CLF-C02 Cloud Concepts Practice Test 9 — 15 Questions

Question 1

A development team is building a web application and wants to minimize operational overhead. The team wants to focus solely on writing and deploying code without managing the underlying operating system, runtime, or middleware. The team needs the ability to simply upload their application code and have it run, with the cloud provider automatically handling capacity provisioning, load balancing, and patching of the platform. Which cloud computing service model best describes this approach?

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

Accepted Answer

Platform as a Service (PaaS). Platform as a Service (PaaS) is the correct model because it abstracts the underlying infrastructure, runtime, and middleware, allowing the team to simply upload code and have it executed. The cloud provider automatically handles capacity provisioning, load balancing, and patching, which directly matches the requirement to minimize operational overhead by focusing solely on code.

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Infrastructure as a Service (IaaS)

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Software as a Service (SaaS)

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Function as a Service (FaaS)

Question 2

A company uses AWS to host its web application. The company's IT manager learns that multiple AWS customers may have virtual machines running on the same physical server within an AWS data center. However, the manager is confident that each customer's data is securely isolated from others and that customers have no visibility into or control over the underlying physical infrastructure. Which essential characteristic of cloud computing does this scenario best demonstrate?

Accepted Answer

Resource pooling. Resource pooling is the correct answer because it describes the cloud characteristic where the provider's computing resources (such as physical servers) are pooled to serve multiple customers using a multi-tenant model. AWS uses hypervisor-based isolation (e.g., Xen or Nitro) to ensure that each customer's virtual machine has no visibility into or control over the underlying physical hardware or other tenants' workloads, while still sharing the same physical server. This directly matches the scenario's description of multiple customers running VMs on the same physical host with secure isolation.

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Rapid elasticity

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On-demand self-service

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Measured service

Question 3

A company has migrated its IT infrastructure to AWS. The company's finance team receives a monthly bill that itemizes charges based on the number of Amazon EC2 instance hours consumed, the amount of Amazon S3 storage used in gigabyte-months, and the total data transferred out to the internet. The cloud provider automatically tracks and reports this usage data for billing purposes. This scenario best demonstrates which essential characteristic of cloud computing?

Accepted Answer

Measured service. The scenario describes a cloud provider automatically tracking and reporting usage data (EC2 instance hours, S3 storage in gigabyte-months, and data transfer) for billing purposes. This is the essence of measured service, where cloud resources are metered and usage is monitored, controlled, and reported transparently. The pay-per-use billing model relies on this characteristic to provide cost visibility and optimization.

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On-demand self-service

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Broad network access

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Resource pooling

Question 4

A developer at a company is working on a new feature. The developer needs a test server running a specific version of Linux with certain software pre-installed. Without waiting for approval from the IT team or filling out a request form, the developer logs into the AWS Management Console, chooses an Amazon EC2 instance type, configures the security group, and launches the instance. The instance is fully operational within minutes. Which essential characteristic of cloud computing does this scenario best illustrate?

Accepted Answer

On-demand self-service. The scenario describes a developer provisioning an EC2 instance directly through the AWS Management Console without any human interaction with the IT team. This is the defining characteristic of on-demand self-service, where a customer can provision computing resources as needed automatically without requiring human interaction with each service provider. The ability to configure the instance type, security group, and launch it in minutes without a request form or approval chain directly maps to this essential cloud characteristic.

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Rapid elasticity

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Resource pooling

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Measured service

Question 5

A company has a strict data residency policy that requires all customer data to remain stored on-premises at all times. However, the company experiences unpredictable spikes in compute demand and wants to use an AWS cloud environment to handle this additional workload during peak periods. The company needs a solution that allows them to seamlessly run applications across their on-premises infrastructure and AWS, using consistent management tools and APIs. The company also needs a dedicated, private network connection between the two environments for low latency and security. Which cloud deployment model best describes this architecture?

Accepted Answer

Hybrid cloud. The architecture described combines on-premises infrastructure with AWS cloud resources, connected via a dedicated private network (likely AWS Direct Connect or VPN), while using consistent management tools and APIs. This is the defining characteristic of a hybrid cloud model, which enables workload portability and unified operations across both environments.

