CLF-C02 Cloud Concepts Practice Test 2 — 15 Questions

Question 1

A startup runs an e-commerce website on AWS. During flash sales, traffic can increase 10x in a few minutes. The startup uses an Auto Scaling group to automatically launch additional EC2 instances when CPU utilization exceeds 70% and terminate them when utilization drops below 30%. This approach ensures that the application always has enough capacity to handle the load without manual intervention, and they only pay for what they use. Which cloud computing concept does this scenario BEST illustrate?

Accepted Answer

Elasticity. Option B is correct because elasticity is the ability of a cloud system to automatically scale resources up or down based on demand. The Auto Scaling group dynamically adds EC2 instances when CPU utilization exceeds 70% and terminates them when it drops below 30%, ensuring capacity matches load without manual intervention. This pay-per-use model is a hallmark of elasticity, not just high availability or fault tolerance.

Answer

High availability

Answer

Fault tolerance

Answer

Disaster recovery

Question 2

A company's finance team receives a detailed monthly report from AWS that shows the exact number of Amazon EC2 instance hours used, the amount of Amazon S3 storage consumed, and the volume of data transferred out to the internet over the month. The team uses this report to analyze usage trends, allocate costs to different departments, and plan future budgets. This capability is an example of which essential characteristic of cloud computing?

Accepted Answer

Measured service. The correct answer is D, Measured service. This characteristic means cloud providers automatically meter and report resource usage (e.g., EC2 instance hours, S3 storage, data transfer) for billing, optimization, and planning. The finance team's ability to analyze exact usage data and allocate costs directly demonstrates this metering capability.

Answer

On-demand self-service

Answer

Broad network access

Answer

Resource pooling

Question 3

A startup company is developing a new mobile application. The development team needs to quickly provision and tear down test environments to experiment with different backend configurations. They want to try new features, run performance tests for a few hours, and then delete all resources without any upfront commitment. They only pay for the compute and storage resources consumed during each test. Which benefit of cloud computing does this scenario BEST represent?

Accepted Answer

Agility. The scenario describes provisioning test environments on demand, running experiments for a few hours, and then tearing everything down with no upfront commitment. This directly maps to agility—the cloud's ability to rapidly create, modify, and delete resources to adapt to changing business or technical needs. The pay-as-you-go model further reinforces agility by removing the need for long-term contracts or hardware procurement.

Answer

Elasticity

Answer

High availability

Answer

Fault tolerance

Question 4

A global company has employees who work from various locations and use different devices such as laptops, tablets, and smartphones to access corporate applications. The company plans to migrate its applications to AWS and wants all employees to access these applications directly from the internet using standard web browsers without requiring any dedicated hardware or software at each branch. Which essential characteristic of cloud computing does this scenario BEST demonstrate?

Accepted Answer

Broad network access. The scenario describes employees accessing corporate applications from various devices and locations using only standard web browsers, without dedicated hardware or software. This directly aligns with the cloud computing characteristic of broad network access, which mandates that resources are accessible over the network by standard mechanisms (e.g., HTTPS, TLS 1.2/1.3) from heterogeneous client platforms (laptops, tablets, smartphones). The key is that no site-to-site VPN appliances or thick client software are required—just a browser and an internet connection.

Answer

Measured service

Answer

Resource pooling

Answer

Rapid elasticity

Question 5

A company runs its production web application on a single Amazon EC2 instance located in one Availability Zone. Recently, a power outage in that data center caused the instance to become unavailable, resulting in application downtime. The company wants to redesign the architecture so that the application automatically continues serving users even if a single data center fails, without requiring manual intervention. Which cloud computing concept does this scenario BEST illustrate?

Accepted Answer

High availability. High availability (B) is the correct concept because the scenario describes designing an architecture that automatically continues serving users even if a single data center (Availability Zone) fails, without manual intervention. This is achieved by deploying the application across multiple Availability Zones, using an Elastic Load Balancer to distribute traffic, and configuring Auto Scaling groups to maintain instance health, ensuring the application remains accessible despite a zonal failure.

