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Question 1081Question →

FinTechFlow runs a weekly risk assessment simulation that requires 2020 high-performance servers for 44 hours every Sunday. During the rest of the week, the system is idle. The company currently maintains 2020 physical servers in an on-premises data center to support this simulation. Which of the following describes the primary cloud economics benefit that FinTechFlow will realize by migrating this workload to AWS?

Show answer & explanation

Answer: The opportunity to pay only for the compute resources consumed during the 4-hour simulation, shifting from upfront capital expenses to variable operating expenses.

Answer

The opportunity to pay only for the compute resources consumed during the 4-hour simulation, shifting from upfront capital expenses to variable operating expenses.
The correct option describes the core benefit of trading capital expenses for variable operating expenses under a pay-as-you-go model. Because the simulation only runs for 4 hours a week, FinTechFlow only pays for the 20 instances during those 4 hours rather than purchasing and maintaining physical servers that sit idle for the rest of the week.

Step-by-Step Solution

1
Analyze the workload characteristics in the scenario.
The simulation workload is highly variable and runs for only 44 hours per week, remaining idle for the other 164164 hours.
Understanding workload patterns helps identify potential cost savings from pay-as-you-go models.
2
Evaluate the financial shift from on-premises hosting to AWS cloud hosting.
On-premises requires upfront capital expense (CapEx) for physical servers, whereas AWS allows paying for resources as variable operating expenses (OpEx) only when they are running.
Trading CapEx for OpEx is a fundamental economic benefit of cloud computing.

Key Concept

Trading capital expenses for variable operating expenses and leveraging elasticity to minimize costs.
Estimated Time:1m 30s
Question 1082Question →

A logistics company is planning to migrate three distinct workloads to Amazon EC2:

* Workload A: A microservices platform running continuously that will initially deploy in the us-east-1 Region, but is scheduled to migrate to the us-west-2 Region in six months.
* Workload B: A daily stateful data synchronization task that runs for exactly 2 hours each night and cannot tolerate any interruptions.
* Workload C: A stateless, containerized image-processing batch job that can run at any time, can be paused and resumed, and scales dynamically based on queue depth.

Which combination of EC2 pricing models provides the most cost-effective solution for these workloads?

Show answer & explanation

Answer: Compute Savings Plan for Workload A; On-Demand Instances for Workload B; Spot Instances for Workload C

Answer

Compute Savings Plan for Workload A; On-Demand Instances for Workload B; Spot Instances for Workload C
The correct choice combines a Compute Savings Plan for Workload A, On-Demand Instances for Workload B, and Spot Instances for Workload C. A Compute Savings Plan provides the flexibility to apply discounts across different AWS Regions (from us-east-1 to us-west-2), which an EC2 Instance Savings Plan cannot do. On-Demand Instances are the most cost-effective for Workload B because it only runs for 2 hours a day; committing to a Savings Plan would result in paying for 22 unused hours daily, and Spot Instances cannot be used since the workload is stateful and cannot tolerate interruptions. Spot Instances are ideal for Workload C because it is stateless and fault-tolerant, allowing for maximum cost savings.

Step-by-Step Solution

1
Analyze Workload A requirements
Workload A runs continuously (requiring a committed discount) but shifts regions from us-east-1 to us-west-2. Compute Savings Plans provide the necessary regional flexibility, whereas EC2 Instance Savings Plans are locked to a specific region.
To ensure discount applicability post-migration across regions.
2
Analyze Workload B requirements
Workload B runs for only 2 hours daily and is stateful (cannot tolerate interruptions). Spot Instances are ruled out. A Savings Plan or Reserved Instance charges for 24 hours a day, meaning 22 hours of waste. On-Demand is the most cost-effective option here.
To avoid paying for continuous idle capacity for a short-duration daily task.
3
Analyze Workload C requirements
Workload C is stateless, containerized, and fault-tolerant, making it a perfect fit for Spot Instances which offer up to 90% savings.
To maximize cost savings on interruptible batch processing.
4
Select the correct combination
The correct combination is Compute Savings Plan (Workload A), On-Demand Instances (Workload B), and Spot Instances (Workload C).
This matches the requirements of all three workloads perfectly.