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Public cloud

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Private cloud

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Community cloud

Question 6

A company runs a monthly data processing job that requires 100 Amazon EC2 instances to complete within 4 hours. The job is not needed at any other time. The company previously ran this job on its on-premises servers, which required maintaining enough capacity to handle the peak load year-round, leading to low average utilization. The company has now migrated the job to AWS. Each month, the company automatically provisions the 100 instances, runs the job, and then terminates the instances. Which essential characteristic of cloud computing does this scenario best illustrate?

Accepted Answer

Rapid elasticity. This scenario best illustrates rapid elasticity because the company provisions 100 EC2 instances only when needed for the monthly job, scaling up from zero to 100 instances in minutes and then scaling back down to zero after the job completes. Rapid elasticity allows cloud resources to be quickly scaled out (increased) and scaled in (decreased) to match demand, eliminating the need to maintain idle capacity for peak loads.

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Resource pooling

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Measured service

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On-demand self-service

Question 7

A company is moving its on-premises workloads to AWS. The company's chief financial officer notes that AWS can provide computing resources at a lower cost per unit because AWS spreads the cost of building and maintaining vast data centers across millions of customers. This cost advantage is best described as an example of which concept?

Accepted Answer

Economies of scale. Economies of scale occur when a provider like AWS spreads the fixed costs of building and operating massive data centers across a huge number of customers, reducing the per-unit cost of compute, storage, and networking. This allows AWS to offer lower prices than a single company could achieve by running its own on-premises infrastructure. The CFO's observation directly describes this principle: AWS's aggregated demand drives down the average cost per resource.

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Resource pooling

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Measured service

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Broad network access

Question 8

A company uses Amazon EC2 instances and Amazon S3 for its workloads. The finance team reviews the monthly AWS bill and notices it includes line items for EC2 instance hours, data transfer out from EC2, and S3 storage usage. The bill shows exactly how many hours each instance ran and how much data was transferred. The company uses this detailed usage data to allocate costs to different departments and to optimize resource utilization. This scenario best demonstrates which essential characteristic of cloud computing?

Accepted Answer

Measured service. (Measured service) because the scenario explicitly describes how the company uses detailed usage data—EC2 instance hours, data transfer out, and S3 storage—to allocate costs and optimize resource utilization. This aligns with the cloud computing characteristic where resource usage is metered, monitored, and reported transparently, enabling pay-per-use billing and cost allocation.

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On-demand self-service

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Broad network access

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Resource pooling

Question 9

A company runs a customer-facing web application on a single Amazon EC2 instance. To ensure the application remains accessible if the instance fails, the company launches a second EC2 instance in a different Availability Zone and configures an Application Load Balancer to distribute traffic. The application continues to serve users with minimal downtime during the failure of any single instance. This scenario best demonstrates which cloud computing concept?

Accepted Answer

High availability. High availability is the correct concept because the architecture uses redundant EC2 instances in separate Availability Zones behind an Application Load Balancer to eliminate a single point of failure. If one instance fails, the load balancer automatically routes traffic to the healthy instance, ensuring the application remains accessible with minimal downtime. This design specifically addresses fault tolerance and uptime, not the ability to handle variable load or scale resources.

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Elasticity

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Scalability

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Fault tolerance

Question 10

A global gaming company needs to deploy its application in multiple geographic locations to reduce latency for players worldwide. The application must also remain available even if an entire data center fails. The company plans to run the application on Amazon EC2 instances behind an Application Load Balancer. Which combination of AWS global infrastructure components should the company use to meet these requirements?

Accepted Answer

Deploy the application in multiple AWS Regions, each with at least two Availability Zones, and use Amazon Route 53 for DNS-based routing.. Deploying the application in multiple AWS Regions, each with at least two Availability Zones, ensures global low latency by placing compute resources closer to players worldwide, while the multi-AZ architecture within each Region provides high availability even if an entire data center (Availability Zone) fails. Amazon Route 53 then enables DNS-based routing (e.g., latency-based or geolocation routing) to direct player traffic to the optimal Region, meeting both latency and fault tolerance requirements.

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Deploy the application in a single AWS Region across multiple Availability Zones and use Amazon Route 53 with latency-based routing.

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Deploy the application in a single AWS Region within a single Availability Zone and use Amazon CloudFront for content caching.

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Deploy the application in multiple AWS Regions and use Amazon CloudFront with multiple origins, each pointing to an Application Load Balancer in a single Availability Zone.

