Match each AWS compute service to its typical use case.
Drag a concept onto its matching description — or click a concept then click the description.
Full control over virtual servers
Run code without provisioning servers
Run containerized applications
Run Kubernetes containers
Serverless compute for containers
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
EC2: Full control over virtual servers in the cloud
EC2 offers customizable virtual servers; Lambda is for serverless functions; ECS coordinates Docker containers. Confusion often arises between EC2 and Lambda because one is server-based and the other is serverless.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
EC2: Full control over virtual servers in the cloud
Why this is correct
EC2 provides resizable virtual machines (instances) with full administrative control over the guest OS, including custom kernels, software installations, and direct access to CPU, memory, and network. This infrastructure-as-a-service (IaaS) offering allows you to manage the entire server lifecycle, making it ideal for lifting and shifting traditional applications without code changes.
EC2: Serverless compute for event-driven applications
Why it's wrong here
EC2 relies on persistent, provisioned instances that require manual scaling, patching, and capacity planning; it is not inherently event-driven. AWS Lambda is the service that runs code in response to events like S3 uploads or API calls, automatically provisioning and managing the compute infrastructure. Attaching event-driven triggers to EC2 would still leave you operating and paying for underlying virtual servers, so the pairing is incorrect.
Lambda: Serverless compute for event-driven applications
Why this is correct
Lambda executes stateless functions in response to triggers such as S3 bucket changes, API Gateway requests, or DynamoDB stream updates, automatically provisioning and scaling compute infrastructure as needed. You pay only for the milliseconds of execution time, eliminating idle capacity and server-patching overhead. This makes Lambda a true serverless function-as-a-service (FaaS) platform optimized for building event-driven, microservice-oriented architectures.
Lambda: Full control over virtual servers in the cloud
Why it's wrong here
Lambda is a function-as-a-service (FaaS) platform where the runtime is fully managed by AWS, so you cannot access or configure the underlying operating system, install arbitrary binaries, or attach a network interface. Full control over virtual servers belongs to EC2 instances, which offer persistent, administrator-accessible virtual machines with a custom kernel and software stack. Lambda's design abstracts server management entirely, making it structurally impossible to provide the same control as EC2.
ECS: Orchestration of Docker containers at scale
Why this is correct
ECS is a managed container orchestration service that schedules and runs Docker containers across a cluster of EC2 instances or with AWS Fargate, handling task placement, service discovery, and load balancing with native IAM and VPC integration. It is the right choice for running microservices, batch jobs, or large-scale containerized workloads that require orchestration and scaling of containers, but it is neither a virtual server service like EC2 nor a function executor like Lambda.
Quick reference
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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About these practice questions
This CLF-C02 question is part of Courseiva's 988-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CLF-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 CLF-C02 exam.