Key Concept

AWS EC2 pricing model selection based on workload flexibility, duration, and fault tolerance.
Question 1083Question →

A company wants to record the configuration history of its AWS resources and automatically check if these configurations comply with the company's internal security guidelines. Which AWS service should the company use to meet this requirement?

Show answer & explanation

Answer: AWS Config

Answer

AWS Config
AWS Config is designed to record configurations of AWS resources and evaluate them against desired compliance guidelines.

Step-by-Step Solution

1
Analyze the core business requirement
The company needs to track changes in resource configurations over time and compare those configurations to compliance rules.
This establishes the type of service needed: configuration tracking and compliance management.
2
Select the AWS service that handles configuration compliance
AWS Config matches the requirements precisely.
AWS Config tracks configuration changes of AWS resources and evaluates them against custom or managed compliance rules.

Key Concept

Continuous monitoring and configuration auditing using AWS Config
Estimated Time:45s
Question 1084Question →

A media streaming company needs to analyze their past bandwidth usage patterns over the last six months to identify cost-saving opportunities. Additionally, they want to receive email alerts if their monthly data transfer costs are projected to exceed a specific threshold. Which two AWS Billing and Cost Management tools should the company use to meet these requirements? (Select TWO)

Select all that apply

Show answer & explanation

Answer: AWS Cost Explorer; AWS Budgets

Answer

AWS Cost Explorer and AWS Budgets
AWS Cost Explorer is the correct choice for analyzing past cost and usage trends (such as bandwidth patterns over the last six months). AWS Budgets is the correct choice for setting up proactive email notifications based on actual or forecasted cost thresholds.

Step-by-Step Solution

1
Identify the tool required for historical cost and usage analysis.
AWS Cost Explorer is selected because it provides visualization and analysis of historical spend (such as the last six months of bandwidth usage patterns).
The requirement is to analyze past usage patterns to identify savings.
2
Identify the tool required for proactive threshold alerting.
AWS Budgets is selected because it allows setting custom thresholds and sending alerts when actual or forecasted costs exceed a set budget limit.
The requirement is to receive email alerts when monthly costs are projected to exceed a specific threshold.

Key Concept

AWS Cost Explorer is used for analyzing historical cost trends, while AWS Budgets is used for setting cost thresholds and receiving proactive notifications.
Estimated Time:1m 0s
Question 1085Question →

A healthcare software company wants to analyze their historical data transfer costs across different AWS Regions over the past year. They also need to view a forecast of their costs for the next three months based on these historical trends to help plan their upcoming budget. Which AWS Billing and Cost Management tool should they use to meet these requirements?

Show answer & explanation

Answer: AWS Cost Explorer

Answer

AWS Cost Explorer
AWS Cost Explorer is correct because it is the primary AWS tool designed to visualize, analyze, and forecast historical cost and usage data over time, including filtering by attributes like AWS Region.

Step-by-Step Solution

1
Identify the primary operational requirement.
The company needs to analyze actual historical costs (specifically data transfer costs across regions) and generate a multi-month cost forecast based on past trends.
This determines whether a proactive monitoring tool (AWS Budgets), a pre-deployment estimation tool (AWS Pricing Calculator), a billing customization tool (AWS Billing Conductor), or a historical analysis tool (AWS Cost Explorer) is needed.
2
Evaluate the capabilities of AWS Cost Explorer against these requirements.
AWS Cost Explorer is designed to visualize, filter, and analyze historical AWS costs (including by Region or tag) and natively offers a forecasting engine for future costs.
Comparing capabilities shows that AWS Cost Explorer satisfies both the historical filtering and forecasting requirements.

Key Concept

AWS Cost Explorer historical analysis and forecasting capabilities
Estimated Time:1m 30s
Question 1086Question →

An organization is designing a web application to be hosted on AWS. To ensure the application remains highly available and resilient to local physical disasters, such as power outages or flooding, the team wants to leverage AWS infrastructure isolation. Which two statements correctly describe the characteristics of AWS Availability Zones? (Select TWO.)