Answer

Elasticity

Answer

On-demand self-service

Answer

Broad network access

Question 6

A start-up is evaluating cloud providers for its new application. The company's CTO learns that the cloud provider negotiates bulk discounts with hardware vendors and data center operators, and passes these savings on to customers through lower service prices. The CTO also notes that the provider's vast infrastructure allows customers to benefit from the provider's operational expertise in running large-scale data centers. Which benefit of cloud computing does this scenario BEST represent?

Accepted Answer

Economies of scale. Economies of scale occur when a cloud provider achieves lower per-unit costs by operating at a massive scale. The provider purchases hardware in bulk, optimizes data center operations, and leverages expertise across many customers. These savings are then reflected in lower prices for all customers. The scenario directly describes this benefit—lower prices from bulk purchasing and operational expertise passed on to the customer.

Answer

Pay-as-you-go pricing

Answer

Resource pooling

Answer

High availability

Question 7

A cloud provider uses shared physical infrastructure to serve many customers. Each customer's compute and storage resources are logically isolated and secure, but the underlying hardware is pooled across all customers. Which essential characteristic of cloud computing does this scenario BEST describe?

Accepted Answer

Resource pooling. Resource pooling is the correct characteristic because the scenario describes a multi-tenant model where physical and virtual resources are dynamically assigned and reassigned according to consumer demand. The cloud provider's shared infrastructure (compute, storage, network) is pooled to serve multiple customers, with logical isolation ensuring each customer's data remains secure despite the shared underlying hardware. This directly matches the NIST SP 800-145 definition of resource pooling.

Answer

On-demand self-service

Answer

Broad network access

Answer

Rapid elasticity

Question 8

A company is migrating its IT operations to AWS. Previously, when a developer needed a new server for a project, the developer had to submit a formal request to the IT department. The request would be reviewed, approved, and then a physical server would be procured, configured, and deployed—a process that often took several weeks. After migrating to AWS, the developer can log in to the AWS Management Console and launch a new Amazon EC2 instance with the exact required configuration within minutes, without any interaction with IT staff. Which essential characteristic of cloud computing does this scenario BEST demonstrate?

Accepted Answer

On-demand self-service. The scenario describes a developer provisioning an EC2 instance directly via the AWS Management Console without any human intervention from IT staff. This aligns with the NIST-defined characteristic of on-demand self-service, where a consumer can unilaterally provision computing capabilities as needed automatically without requiring human interaction with each service provider.

Answer

Broad network access

Answer

Resource pooling

Answer

Measured service

Question 9

A company runs a web application on AWS that experiences unpredictable traffic spikes. The company wants to configure its infrastructure to automatically increase compute capacity during peak times and decrease it during low traffic, minimizing costs. Which cloud computing concept does this scenario BEST represent?

Accepted Answer

Elasticity. Elasticity is the ability of a cloud system to automatically provision and de-provision compute resources in response to real-time demand. In this scenario, AWS Auto Scaling groups can dynamically launch EC2 instances during traffic spikes and terminate them when demand drops, directly matching capacity to load while minimizing cost. This contrasts with static provisioning, which would either over-provision (wasting money) or under-provision (causing outages).

Answer

High availability

Answer

Fault tolerance

Answer

Vertical scaling

Question 10

A company's sales team uses a cloud-based CRM application. Sales representatives access the CRM from their laptops in the office, from tablets at customer sites, and from their smartphones while traveling, all over the internet. The application works consistently across all devices without requiring any custom client software on each device. Which essential characteristic of cloud computing does this scenario BEST demonstrate?

Accepted Answer

Broad network access. The scenario describes sales representatives accessing the CRM application from laptops, tablets, and smartphones over the internet without needing custom client software. This directly illustrates broad network access, which is the cloud computing characteristic that resources are available over the network and can be accessed by standard mechanisms (e.g., HTTPS, REST APIs) from a wide range of heterogeneous client platforms (e.g., mobile phones, tablets, laptops). The consistent experience across devices without custom software is the hallmark of broad network access.

