CCNA Cloud Concepts Questions — Page 4 of 4

226

MCQmedium

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?

A.Resource pooling

B.Measured service

C.On-demand self-service

D.Rapid elasticity

AnswerB

Measured service means that cloud resource usage is metered, monitored, controlled, and reported, enabling a pay-per-use billing model. In this scenario, the company is charged exactly for the 100 instance-hours consumed, which is a direct application of measured service.

Why this answer

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.

Exam trap

The trap here is that candidates confuse 'measured service' (usage-based billing) with 'rapid elasticity' (scaling speed), but the question explicitly focuses on the billing charge for exactly the hours used, not the ability to scale quickly.

Why the other options are wrong

Resource pooling refers to the provider's ability to serve multiple customers from shared physical resources, but the billing model described (charging only for actual usage) directly demonstrates measured service, not resource pooling.

On-demand self-service refers to the ability to provision resources without human interaction, but the billing model in the question (charging only for actual usage) demonstrates measured service, not self-service.

The billing model charges only for actual usage (100 instance-hours), which directly demonstrates 'measured service' (metering and charging based on consumption). 'Rapid elasticity' refers to the ability to quickly scale resources up or down, not to how usage is billed.

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227

MCQmedium

A company is adopting the cloud and wants to improve operational efficiency by treating their infrastructure as code. Which AWS service allows them to define and provision AWS infrastructure using JSON or YAML templates?

A.AWS Systems Manager

B.AWS CloudFormation

C.AWS OpsWorks

D.AWS Config

AnswerB

AWS CloudFormation is the native infrastructure-as-code service that lets you define every AWS resource in a declarative JSON or YAML template. CloudFormation treats those templates as a single stack, automatically handling dependency ordering, rollback on failure, and updates, which makes resource provisioning consistent and repeatable across environments. Because the question asks for a service that provisions infrastructure stacks in this way, CloudFormation is the correct choice.

Why this answer

AWS CloudFormation is the correct service because it allows you to define and provision AWS infrastructure as code using JSON or YAML templates. This enables repeatable, version-controlled deployments, directly supporting the goal of improving operational efficiency through infrastructure as code.

Exam trap

The trap here is that candidates may confuse AWS CloudFormation with AWS OpsWorks or AWS Systems Manager, as both can manage infrastructure but use different paradigms (declarative templates vs. configuration management) and are not designed for JSON/YAML-based infrastructure provisioning.

How to eliminate wrong answers

Option A is wrong because AWS Systems Manager is a management service for operational tasks like patching and configuration, not for defining infrastructure as code with templates. Option C is wrong because AWS OpsWorks is a configuration management service using Chef and Puppet, not JSON/YAML templates for infrastructure provisioning. Option D is wrong because AWS Config is a service for evaluating and auditing resource compliance, not for defining or provisioning infrastructure.

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228

MCQeasy

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?

A.Measured service

B.Resource pooling

C.Broad network access

D.Rapid elasticity

AnswerC

Broad network access is a core cloud characteristic that allows resources to be accessed over the network using standard protocols (such as HTTP/HTTPS) from a wide range of client devices (laptops, tablets, smartphones). This aligns directly with the requirement for employees to access applications via standard web browsers from various devices without dedicated hardware or software.

Why this answer

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.

Exam trap

The trap here is that candidates confuse 'broad network access' with 'resource pooling' because both involve multi-device scenarios, but broad network access is specifically about the accessibility of services over the internet using standard protocols, not about how resources are shared among tenants.

Why the other options are wrong

The scenario emphasizes accessing applications from any device via standard web browsers without dedicated hardware, which is 'broad network access.' 'Measured service' refers to metering and billing based on usage, not ubiquitous access.

Resource pooling refers to the provider's computing resources being pooled to serve multiple customers, with physical and virtual resources dynamically assigned. This scenario focuses on employees accessing applications from any device via a standard web browser, which demonstrates broad network access, not resource pooling.

