CLF-C02 Cloud Technology and Services Practice Test 4 — 15 Questions

Question 1

A company operates a global e-commerce website with static assets (product images, CSS, JavaScript) stored in an Amazon S3 bucket. Users in different geographic regions report slow page load times. The company wants to reduce latency without rearchitecting the application or moving the S3 bucket. Which AWS service should the company use to distribute the static assets closer to users?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Amazon CloudFront. Amazon CloudFront is a content delivery network (CDN) that caches static assets at edge locations worldwide, significantly reducing latency for users by serving content from the nearest edge location rather than from the origin S3 bucket. It integrates directly with S3 without requiring any application rearchitecture or bucket relocation, making it the ideal solution for this use case.

Answer

S3 Transfer Acceleration

Answer

Add more Amazon EC2 instances in different regions

Answer

Application Load Balancer with cross-zone load balancing

Question 2

A company runs a web application that allows users to upload images. After each upload, the application must perform several background processing tasks (e.g., resizing, generating thumbnails) that take up to 30 seconds each. Users should receive an immediate response and the processing should continue asynchronously. The company wants a solution that scales automatically with the number of uploads and requires no server management. Which AWS service should the company use to run these background processing tasks?

Accepted Answer

AWS Lambda. AWS Lambda is the correct choice because it is a serverless compute service that executes code in response to events, such as an image upload to Amazon S3. It scales automatically with the number of uploads, requires no server management, and can run background tasks like resizing and thumbnail generation within its 15-minute maximum execution time, easily accommodating the 30-second processing requirement. Users receive an immediate response because the upload triggers Lambda asynchronously, decoupling the frontend from the processing.

Answer

Amazon EC2 with Auto Scaling

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Amazon ECS with AWS Fargate

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AWS Batch

Question 3

A development team needs to deploy a web application on AWS. They want to avoid managing the underlying infrastructure, such as EC2 instances and load balancers, but still need the ability to control scaling, update the application code, and perform rollbacks. The application must scale automatically based on demand and remain highly available. Which AWS service should the team use?

Accepted Answer

AWS Elastic Beanstalk. AWS Elastic Beanstalk is the correct choice because it provides a Platform as a Service (PaaS) model that abstracts the underlying EC2 instances, load balancers, and Auto Scaling groups. It allows the team to upload their application code, and Elastic Beanstalk automatically handles capacity provisioning, load balancing, scaling, and health monitoring. The team retains control over scaling configuration, application version updates, and rollbacks through the Elastic Beanstalk console or CLI, without managing the infrastructure directly.

Answer

Amazon EC2 with Auto Scaling groups and an Application Load Balancer

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AWS Lambda

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Amazon ECS using the EC2 launch type

Question 4

A company is building a real-time chat application that relies on long-lived WebSocket connections between clients and backend servers. The application runs on Amazon EC2 instances across multiple Availability Zones. The company needs a load balancer that can distribute incoming WebSocket traffic while preserving the connection and supporting sticky sessions. Which AWS load balancing solution should the company use?

Accepted Answer

Application Load Balancer. The Application Load Balancer (ALB) supports WebSocket connections natively at the application layer (Layer 7) and can maintain persistent connections via its built-in sticky session (session affinity) feature, which uses a cookie to bind a client to a specific target for the duration of the WebSocket session. This makes ALB the correct choice for a real-time chat application requiring long-lived WebSocket connections and sticky sessions across multiple Availability Zones.

Answer

Network Load Balancer

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Classic Load Balancer

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Amazon Route 53

Question 5

A company is developing a microservices-based application using Docker containers. The development team wants to run these containers on AWS without having to provision or manage any servers. The solution must automatically scale the containers based on demand and integrate with an Application Load Balancer for traffic distribution. Which AWS service should the team use to meet these requirements?

Accepted Answer

AWS Fargate. AWS Fargate is the correct choice because it is a serverless compute engine for containers that allows you to run Docker containers without provisioning or managing servers. It automatically scales containers based on demand and integrates natively with an Application Load Balancer (ALB) for traffic distribution, meeting all the stated requirements.

Answer

AWS Lambda

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Amazon ECS on Amazon EC2

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Amazon Lightsail

Question 6

A company is deploying a multi-tier web application that includes a VPC, subnets, security groups, EC2 instances, and an Application Load Balancer. The team needs to define the entire infrastructure in a version-controlled template so that it can be consistently deployed across development, test, and production environments with minimal manual effort. Which AWS service should the team use to meet this requirement?

