Immutable deployments are not supported by CodeDeploy for EC2; they are a feature of Elastic Beanstalk.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'immutable deployment' with a valid CodeDeploy option, but AWS CodeDeploy only supports blue/green and in-place deployments, while immutable deployments are a concept from Elastic Beanstalk or EC2 Auto Scaling with launch template versioning.
Detailed technical explanation
How to think about this question
Blue/green deployments in AWS CodeDeploy work by provisioning a new Auto Scaling group (green) alongside the existing one (blue), and after validation, the Application Load Balancer's target group is updated to route traffic to the green environment. For WebSocket applications, the ALB's connection draining feature (default 300 seconds) ensures that in-flight WebSocket messages are completed before the blue instances are terminated, preserving state. This approach also leverages the ALB's support for WebSocket upgrades (RFC 6455) without requiring application-level session replication.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Development with AWS Services — This question tests Development with AWS Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Blue/green deployment. — Blue/green deployment is correct because it allows the company to deploy a new version of the application on a separate set of EC2 instances (green environment) while the current version continues to serve traffic on the original set (blue environment). Once the green environment is fully tested and healthy, the Application Load Balancer can instantly switch traffic to it, minimizing downtime. This approach is ideal for stateful WebSocket applications because it avoids terminating active connections during the deployment, as the blue environment remains operational until the switch is complete.
What should I do if I get this DVA-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This DVA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DVA-C02 exam.
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