Question 11

A company runs multiple containerized applications on a single Amazon ECS cluster using AWS Fargate. The company's compliance team asks whether sharing the same underlying physical hardware with other AWS customers introduces security risks. The company explains that AWS isolates each customer's compute environment, even though resources are drawn from a shared pool. Which essential characteristic of cloud computing does this arrangement best illustrate?

Accepted Answer

Resource pooling. Resource pooling is the cloud characteristic where a provider's computing resources are pooled to serve multiple customers using a multi-tenant model, with physical and virtual resources dynamically assigned and reassigned according to consumer demand. AWS Fargate abstracts the underlying infrastructure, so even though containers run on shared physical hardware, each customer's compute environment is isolated at the hypervisor and kernel level. This arrangement directly illustrates resource pooling because the provider manages the shared pool while ensuring logical separation between tenants.

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Rapid elasticity

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Measured service

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On-demand self-service

Question 12

A retail company runs a web application on Amazon EC2 instances behind an Application Load Balancer. During a promotional event, traffic spikes to 10 times the normal level. The company configured an Amazon EC2 Auto Scaling group with a scaling policy that adds instances when CPU utilization exceeds 70% and removes instances when it drops below 30%. The application handles the spike without any manual intervention, and after the event ends, the number of instances automatically decreases to the original count, saving costs. This scenario best demonstrates which cloud computing concept?

Accepted Answer

Elasticity. The scenario describes the system automatically scaling out to 10 times the normal capacity during a traffic spike and then scaling back down when the spike ends, which is the definition of elasticity—the ability to dynamically provision and de-provision resources to match demand. The use of an EC2 Auto Scaling group with a CPU-based scaling policy (70% threshold to add, 30% to remove) directly demonstrates this cloud computing concept, as it handles variable workloads without manual intervention and optimizes cost by reducing resources when they are no longer needed.

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Scalability

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High availability

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Fault tolerance

Question 13

A company uses AWS to run its web application. A developer needs to add additional storage capacity to an Amazon EC2 instance that hosts the application's database. The developer logs in to the AWS Management Console, navigates to the Amazon EC2 dashboard, creates a new Amazon EBS volume, attaches it to the instance, and mounts it within the operating system. The entire process takes less than 10 minutes and does not require any interaction with AWS support or approval from the IT department. Which essential characteristic of cloud computing does this scenario best demonstrate?

Accepted Answer

On-demand self-service. The developer was able to provision and attach an EBS volume to an EC2 instance entirely through the AWS Management Console without requiring any human interaction with AWS support or IT approval. This ability to independently request and configure computing resources as needed is the defining characteristic of on-demand self-service, as defined by the NIST definition of cloud computing.

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Resource pooling

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Broad network access

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Measured service

Question 14

A financial services company must keep customer financial records on-premises to comply with data residency regulations. The company wants to use AWS services such as Amazon SageMaker and Amazon Athena to run analytics on anonymized subsets of the data. The company establishes a dedicated AWS Direct Connect connection between its on-premises data center and its VPC, and uses AWS Storage Gateway to cache frequently accessed data locally while storing all data in Amazon S3. Which cloud deployment model does this architecture represent?

Accepted Answer

Hybrid cloud. This architecture combines on-premises infrastructure (customer data center with AWS Storage Gateway caching) with AWS cloud services (SageMaker, Athena, S3) connected via AWS Direct Connect, which is the defining characteristic of a hybrid cloud deployment. A hybrid cloud model integrates private on-premises resources with public cloud services, allowing data to remain on-premises for compliance while leveraging cloud analytics.

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Public cloud

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Private cloud

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Community cloud

Question 15

A company runs a monthly batch data analytics job that requires 50 compute instances for exactly 2 hours. On AWS, the company launches 50 Amazon EC2 instances, runs the job, and then terminates all instances. The company's AWS bill shows a charge for only 100 instance-hours (50 instances × 2 hours). Which essential characteristic of cloud computing does this billing model best demonstrate?

Accepted Answer

Measured service. The billing model charges only for the actual compute time consumed (100 instance-hours), which is a direct application of the 'measured service' characteristic. Measured service means cloud providers meter and bill customers based on actual resource usage (e.g., EC2 instance-hours, storage GB-months), enabling pay-as-you-go pricing. In this scenario, the company is charged precisely for the 50 instances × 2 hours of runtime, with no upfront or fixed costs, demonstrating usage-based metering.

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Resource pooling

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On-demand self-service

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Rapid elasticity