Accepted Answer

AWS CloudFormation. AWS CloudFormation is the correct choice because it is an Infrastructure as Code (IaC) service that allows you to define your entire multi-tier web application infrastructure—including VPC, subnets, security groups, EC2 instances, and an Application Load Balancer—in a version-controlled template (JSON or YAML). This enables consistent, repeatable deployments across development, test, and production environments with minimal manual effort, as CloudFormation handles the provisioning and updates in an orderly, predictable manner.

Answer

AWS Elastic Beanstalk

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AWS OpsWorks

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AWS Systems Manager

Question 7

A company is migrating a legacy on-premises application to AWS. The application requires a shared file system that can be mounted by multiple Amazon EC2 instances concurrently. The EC2 instances run Amazon Linux and are deployed across multiple Availability Zones for high availability. The file system must grow and shrink automatically as files are added or removed, and the company wants to avoid provisioning storage capacity in advance. Which AWS service should the company use to meet these requirements?

Accepted Answer

Amazon EFS. Amazon EFS (Elastic File System) is a fully managed NFS file system that can be mounted concurrently by multiple EC2 instances across different Availability Zones. It automatically scales storage capacity up and down as files are added or removed, eliminating the need to provision storage in advance. EFS supports the NFSv4.1 and NFSv4.0 protocols, making it ideal for shared file workloads on Amazon Linux.

Answer

Amazon S3

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Amazon EBS

Answer

Amazon FSx for Windows File Server

Question 8

A company runs a microservices application on AWS. It needs to send real-time alerts to mobile devices via push notifications and to administrators via email whenever a critical event occurs. The solution must be a fully managed service that supports both delivery channels without requiring separate infrastructure for each. Which AWS service should the company use?

Accepted Answer

Amazon Simple Notification Service (SNS). Amazon SNS is a fully managed pub/sub messaging service that supports multiple delivery protocols, including push notifications to mobile devices (via Apple Push Notification Service, Firebase Cloud Messaging, etc.) and email (via SMTP or HTTP endpoints). This allows the company to send real-time alerts through both channels from a single service without provisioning separate infrastructure for each.

Answer

Amazon Simple Queue Service (SQS)

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Amazon Simple Email Service (SES)

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Amazon Pinpoint

Question 9

A company has a web application that processes customer orders. The frontend web servers run on Amazon EC2 instances and receive order requests from users. The backend order processing system runs on a separate fleet of EC2 instances. The company wants to decouple these two tiers so that order requests are stored reliably until the backend is ready to process them. The solution must handle occasional traffic spikes without losing any messages and must allow the backend to scale independently. Which AWS service should the company use to meet these requirements?

Accepted Answer

Amazon Simple Queue Service (Amazon SQS). Amazon Simple Queue Service (SQS) is the correct choice because it provides a fully managed message queuing service that enables you to decouple and scale microservices, distributed systems, and serverless applications. SQS reliably stores messages in a queue until the backend order processing system retrieves and processes them, ensuring no messages are lost even during traffic spikes. The backend can independently scale based on the queue depth, and SQS offers at-least-once delivery and exactly-once processing with FIFO queues if needed.

Answer

Amazon Simple Notification Service (Amazon SNS)

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Amazon Kinesis Data Streams

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AWS Step Functions

Question 10

A company runs a multi-region application on AWS with separate VPCs in us-east-1 and eu-west-1. The company also has an on-premises data center connected to AWS via AWS Direct Connect. The network team wants to simplify the routing topology so that traffic between all VPCs and the on-premises network flows through a central hub. They need a service that can manage many VPC attachments and provide transitive routing across all connected networks. Which AWS service should the network team use?

Accepted Answer

AWS Transit Gateway. AWS Transit Gateway is the correct choice because it acts as a central hub that connects multiple VPCs and on-premises networks via a single gateway, enabling transitive routing between all attached networks. It supports many VPC attachments (up to thousands per gateway) and simplifies routing topology by eliminating the need for complex peering or VPN mesh configurations. This directly meets the requirement for a service that manages many VPC attachments and provides transitive routing across all connected networks.