Select all that apply

Show answer & explanation

Answer: Each Availability Zone consists of one or more discrete data centers with redundant power, networking, and connectivity.; Availability Zones within a single Region are interconnected using high-speed, low-latency, and redundant fiber-optic networks.

Answer

AWS Availability Zones consist of one or more discrete data centers with redundant utility infrastructure, and they are interconnected with high-speed, low-latency, and redundant fiber-optic networks.
Availability Zones are designed to provide high availability and isolation from local failures. To achieve this, each Availability Zone is composed of one or more discrete, physical data centers, each equipped with redundant utility infrastructure. Despite being physically separated, they are interconnected by private, high-speed, low-latency fiber-optic networks to allow applications to failover seamlessly.

Step-by-Step Solution

1
Analyze the role of Availability Zones in AWS Global Infrastructure.
Identify that Availability Zones are designed for high availability, fault tolerance, and physical isolation within a Region.
This helps rule out options that associate them with wider geographic structures like Regions or smaller caching utilities like Edge Locations.
2
Evaluate the statements against the definition and physical properties of Availability Zones.
Confirm that they comprise discrete data centers and are interconnected via low-latency networks, while verifying they do not share common points of failure like power grids.
This validates the two correct answers and eliminates the distractor options.

Key Concept

AWS Availability Zones are isolated locations within a Region designed to provide fault isolation and low-latency replication.
Question 1087Question →

A cloud operations team is tasked with meeting two key requirements:
1. Establish a repeatable process to deploy identical network and database resources across multiple test environments.
2. Build a custom web application in Node.js that needs to programmatically upload user documents to an Amazon S3 bucket.

Which AWS tools or methods should the team use to meet these requirements? (Select TWO.)

Select all that apply

Show answer & explanation

Answer: AWS CloudFormation to define and deploy the infrastructure environments using template files.; AWS Software Development Kit (SDK) to programmatically upload files from the Node.js application.

Answer

AWS CloudFormation and AWS Software Development Kit (SDK)
AWS CloudFormation allows the operations team to write declarative templates that define their infrastructure, enabling consistent and repeatable deployments. The AWS SDK allows the Node.js application to programmatically make API calls to upload user documents to Amazon S3.

Step-by-Step Solution

1
Identify the service for repeating infrastructure deployment.
AWS CloudFormation is the service used to define infrastructure as code (IaC) templates, which makes it easy to repeat deployments across multiple environments.
The first requirement asks for a repeatable process to deploy identical network and database resources.
2
Identify the tool for programmatic interaction with Amazon S3 inside application code.
The AWS Software Development Kit (SDK) provides libraries for Node.js to make API calls to Amazon S3.
The second requirement asks for a programmatic way to upload documents from a Node.js web application.

Key Concept

Selecting the appropriate AWS deployment and operating methods (templates vs. programmatic access).
Question 1088Question →

A company wants to interconnect multiple Virtual Private Clouds (VPCs) and on-premises networks using a single central hub, rather than managing multiple point-to-point connections. Which AWS service should the company use to meet this requirement?

Show answer & explanation

Answer: AWS Transit Gateway

Answer

AWS Transit Gateway
AWS Transit Gateway acts as a cloud router, enabling customers to connect their VPCs and on-premises networks to a single, centrally managed hub. This significantly reduces the operational overhead of managing multiple individual VPC Peering connections and VPN links.

Step-by-Step Solution

1
Analyze the business and technical requirements.
The requirement asks for a service that can interconnect multiple VPCs and on-premises networks through a single central hub, simplifying the network topology.
This rules out direct point-to-point connections (VPC Peering) and host-level or subnet-level firewall rules.
2
Evaluate the capabilities of the options relative to network routing and transit capabilities.
AWS Transit Gateway is the only service listed that is designed as a centralized cloud router to simplify hybrid and multi-VPC connectivity.
It replaces complex peering meshes and provides a single gateway to manage traffic flow to and from all connected networks.

