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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Troubleshooting and Optimization | 18% | - Performance optimization
|
| Topic 2: Security | 26% | - Application authentication and authorization
|
| Topic 3: Development with AWS Services | 32% | - AWS core services development
|
| Topic 4: Deployment | 24% | - CI/CD and deployment strategies
|
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NEW QUESTION # 875
A developer is creating an application that must be able to generate API responses without backend integrations. Multiple internal teams need to work with the API while the application is still in development.
Which solution will meet these requirements with the LEAST operational overhead?
Answer: C
Explanation:
Comprehensive Detailed and Lengthy Step-by-Step Explanation with All AWS Developer References:
1. Understanding the Use Case:
The API needs to:
* Generate responses without backend integrations: This indicates the use of mock responses for testing.
* Be used by multiple internal teams during development.
* Minimize operational overhead.
2. Key Features of Amazon API Gateway:
* REST APIs: Fully managed API Gateway option that supports advanced capabilities like mock integrations, request/response transformation, and more.
* HTTP APIs: Lightweight option for building APIs quickly. It supports fewer features but has lower operational complexity and cost.
* Mock Integration: Allows API Gateway to return pre-defined responses without requiring backend integration.
3. Explanation of the Options:
* Option A:"Create an Amazon API Gateway REST API. Set up a proxy resource that has the HTTP proxy integration type."A proxy integration requires a backend service for handling requests. This does not meet the requirement of "no backend integrations."
* Option B:"Create an Amazon API Gateway HTTP API. Provision a VPC link, and set up a private integration on the API to connect to a VPC."This requires setting up a VPC and provisioning resources, which increases operational overhead and is unnecessary for this use case.
* Option C:"Create an Amazon API Gateway HTTP API. Enable mock integration on the method of the API resource."While HTTP APIs can enable mock integrations, they have limited support for advanced features compared to REST APIs, such as detailed request/response customization. REST APIs are better suited for development environments requiring mock responses.
* Option D:"Create an Amazon API Gateway REST API. Enable mock integration on the method of the API resource."This is the correct answer. REST APIs with mock integration allow defining pre- configured responses directly within API Gateway, making them ideal for scenarios where backend services are unavailable. It provides flexibility for testing while minimizing operational overhead.
4. Implementation Steps:
To enable mock integration with REST API:
* Create a REST API in API Gateway:
* Open the API Gateway Console.
* Choose Create API > REST API.
* Define the API Resource and Methods:
* Add a resource and method (e.g., GET or POST).
* Set Up Mock Integration:
* Select the method, and in the Integration Type, choose Mock Integration.
* Configure the Mock Response:
* Define a 200 OK response with the desired response body and headers.
* Deploy the API:
* Deploy the API to a stage (e.g., dev) to make it accessible.
5. Why REST API Over HTTP API?
* REST APIs support detailed request/response transformations and robust mock integration features, which are ideal for development and testing scenarios.
* While HTTP APIs offer lower cost and simplicity, they lack some advanced features required for fine- tuned mock integrations.
References:
* Amazon API Gateway REST API Features
* Mock Integration in API Gateway
* Comparison of REST and HTTP APIs in API Gateway
* AWS API Gateway Pricing
NEW QUESTION # 876
A developer is trying to get data from an Amazon DynamoDB table called demoman-table. The developer configured the AWS CLI to use a specific IAM user's credentials and ran the following command:
aws dynamodb get-item --table-name demoman-table --key '{"id": {"N":"1993"}}' The command returned errors and no rows were returned.
What is the MOST likely cause of these issues?
Answer: C
Explanation:
The command is correct and the demoman table exists. The most likely issue is that the IAM user does not have a policy associated with read access to the demoman table.
To resolve the issue, the developer must add a policy to the IAM user that grants read access to the demoman table.
NEW QUESTION # 877
A developer is building an ecommerce application that uses multiple AWS Lambda functions. Each function performs a specific step in a customer order workflow, such as order processing and inventory management.
The developer must ensure that the Lambda functions run in a specific order.
Which solution will meet this requirement with the LEAST operational overhead?
Answer: D
Explanation:
The requirement here is to ensure that Lambda functions are executed in a specific order. AWS Step Functions is a low-code workflow orchestration service that enables you to sequence AWS services, such as AWS Lambda, into workflows. It is purpose-built for situations like this, where different steps need to be executed in a strict sequence.
AWS Step Functions: Step Functions allows developers to design workflows as state machines, where each state corresponds to a particular function. In this case, the developer can create a Step Functions state machine where each step (order processing, inventory management, etc.) is represented by a Lambda function.
Operational Overhead: Step Functions have very low operational overhead because it natively handles retries, error handling, and function sequencing.
Alternatives:
Amazon SQS (Option A): While SQS can manage message ordering, it requires more manual handling of each step and the logic to sequentially invoke the Lambda functions.
Amazon SNS (Option B): SNS is a pub/sub service and is not designed to handle sequences of Lambda executions.
EventBridge (Option D): EventBridge Scheduler allows you to invoke Lambda functions based on scheduled times, but it doesn't directly support sequencing based on workflow logic.Therefore, AWS Step Functions is the most appropriate solution due to its native orchestration capabilities and minimal operational complexity.
AWS Step Functions documentation
NEW QUESTION # 878
A company uses a pipeline in AWS CodePipeline that include AWS CodeBuild projects. The company encrypts the pipeline and build artifacts with AWS managed AWS KMS keys.
The company needs to update the pipeline to encrypt artifacts by using an existing customer managed KMS key.
Which combination of steps will meet these requirements in the MOST cost-effective way?
(Choose two.)
Answer: A,B
Explanation:
Updating the pipeline's artifact settings to specify the customer managed KMS key ensures pipeline-level artifact encryption with the desired key.
Updating the CodeBuild project's artifact settings to reference the customer managed KMS key ensures build artifacts are encrypted with that key.
NEW QUESTION # 879
A developer created several AWS Lambda functions that write data to a single Amazon S3 bucket. The developer configured all the Lambda functions to send logs and metrics to Amazon CloudWatch.
The developer receives reports that one of the Lambda functions writes data to the bucket very slowly. The developer needs to measure the latency between the problematic Lambda function and the S3 bucket.
Which solution will meet this requirement?
Answer: B
NEW QUESTION # 880
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