Answer

On-demand self-service

Answer

Resource pooling

Answer

Measured service

Question 11

A company is migrating its on-premises data analytics workload to AWS. Previously, the company had to purchase and maintain dedicated servers with fixed capacity to handle peak workloads, resulting in low utilization during off-peak hours. On AWS, the company can launch compute resources, run the analytics job, and terminate the resources when done. The company only pays for the compute time and storage used during the job. Which essential characteristic of cloud computing does this scenario BEST demonstrate?

Accepted Answer

Measured service. Measured service is the cloud characteristic that enables pay-as-you-go pricing by metering resource usage (compute time, storage) and billing only for what is consumed. In this scenario, the company launches resources for the analytics job, runs it, and terminates them, paying solely for the compute time and storage used — a direct demonstration of metered usage and cost transparency.

Answer

Rapid elasticity

Answer

Resource pooling

Answer

On-demand self-service

Question 12

A company is designing a highly available application that must remain operational even if a single physical data center fails. The application will be deployed in the us-east-1 Region. The company wants to distribute the application across multiple physical locations within the Region, where each location has independent power, cooling, and networking. Which AWS Global Infrastructure component should the company use to meet this requirement?

Accepted Answer

Availability Zone. Availability Zones (AZs) are distinct physical locations within an AWS Region, each with independent power, cooling, and networking, and are interconnected through low-latency links. By deploying the application across multiple AZs, the company ensures high availability and fault tolerance against the failure of a single physical data center. This directly meets the requirement to remain operational even if one physical data center fails.

Answer

AWS Region

Answer

Edge Location

Answer

Local Zone

Question 13

A company hosts a web application on an Amazon EC2 instance. The company installs its own application software and configures the operating system. The company also uses AWS Key Management Service (AWS KMS) to create a customer-managed key to encrypt data on the Amazon Elastic Block Store (Amazon EBS) volume attached to the instance. According to the AWS shared responsibility model, which of the following is the responsibility of AWS?

Accepted Answer

Ensuring the physical security of the data center where the Amazon EC2 instance runs.. Option C is correct because under the AWS shared responsibility model, AWS is responsible for the security of the cloud, which includes the physical security of data centers, hardware, networking, and facilities where EC2 instances run. This is a foundational layer that customers cannot manage or control.

Answer

Encrypting the data on the Amazon EBS volume using the customer-managed key.

Answer

Patching the operating system of the Amazon EC2 instance.

Answer

Configuring the security group rules to restrict traffic to the Amazon EC2 instance.

Question 14

A company moves its infrastructure to AWS. The company's IT team notices that they have no control over which specific physical server their virtual machines run on, and they are unaware of the exact hardware location except at the regional level. The underlying physical resources are shared across multiple AWS customers. Which essential characteristic of cloud computing does this scenario BEST describe?

Accepted Answer

Resource pooling. Option C is correct because resource pooling is the cloud characteristic where the 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 customer demand. The scenario describes the customer having no control over the exact physical server or hardware location beyond the regional level, which is the essence of resource pooling. This allows AWS to achieve economies of scale while abstracting the underlying hardware from the customer.

Answer

On-demand self-service

Answer

Broad network access

Answer

Rapid elasticity

Question 15

A company runs a web application on Amazon EC2 instances. The application experiences unpredictable traffic spikes during marketing campaigns. The company configures an Amazon EC2 Auto Scaling group to automatically add instances when CPU utilization exceeds 70% and remove instances when it drops below 30%. This allows the company to handle peak loads without manual intervention and avoid paying for idle capacity during low traffic periods. Which essential characteristic of cloud computing does this configuration BEST demonstrate?

Accepted Answer

Rapid elasticity. The Auto Scaling group dynamically adjusts the number of EC2 instances in response to CPU utilization thresholds, scaling out during traffic spikes and scaling in during low traffic. This ability to rapidly provision and release compute resources to match demand is the defining characteristic of rapid elasticity, which allows the company to handle peak loads without manual intervention and avoid paying for idle capacity.

Answer

On-demand self-service

Answer

Broad network access

Answer

Measured service