Key Concept

Centralized network routing and transit management in AWS using Transit Gateway.
Estimated Time:45s
Question 1089Question →

A research institution runs high-performance scientific simulations on Amazon EC2 instances within a private subnet. The security team must implement a network security strategy that meets two requirements:

1. Block traffic from a specific range of external IP addresses at the subnet boundary by explicitly evaluating both inbound and outbound traffic.
2. Allow incoming simulation control data to the EC2 instances, ensuring that return traffic is automatically permitted without requiring explicit outbound rules.

Which combination of AWS features best satisfies these requirements?

Show answer & explanation

Answer: Network Access Control Lists (NACLs) at the subnet level to block the IP range, and Security Groups at the instance level to allow the control data

Answer

Network Access Control Lists (NACLs) at the subnet level to block the IP range, and Security Groups at the instance level to allow the control data
The correct answer correctly identifies that Network Access Control Lists (NACLs) operate at the subnet level and are stateless, meaning both inbound and outbound traffic must be explicitly allowed or denied. This makes NACLs ideal for blocking specific IP ranges at the subnet boundary. Security Groups operate at the instance level and are stateful, meaning any allowed inbound traffic automatically permits the corresponding outbound response traffic, satisfying the second requirement.

Step-by-Step Solution

1
Evaluate the first requirement: blocking a specific IP range at the subnet boundary with explicit inbound and outbound evaluation.
This requires a subnet-level firewall that is stateless, meaning outbound traffic must be explicitly evaluated alongside inbound traffic. Network Access Control Lists (NACLs) operate at the subnet level and are stateless.
Stateless firewalls do not track connection states, so both directions of traffic must have explicit rules.
2
Evaluate the second requirement: allowing simulation traffic at the instance level with automatic return traffic permission.
This requires an instance-level firewall that is stateful, meaning response traffic is automatically allowed if the request is permitted. Security Groups operate at the instance level and are stateful.
Stateful firewalls track the state of connections and automatically permit response traffic without needing explicit outbound rules.
3
Combine both components to select the option that uses NACLs at the subnet level and Security Groups at the instance level.
The correct combination uses NACLs for the subnet-level blocklist and Security Groups for instance-level simulation data filtering.
This architecture correctly utilizes the distinct properties of stateful and stateless firewalls at their respective boundaries.

Key Concept

Stateful vs. Stateless network firewalls in a VPC (Security Groups vs. Network ACLs)
Question 1090Question →

A company wants to monitor their monthly Amazon S3 usage and receive an email notification if their data transfer costs are forecasted to exceed 150150. Which AWS Billing and Cost Management tool should they use to set up this alert?

Show answer & explanation

Answer: AWS Budgets

Answer

AWS Budgets
AWS Budgets is the correct tool because it enables customers to set up custom budgets that track their AWS cost and usage, and configure proactive notifications when actual or forecasted metrics exceed a user-defined threshold.

Step-by-Step Solution

1
Analyze the business requirement to determine the type of tool needed.
The requirement calls for a proactive notification (email alert) when a specific cost threshold ($150) is forecasted to be exceeded.
This helps differentiate between planning tools, reactive visualization tools, and active monitoring/alerting tools.
2
Evaluate the capabilities of the AWS Billing and Cost Management tools.
AWS Budgets is the specific tool that enables setting up custom thresholds for cost and usage, and automatically sending notifications when those thresholds are crossed or predicted to be crossed.
This directly fulfills the requirement for threshold alerts, whereas other tools like AWS Cost Explorer are primarily for retroactively analyzing and graphing historical usage.

Key Concept

AWS Budgets vs. AWS Cost Explorer
Estimated Time:45s
Question 1091Question →

A software development firm needs to deploy a continuous integration and testing server environment that will run 24/7 for exactly six weeks to support a critical client release. The test suite is highly sensitive to interruptions, and any failure requires the entire test pipeline to restart from scratch. Which Amazon EC2 pricing model is the most cost-effective choice for this workload?