Rapid elasticity refers to the ability to quickly scale resources up or down based on demand, which is not demonstrated in this scenario. The scenario focuses on employees accessing applications from various devices and locations via standard web browsers, which exemplifies broad network access, not elasticity.

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229

MCQhard

A company is designing a cloud architecture and wants to follow the Well-Architected Framework principle of 'stop guessing capacity.' Which AWS feature directly supports this principle?

A.AWS CloudFormation for repeatable deployments

B.Amazon EC2 Auto Scaling based on CloudWatch metrics

C.AWS Trusted Advisor cost optimization checks

D.AWS Cost Explorer right-sizing recommendations

AnswerB

Amazon EC2 Auto Scaling uses CloudWatch metrics such as CPU utilization, network traffic, or custom application metrics to automatically add or remove EC2 instances to maintain a desired performance level. With target tracking policies, you can set an average utilization target and the service continuously adjusts capacity to match actual demand, preventing both over-provisioning waste and under-provisioning slowdowns. This makes it the correct choice for automatically adjusting capacity based on demand.

Why this answer

Amazon EC2 Auto Scaling directly supports the 'stop guessing capacity' principle by automatically adjusting the number of EC2 instances in response to real-time demand using CloudWatch metrics (e.g., CPU utilization, memory). This eliminates the need to manually provision for peak loads, ensuring you only pay for what you need while maintaining performance.

Exam trap

The trap here is that candidates confuse 'stop guessing capacity' with cost optimization tools like Cost Explorer or Trusted Advisor, but the principle is specifically about dynamic scaling to match demand, not about analyzing or reducing costs after the fact.

How to eliminate wrong answers

Option A is wrong because AWS CloudFormation enables repeatable infrastructure deployments via templates, but it does not dynamically adjust capacity based on demand; it provisions static resources. Option C is wrong because AWS Trusted Advisor cost optimization checks provide recommendations to reduce costs (e.g., idle instances), but they do not automatically scale capacity to match workload changes. Option D is wrong because AWS Cost Explorer right-sizing recommendations analyze historical usage to suggest instance type changes, but they are advisory and do not provide real-time, automated scaling to handle fluctuating demand.

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230

MCQeasy

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?

A.On-demand self-service

B.Broad network access

C.Resource pooling

D.Measured service

AnswerA

Correct. On-demand self-service allows users to provision and manage computing resources as needed without requiring human interaction with the service provider. The developer's ability to launch an EC2 instance directly from the AWS Management Console without IT involvement is a clear example of this characteristic.

Why this answer

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.

Exam trap

The trap here is that candidates confuse 'on-demand self-service' with 'resource pooling' because both involve rapid provisioning, but the key differentiator is the absence of human interaction with the provider (IT staff) versus the multi-tenant sharing of resources.

Why the other options are wrong

Broad network access refers to capabilities being available over the network and accessed by standard mechanisms, not to the ability to provision resources without human interaction. The scenario emphasizes self-provisioning, not network accessibility.

Resource pooling refers to multi-tenant computing resources that are dynamically assigned and reassigned to serve multiple customers, which is not demonstrated by a single developer provisioning a server without IT interaction.

The scenario emphasizes the ability to provision resources without human interaction, which is on-demand self-service. Measured service refers to metering and billing based on usage, not the provisioning process.

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231

MCQmedium

A company is moving its workloads to AWS. The compliance team requires that all data must reside within the European Union (EU) and must not be stored on any physical server located outside the EU. The team also understands that AWS does not provide information about the specific physical server or data center where their data is stored. Which essential characteristic of cloud computing does this situation best describe?

A.On-demand self-service

B.Broad network access

C.Resource pooling

D.Rapid elasticity

AnswerC

Resource pooling means the provider's compute, storage, network, and other resources are pooled to serve many customers, with the customer having no knowledge or control over the exact physical location of the resources. The customer can specify location at a higher level (e.g., a specific Region or country), which meets the compliance requirement of keeping data within the EU.

