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| Section | Weight | Objectives |
|---|---|---|
| Troubleshooting and Optimization | 18% | - Debug and resolve errors
|
| Deployment | 24% | - Implement CI/CD pipelines
|
| Security | 26% | - Apply security best practices
|
| Development with AWS Services | 32% | - Write code for applications hosted on AWS
|
>> DVA-C02 100% Correct Answers <<
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NEW QUESTION # 757
A company uses AWS CloudFormation to deploy an application that uses an Amazon API Gateway REST API with AWS Lambda function integration. The application uses Amazon DynamoDB for data persistence.
The application has three stages: development, testing, and production. Each stage uses its own DynamoDB table. The company has encountered unexpected issues when promoting changes to the production stage. A developer needs to route 20% of the traffic to the new production stage API with the next production release.
The developer needs to route the remaining 80% of the traffic to the existing production stage. The solution must minimize the number of errors that any single customer experiences. Which approach should the developer take to meet these requirements?
Answer: A
Explanation:
The correct answer is D because Amazon API Gateway REST APIs support canary deployments for stages , which allow a developer to send a controlled percentage of production traffic to a new API deployment while the rest of the traffic continues to use the current deployment. Setting the canary percentage to 20% directly satisfies the requirement to route 20% of traffic to the new release and 80% to the existing production release.
This is the best approach because API Gateway canary deployments are specifically designed to reduce the blast radius of new releases in production. AWS documentation explains that canary releases enable testing of a new deployment with a subset of client traffic before promoting it fully. Since the canary runs within the same production stage , this minimizes the number of errors experienced by any single customer compared to less controlled alternatives. It is also cleaner than routing users to the testing stage, because a testing stage often has different configuration, data, or dependencies and is not intended to serve production traffic.
Option A is incorrect because partially deploying only some planned changes is not a safe traffic-routing strategy. Option B is incorrect because weighted Route 53 routing between production and testing stages does not provide the same controlled deployment semantics and may send the same customer to inconsistent backends. Option C is incorrect because placing an ALB in front of API Gateway is unnecessary and not the intended deployment pattern for API Gateway stage traffic shifting.
Therefore, API Gateway stage canary settings are the AWS-native solution that best meets the requirement.
NEW QUESTION # 758
A developer is writing an application to analyze the traffic to a fleet of Amazon EC2 instances.
The EC2 instances run behind a public Application Load Balancer (ALB). An HTTP server runs on each of the EC2 instances, logging all requests to a log file.
The developer wants to capture the client public IP addresses. The developer analyzes the log files and notices only the IP address of the ALB.
What must the developer do to capture the client public IP addresses in the log file?
Answer: D
NEW QUESTION # 759
A company needs to develop a proof of concept for a web service application. The application will show the weather forecast for one of the company's office locations. The application will provide a REST endpoint that clients can call. Where possible, the application should use caching features provided by AWS to limit the number of requests to the backend service. The application backend will receive a small amount of traffic only during testing.
Which approach should the developer take to provide the REST endpoint MOST cost-effectively?
Answer: B
NEW QUESTION # 760
A developer is updating the production version of an AWS Lambda function to fix a defect. The developer has tested the updated code in a test environment. The developer wants to slowly roll out the updates to a small subset of production users before rolling out the changes to all users.
Only 10% of the users should be initially exposed to the new code in production.
Which solution will meet these requirements?
Answer: B
NEW QUESTION # 761
A company's application runs on a fleet of Amazon EC2 instances in a VPC within private subnets that do not have public internet access. The company uses Amazon CloudWatch to monitor the application.
A developer is troubleshooting an issue with the application. Some performance metrics are not being published to CloudWatch. The developer uses EC2 Instance Connect to access an EC2 instance. The developer verifies that a CloudWatch agent is pre-installed and running.
The developer needs to ensure that the performance metrics are published to CloudWatch.
Which solution will meet this requirement in the MOST secure way?
Answer: C
Explanation:
The EC2 instances are in private subnets with no public internet access, yet the CloudWatch agent must publish metrics to Amazon CloudWatch. To send metrics, the instances need: (1) network connectivity to CloudWatch APIs, and (2) IAM permissions that allow the agent to publish metrics and logs.
The most secure approach is to avoid opening outbound internet access via a NAT gateway (which increases the network attack surface) and instead use AWS PrivateLink through a VPC interface endpoint for CloudWatch. An interface endpoint provides private connectivity from the VPC to CloudWatch without traversing the public internet.
On the permissions side, AWS provides the managed IAM policy CloudWatchAgentServerPolicy, which is intended for the CloudWatch agent running on servers to publish metrics/logs. Attaching this policy to the EC2 instance profile role provides the needed permissions while keeping scope appropriate (unlike an admin policy).
Why the other options are not best:
A uses CloudWatchAgentAdminPolicy (broader permissions than needed) and a NAT gateway (public internet path). That is not "most secure." B is irrelevant here because the agent is already installed and running; the issue is publishing connectivity
/permissions.
D grants read-only access, which cannot publish metrics, so it cannot fix the issue.
Therefore, attach CloudWatchAgentServerPolicy to the instance role and create a VPC interface endpoint for CloudWatch.
NEW QUESTION # 762
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