Show answer & explanation

Answer: On-Demand Instances

Answer

On-Demand Instances
On-Demand Instances are the most cost-effective because the workload is short-term (six weeks) and cannot tolerate interruptions. While Savings Plans and Reserved Instances offer hourly discounts, they require a minimum commitment of one year, meaning the company would pay for idle capacity for the remaining 46 weeks, resulting in a higher total cost. Spot Instances are unsuitable because they can be interrupted by AWS, which would cause the sensitive test suite to fail and restart.

Step-by-Step Solution

1
Analyze the workload duration and continuity requirements.
The workload runs continuously 24/7 but only for a duration of six weeks.
To determine if long-term commitment models are financially viable.
2
Assess the workload's tolerance for interruptions.
The workload cannot tolerate interruptions, as any failure requires restarting the entire pipeline from scratch.
To evaluate if Spot Instances can be safely utilized.
3
Compare the total cost of On-Demand vs. commitment-based models.
A one-year commitment model requires paying for twelve months of usage. Even with hourly discounts, paying for a full year for a six-week project is far more expensive than paying On-Demand rates for only six weeks.
To identify the pricing model that minimizes total expenditures while meeting technical requirements.

Key Concept

Matching workload characteristics (duration, interruption tolerance, predictability) to the optimal AWS EC2 pricing model.
Estimated Time:2m 0s
Question 1092Question →

A real estate platform is migrating its property transaction registry to AWS. The platform must encrypt all sensitive transaction records at rest using AWS Key Management Service (AWS KMS). Under the AWS Shared Responsibility Model, which of the following actions are the responsibility of the customer? (Select TWO.)

Select all that apply

Show answer & explanation

Answer: Configuring key policies to control which IAM users and roles have permissions to use the KMS keys; Selecting which specific datasets, files, or database tables are selected for encryption

Answer

Under the AWS Shared Responsibility Model, the customer is responsible for configuring access permissions (key policies) to control usage of the encryption keys and selecting which specific resources (such as files, folders, or database tables) are encrypted. AWS is responsible for physical security of the data centers and the underlying multi-tenant infrastructure.
Configuring access permissions (key policies) and choosing which data components to encrypt are customer responsibilities because they belong to security 'in' the cloud. The customer maintains full ownership over data classification and key authorization rules.

Step-by-Step Solution

1
Analyze the service model of AWS KMS.
AWS KMS is a managed service where AWS manages the underlying hardware security modules (HSMs) and the multi-tenant virtualization layer, while the customer controls key usage and configuration.
This helps separate customer configuration tasks from AWS infrastructure management tasks.
2
Differentiate between customer responsibilities (security 'in' the cloud) and AWS responsibilities (security 'of' the cloud).
Customer tasks include configuring key policies and choosing what data to encrypt. AWS tasks include physical data center security, hardware maintenance, and media disposal.
Applying the Shared Responsibility Model allows identification of correct actions belonging to each party.

Key Concept

Under the AWS Shared Responsibility Model, the customer is responsible for data classification, choosing what to encrypt, and configuring key policies to manage access. AWS handles the physical security of the facilities, media sanitization, and underlying multi-tenant HSM infrastructure.
Estimated Time:1m 30s
Question 1093Question →

A multinational corporation is planning a highly publicized product launch in three months and expects a massive surge in traffic. They require proactive operational reviews, architectural design consulting, and the fastest possible response time for business-critical system outages. Crucially, they require a dedicated Technical Account Manager (TAM) to coordinate their support experience. Which TWO of the following statements correctly describe the SLA response times or features provided under the minimum AWS Support plan that meets these business requirements?

Select all that apply

Show answer & explanation

Answer: A response time of less than 15 minutes is guaranteed for business-critical system down cases.; A designated Technical Account Manager (TAM) is assigned to coordinate proactive operations and planning.

Answer

The minimum support plan that meets all requirements is the Enterprise Support plan, which guarantees a response time of less than 15 minutes for business-critical system down cases and provides a designated Technical Account Manager (TAM).
The minimum support plan that offers a dedicated/designated Technical Account Manager is the Enterprise Support plan. Enterprise Support guarantees a response time of under 15 minutes for business-critical issues and includes proactive planning and coordination from a dedicated TAM.