Why this answer

Resource pooling allows AWS to serve multiple customers from shared physical resources, with the provider abstracting the exact physical server location. The compliance requirement that data must reside only in the EU is satisfied by selecting an EU Region (e.g., eu-west-1), but AWS does not disclose the specific physical server or data center within that Region, which is a direct consequence of resource pooling—the provider's multi-tenant model hides the underlying hardware details from the customer.

Exam trap

The trap here is that candidates confuse 'resource pooling' with 'data residency' or 'compliance controls,' mistakenly thinking that choosing a Region alone satisfies the requirement, when the question specifically tests the cloud characteristic that explains why AWS does not disclose the exact physical server—resource pooling.

Why the other options are wrong

On-demand self-service refers to a user's ability to provision computing resources without human interaction, not to data residency or physical server location constraints.

Broad network access refers to the ability to access cloud resources over the network via standard protocols, not to data residency or physical server location constraints.

Rapid elasticity refers to the ability to quickly scale resources up or down based on demand, not to data residency or physical server location constraints.

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232

MCQmedium

A company runs a batch processing workload on an on-premises data center. The servers are powerful machines that are used at maximum capacity only for a few days each month during financial reporting periods. For the rest of the month, the servers run at very low utilization. The CFO wants to migrate this workload to AWS to reduce costs. Which characteristic of AWS cloud computing is most directly aligned with the CFO's goal of paying only for the compute capacity actually used?

A.High availability across multiple Availability Zones

B.Elasticity to automatically scale resources up and down

C.Pay-as-you-go pricing model

D.The ability to choose from a wide variety of instance types

AnswerC

The pay-as-you-go model lets customers pay only for the compute capacity they actually use, with no upfront capital expenditure or charges for idle resources. This directly meets the CFO's objective of eliminating costs for underutilized on-premises servers.

Why this answer

The pay-as-you-go pricing model (Option C) directly aligns with the CFO's goal because it allows the company to pay only for the compute capacity they actually consume, with no upfront costs or long-term commitments. In this scenario, the batch processing workload runs at maximum capacity only a few days per month, so the company can provision resources during those peaks and stop them during low-utilization periods, avoiding the cost of idle on-premises servers. This model eliminates the need to pay for unused capacity, directly reducing costs as the CFO desires.

Exam trap

The trap here is that candidates confuse elasticity (the ability to scale) with the pay-as-you-go pricing model, but elasticity is a characteristic that enables cost optimization, while pay-as-you-go is the specific billing mechanism that directly ensures you pay only for what you use.

Why the other options are wrong

High availability ensures system uptime and fault tolerance, but does not directly relate to paying only for used compute capacity; the CFO's goal is cost reduction based on usage, not availability.

The question asks for the characteristic most directly aligned with paying only for compute capacity actually used, which is the pay-as-you-go pricing model. Elasticity enables scaling but does not itself determine the pricing model; you could have elasticity but still pay for reserved capacity.

The question asks for the characteristic most directly aligned with paying only for compute capacity actually used. While choosing from a wide variety of instance types can help optimize costs, it does not directly enable paying only for what you use; that is the pay-as-you-go model.

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233

MCQmedium

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?

A.Resource pooling

B.Economies of scale

C.Measured service

D.Broad network access

AnswerB

Correct. Economies of scale occur when the average cost per unit decreases as the scale of operations increases. AWS spreads its massive infrastructure investments across millions of customers, enabling lower per-unit costs than a single company could achieve on its own.

Why this answer

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.

Exam trap

The trap here is confusing economies of scale with resource pooling, as both involve shared infrastructure, but economies of scale specifically refer to the cost reduction from large-scale operations, not the multi-tenant resource allocation model.

Why the other options are wrong

Resource pooling refers to the provider's ability to serve multiple customers from shared physical resources, but the cost advantage described in the question is specifically due to the scale of operations lowering per-unit costs, which is economies of scale.

Measured service refers to the ability to monitor and control resource usage (pay-per-use), not the cost advantage from spreading infrastructure costs across many customers.

Broad network access refers to the ability to access cloud resources over the network via standard protocols, not to cost advantages from shared infrastructure.

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