Question 1

A solutions architect wants to propose a microservice architecture on AWS to management. Which serverless computing benefits should they include in the proposal? (Select THREE.)

Built-in high availability
Predictable performance
Lessens amount of server maintenance
Pay-for-value services
Full control over runtime environment
Continuous scaling

With serverless computing, you pay only for execution duration instead of by server unit, and there is no infrastructure to provision or manage. These lower your total cost of ownership. Serverless computing provides a good solution for microservice applications.

Question 2

A developer needs to create and deploy a simple web form to capture employee commute information for the company internal employee website. Which is a serverless solution for creating the simple web form?

Host static assets in an Amazon S3 bucket, use an Amazon RDS database, and use Amazon API Gateway and AWS Lambda functions to interact with the database.
Host static assets in an Amazon S3 bucket, use an Amazon DynamoDB table, and use Amazon API Gateway and AWS Lambda functions to interact with the database.
Host website assets in a container in an Amazon Elastic Container Service (Amazon ECS) cluster with EC2 instance nodes, use an Amazon DynamoDB table, and use server-side scripts to interact with the database.
Host website assets in a container in an Amazon Elastic Container Service (Amazon ECS) cluster with Fargate nodes, use an Amazon RDS database, and use server-side scripts to interact with the database.

All of these services are serverless. You can improve performance by using an Amazon CloudFront distribution to cache static assets for a global audience.

Question 3

Why would a solutions architect recommend to use a microservice architecture? (Select TWO.)

HTTP(S) communication
Industry-standard interfaces
Open-source code
Solves a specific business problem
Independent from other components

In a microservice architecture, business functions of a larger overall application are assigned to specific components. Components are loosely coupled and maintain independence.

Question 4

Which scaling configuration does a team lead need to apply to accomplish Lambda function scaling?

Configure the auto scaling parameter in the function configuration.
Provision enough function instances to meet the maximum predicted load.
Launch functions in Auto Scaling groups.
None because the AWS Lambda service scales functions automatically.

Question 5

A solutions architect has to use a custom library in an architecture that uses Lambda functions as the compute option. Which Lambda feature should be used for optimal function deployments?

Lambda triggers
Lambda layers
Lambda function URLs
Lambda destinations

Question 6

Which set of statements is true for software packaged as a container?

Portable application code packages that contain code and code dependencies. A container is run by a hypervisor. A container does not include a guest operating system.
Standardized, portable application code packages that contain code and code dependencies. A container is run by a container engine. A container does not include a guest operating system.
Portable application code packages that contain code and code dependencies. A container is run by a hypervisor. A container includes a guest operating system.
Standardized, portable application code packages that contain code and code dependencies. A container is run by a container engine. A container includes a guest operating system.

A container enables you to run an application and its dependencies in resource-isolated processes on top of a container engine without a guest operation system. It can be ported to different host operating systems. Virtual machines use hypervisors to host VM packages containing a guest operating system with the application and its dependencies.

Question 7

Which is the most effective container deployment using Amazon Elastic Container Service (Amazon ECS) containers when refactoring a monolithic application to use a microservice architecture?

Port the application to a new image, and run it in a container that Amazon ECS manages.
Create services that each provide a distinct function of the application, and run each service in a separate container that Amazon ECS manages.
Create services that each provide a distinct function of the application, and run multiple services in a single container that Amazon ECS manages.
Refactor the application and centralize common functions to create a smaller code footprint.

The first step in moving to a microservice architecture is to break up monolithic applications into services that each provide a more specialized function.

Question 8

An environmental science organization wants to provide HTTPS read-only access to its sensor data Amazon DynamoDB database. The user usage pattern is intermittent with 68 percent idle time per month. Which solution is the most cost efficient and secure with the least amount of operational maintenance?

Create a public interface by using Amazon API Gateway with Lambda functions accessing the DynamoDB sensor database.
Create web proxy servers on Amazon EC2 instances in an Auto Scaling group connecting to the DynamoDB sensor database, which is served by an Elastic Load Balancing load balancer.
Create user accounts in the organization’s systems to allow direct access to the DynamoDB sensor database.
Create a microservices architecture by using Amazon Elastic Container Service (Amazon ECS) connecting to the DynamoDB sensor database.

Question 9

Which workflows are suitable to implement with AWS Step Functions when the goal is to implement the solution to reduce operational overhead? (Select THREE.)

Deploy different kinds of infrastructure that are based on environment variables.
Send messages to multiple Amazon EC2 instances when a file is created or modified in an Amazon S3 bucket.
Notify a group of email addresses when the costs for an AWS account exceed a threshold.
Coordinate multi-step analytics and machine learning workflows.
Update inventory and run a shipment workflow when a customer purchases an item on an e-commerce site.
Implement manual approval in a security incident response workflow.

Incorrect - Step Functions is not needed for these workflows. Amazon Simple Notification Service (Amazon SNS) can send Amazon S3 event notifications to EC2 instances. An Amazon CloudWatch billing alert can send email when a cost threshold is exceeded. An AWS CloudFormation template can deploy infrastructure based on variables.

What is Step Functions?

Question 10

A developer wants to implement a manual approval step using an AWS Step Functions state machine. The manual approval state has to pause until a notification of approval or rejection is received from an approver email. Which should be implemented in the Step Functions state machine?

A task or activity state with an activated wait for callback parameter
A map state with automated callback parameters
A task or activity state with automated callback parameters
A map state with an activated wait for callback parameter

A wait for callback parameter is an optional feature of a task or activity. It pauses the execution at the state until the execution receives a callback from SendTaskSuccess or SendTaskFailure APIs with the task token.

CLD120 Module 14 Knowledge Check

Data Engineering Patterns

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