Step-by-Step Solution

1
Determine the support plan that provides a dedicated Technical Account Manager.
Enterprise Support is the only plan that provides a dedicated/designated TAM; Enterprise On-Ramp provides access to a shared pool of TAMs, and Business/Developer plans do not provide TAM access.
The scenario explicitly requires a dedicated TAM, ruling out all plans below the Enterprise Support plan.
2
Analyze the SLA response times for the selected Enterprise Support plan.
The Enterprise Support plan provides a response time of less than 15 minutes for business-critical system down cases.
This matches the fastest SLA tier offered by AWS, which is required for Enterprise Support.
3
Evaluate the inclusion of Infrastructure Event Management (IEM).
IEM is fully included in the Enterprise Support plan at no extra charge.
The customer is planning a major product launch, and IEM is included in their plan rather than requiring an additional fee.

Key Concept

AWS Support plan features and SLAs, specifically distinguishing the dedicated resource and faster SLA response times of the Enterprise Support plan from Enterprise On-Ramp and lower tiers.
Question 1094Question →

A startup is deploying a web application on Amazon EC2. The application requires a persistent block storage volume to host its relational database, where data must persist even if the EC2 instance is stopped. Additionally, the application requires a highly scalable and durable object storage solution to store and serve user-uploaded profile photos. Which two AWS storage services should the startup choose to meet these requirements? (Select TWO.)

Select all that apply

Show answer & explanation

Answer: Amazon Elastic Block Store (Amazon EBS); Amazon Simple Storage Service (Amazon S3)

Answer

Amazon Elastic Block Store (Amazon EBS) and Amazon Simple Storage Service (Amazon S3)
The correct choices are Amazon Elastic Block Store (Amazon EBS) and Amazon Simple Storage Service (Amazon S3). Amazon EBS provides persistent block-level storage volumes for Amazon EC2 instances, which is ideal for database storage where data must survive instance stops. Amazon S3 provides highly durable and scalable object storage, which is the industry standard for storing user-uploaded media files like profile photos.

Step-by-Step Solution

1
Identify the storage requirement for the database.
The database requires persistent block storage attached to an EC2 instance that survives instance stops.
Amazon Elastic Block Store (Amazon EBS) is the standard service for persistent block storage for Amazon EC2.
2
Identify the storage requirement for user-uploaded photos.
Profile photos are unstructured files (objects) that require durable, scalable storage accessible via web URLs.
Amazon Simple Storage Service (Amazon S3) is the primary object storage service in AWS, offering high scalability and durability for web assets.

Key Concept

Understanding the difference between block storage (EBS) and object storage (S3) for specific application workloads.
Question 1095Question →

VividArchive is migrating its video digitization and rendering platform to AWS. The platform has two primary workloads:

1. A continuous, predictable digitization process that runs 24/7 to archive historical tapes.
2. Sudden, unpredictable requests from news agencies for high-definition rendering, which requires massive compute capacity for brief periods.

Which two strategies will help the company minimize its Total Cost of Ownership (TCO) by aligning AWS billing models with these workload characteristics? (Select TWO.)

Select all that apply

Show answer & explanation

Answer: Deploying the digitization workload on Amazon EC2 instances covered by a Savings Plan to benefit from commitment-based discounts; Scaling the rendering capacity dynamically using Amazon EC2 Auto Scaling and On-Demand instances to match peak demands

Answer

Deploying the digitization workload on Amazon EC2 instances covered by a Savings Plan, and scaling the rendering capacity dynamically using Amazon EC2 Auto Scaling and On-Demand instances.
The correct strategies leverage the core cloud economics principles of elasticity and commitment-based pricing. The baseline, predictable tape digitization workload runs continuously, which makes it a perfect candidate for Savings Plans or Reserved Instances to lower the cost per hour. Conversely, the unpredictable spikes in video rendering demands are best handled through dynamic scaling using On-Demand instances, ensuring the company only pays for compute resources when they are actively processing requests.