Answer

Amazon Route 53

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AWS Direct Connect Gateway

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AWS PrivateLink

Question 11

A company is developing a web application that uses Node.js, Express, and a MySQL database. The development team wants to deploy the application to AWS without manually configuring Amazon EC2 instances, load balancers, or Auto Scaling groups. They want AWS to automatically manage the underlying infrastructure, monitor application health, and allow them to deploy new versions by simply uploading a zip file. Which AWS service should the team use to meet these requirements?

Accepted Answer

AWS Elastic Beanstalk. AWS Elastic Beanstalk is the correct choice because it provides a Platform-as-a-Service (PaaS) offering that automatically handles the provisioning of EC2 instances, load balancers, and Auto Scaling groups based on the application's environment configuration. The team can upload a zip file containing their Node.js/Express application code, and Elastic Beanstalk will deploy it, monitor health via integrated CloudWatch alarms, and manage the underlying infrastructure without manual intervention.

Answer

Amazon EC2 Auto Scaling

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AWS CloudFormation

Answer

AWS OpsWorks

Question 12

A company has a web application deployed on AWS in the us-west-2 Region. The application is accessed by users across the globe, including Europe, Asia, and South America. The company wants to improve the application's performance for international users by reducing latency and packet loss. The solution must route user traffic over the AWS global network to the closest edge location. Which AWS service should the company use?

Accepted Answer

AWS Global Accelerator. AWS Global Accelerator is the correct choice because it uses the AWS global network to route user traffic to the closest edge location via Anycast IP addresses, reducing latency and packet loss. It optimizes the path from users to the application by directing traffic to the nearest edge endpoint, then forwarding it over the AWS backbone to the application in us-west-2. This improves performance for international users without caching content, unlike a CDN.

Answer

Amazon CloudFront

Answer

Amazon Route 53 (with latency-based routing)

Answer

AWS Direct Connect

Question 13

A company runs a batch processing application in Docker containers. The application runs for several hours at a time and requires significant CPU and memory resources. The company wants to run these containers on AWS without provisioning or managing any underlying EC2 instances or cluster capacity. They need a service that automatically scales based on demand and charges only for the resources consumed by the containers. Which AWS service should the company use?

Accepted Answer

AWS Fargate. AWS Fargate is the correct choice because it is a serverless compute engine for containers that eliminates the need to provision or manage EC2 instances. It automatically scales based on demand and charges only for the CPU and memory resources consumed by the containers, which aligns perfectly with the requirement to run long-running batch processing without managing underlying infrastructure.

Answer

Amazon ECS with EC2 launch type

Answer

Amazon EKS with managed node groups

Answer

AWS Lambda

Question 14

A company has a mobile application that allows users to upload profile photos. When a new photo is uploaded to an Amazon S3 bucket, the application must automatically create a thumbnail version and store it in another S3 bucket. The company wants a solution that runs only when needed, scales automatically, and requires no management of underlying servers. Which AWS service should the company use to meet these requirements?

Accepted Answer

AWS Lambda. AWS Lambda is the correct choice because it is a serverless compute service that runs code in response to events, such as an S3 PUT object event. It automatically scales from zero to thousands of concurrent executions based on the number of incoming uploads, and requires no server management, perfectly meeting the requirement for an on-demand, auto-scaling thumbnail generation solution.

Answer

AWS Batch

Answer

Amazon EC2

Answer

Amazon ECS with EC2 launch type

Question 15

A company is building a serverless order-processing application. The workflow consists of several steps that must run in a defined order: validate the order, check inventory, process payment, and then update the database. Some steps, such as shipping notification and invoice generation, can run in parallel after payment is confirmed. The company needs a managed service to orchestrate these steps, automatically handle retries if a step fails, and provide a visual representation of the workflow's execution state. Which AWS service should the company use?

Accepted Answer

AWS Step Functions. AWS Step Functions is the correct choice because it is a fully managed serverless orchestration service that allows you to define workflows as state machines, specifying sequential steps (validate, check inventory, process payment, update database) and parallel branches (shipping notification, invoice generation). It automatically handles retries on failures with configurable backoff rates and provides a visual execution console to track the state of each workflow instance in real time, meeting all the company's requirements.

Answer

Amazon Simple Workflow Service (SWF)

Answer

Amazon MQ

Answer

AWS Glue