Step-by-Step Solution

1
Analyze the resource consumption pattern of the tape digitization process.
Identified as a continuous, baseline workload that runs 24/7 with high predictability.
Baseline workloads are best optimized using commitment-based pricing models like Savings Plans or Reserved Instances to lower the hourly rate.
2
Analyze the resource consumption pattern of the video rendering process.
Identified as a highly spikey, unpredictable, and short-duration workload.
Spikey workloads should utilize elasticity through Auto Scaling and On-Demand instances to scale down when not in use, avoiding paying for idle resources.

Key Concept

Matching pricing models and elasticity to workload predictability
Estimated Time:1m 30s
Question 1096Question →

An enterprise is migrating a legacy document management system to AWS. The application runs on Amazon EC2 instances distributed across three Availability Zones. The instances require concurrent read and write access to a shared directory that supports standard file system operations (POSIX compliance). A large portion of the files consists of compliance reports that are rarely accessed after 30 days but must remain online and accessible with low latency when requested. Which AWS storage solution meets these requirements with the lowest operational overhead?

Show answer & explanation

Answer: Amazon Elastic File System (Amazon EFS) with an EFS Lifecycle Management policy configured to transition files to EFS Infrequent Access (IA) after 30 days of inactivity.

Answer

Amazon Elastic File System (Amazon EFS) with an EFS Lifecycle Management policy configured to transition files to EFS Infrequent Access (IA) after 30 days of inactivity.
Amazon Elastic File System (Amazon EFS) is a serverless, fully managed network file system that supports POSIX compliance, allowing multiple Amazon EC2 instances across multiple Availability Zones to concurrently read and write to the same directory. Furthermore, EFS Lifecycle Management automatically transitions files that have not been accessed for 30 days to the EFS Infrequent Access (IA) storage class, reducing storage costs by up to 92% while keeping the files online and immediately accessible with low latency.

Step-by-Step Solution

1
Analyze the application requirements.
The application requires shared read/write access from EC2 instances across multiple Availability Zones, native POSIX file system compliance, and cost-efficient lifecycle management that keeps files online with low-latency access.
This establishes the constraints needed to evaluate and eliminate unsuitable storage types.
2
Evaluate the storage candidates against POSIX and multi-AZ sharing requirements.
Amazon S3 is object storage (non-POSIX and lacks concurrent write locking). Amazon EBS Multi-Attach is restricted to a single Availability Zone. Amazon EFS is serverless, POSIX-compliant, and natively supports concurrent mounts across multiple Availability Zones.
This identifies Amazon EFS as the correct storage service type for the shared directory.
3
Evaluate the archival and access requirements.
EFS Lifecycle Management transitions inactive files to EFS IA, which reduces costs while maintaining immediate, online low-latency access, satisfying the operational requirements.
This verifies that transitioning to EFS IA keeps files online, unlike S3 Glacier classes which introduce retrieval delays.

Key Concept

Selecting the appropriate AWS storage service (block, file, or object) based on access patterns, multi-AZ support, POSIX compliance, and lifecycle cost optimization.
Question 1097Question →

A small business owner wants to quickly deploy a simple, low-traffic WordPress blog. The owner has limited cloud expertise and prefers a simplified service with a predictable monthly pricing plan that bundles compute, storage, and networking resources together. Which AWS service is best suited for this requirement?

Show answer & explanation

Answer: Amazon Lightsail

Answer

Amazon Lightsail
The correct answer is Amazon Lightsail because it is specifically designed to provide an easy-to-use virtual private server (VPS) experience. It bundles compute capacity, storage, and networking transfer limits into a single, predictable monthly price, which is ideal for users with limited cloud experience hosting simple websites like WordPress.

Step-by-Step Solution

1
Identify the key workload characteristics and user constraints from the scenario.
The user needs to host a simple WordPress blog, has limited cloud experience, and requires predictable monthly pricing with bundled resources (compute, storage, and networking).
This establishes the criteria needed to select the most appropriate AWS compute service.
2
Evaluate the available AWS compute services against the identified criteria.
Amazon Lightsail offers pre-configured virtual private servers with predictable monthly pricing that bundles all necessary resources. Amazon EC2, AWS Lambda, and AWS Fargate do not meet these criteria due to their administrative overhead, pay-per-execution model, or container orchestration complexity.
Comparing the options ensures the selected service matches the requirement for a simplified, low-cost VPS setup.

Key Concept

AWS Compute Service Selection for Simple Workloads
Question 1098Question →

An e-commerce company is migrating its monolithic application to a microservices architecture. They want to separate their temporary shopping cart session data from their primary transactional customer database to ensure loose coupling. The new shopping cart service requires a database that automatically scales horizontally to support millions of active users with predictable, single-digit millisecond latency for simple key-value lookups. Which AWS database service is best suited for this shopping cart service?

Show answer & explanation

Answer: Amazon DynamoDB

Answer

Amazon DynamoDB is the best choice because it is a managed NoSQL database designed for single-digit millisecond latency and seamless horizontal scaling, which aligns perfectly with key-value session data in a decoupled microservices architecture.
Amazon DynamoDB is a fully managed NoSQL database service that provides fast and predictable performance with seamless scalability. For a shopping cart microservice requiring single-digit millisecond response times and automatic horizontal scaling to handle traffic spikes, DynamoDB's key-value data model is the ideal choice. It allows the microservices architecture to remain loosely coupled by offloading session state from the primary transactional relational database.

Step-by-Step Solution

1
Analyze the application requirements.
The workload requires storing temporary key-value data (shopping cart sessions) with single-digit millisecond latency and automatic horizontal scaling to handle promotional spikes.
Understanding the data structure and access patterns helps narrow down the database categories (relational vs. NoSQL).
2
Evaluate the architectural constraints.
The architecture must support loose coupling by separating the session microservice's database from the main transactional database.
Selecting a dedicated, purpose-built database service for the microservice prevents monolithic dependency bottlenecks.
3
Compare AWS database services.
Amazon DynamoDB is a fully managed NoSQL key-value database designed for single-digit millisecond latency and seamless horizontal scaling, matching all criteria.
Aligning the workload requirements with the capabilities of each AWS database service yields the optimal solution.

Key Concept

Matching database workloads (NoSQL key-value vs relational) to AWS database services based on scaling and latency requirements.
Question 1099Question →

A startup needs to run two distinct workloads on Amazon EC2: a primary application database that must run continuously 24/7 with a predictable, steady-state baseline, and a data-cleansing batch process that is fault-tolerant and can be run at any time. Which two AWS pricing models should the company select to minimize costs for these workloads?

Select all that apply

Show answer & explanation

Answer: Amazon EC2 Reserved Instances; Amazon EC2 Spot Instances

Answer

Amazon EC2 Reserved Instances and Amazon EC2 Spot Instances are the most cost-effective choices for the continuous 24/7 database and the fault-tolerant batch process, respectively.
Reserved Instances and Spot Instances are the optimal combination. Reserved Instances provide substantial savings for the continuous, predictable database workload through a commitment discount, while Spot Instances offer the deepest discount for the flexible, fault-tolerant batch processing workload.

Step-by-Step Solution

1
Analyze the requirements of the database workload.
The database workload is steady-state, predictable, and runs continuously 24/7.
Steady-state continuous workloads benefit most from commitment-based discounts like Reserved Instances or Savings Plans.
2
Analyze the requirements of the data-cleansing batch process workload.
The batch process is fault-tolerant and can run at any time.
Workloads that can tolerate interruption and have flexible start times are the primary use case for Spot Instances to achieve maximum cost savings.

Key Concept

AWS Pricing Models
Question 1100Question →

A retail company is migrating a legacy database application to an Amazon EC2 instance. The database requires low-latency block storage that persists independently of the lifecycle of the EC2 instance, can be detached and reattached to a different instance in the same Availability Zone, and supports point-in-time backups. Which AWS storage service should the company select to meet these requirements?

Show answer & explanation

Answer: Amazon Elastic Block Store (Amazon EBS)

Answer

Amazon Elastic Block Store (Amazon EBS)
Amazon Elastic Block Store (Amazon EBS) is the correct choice because it offers persistent block storage volumes designed specifically for Amazon EC2. EBS volumes exist independently of the EC2 instance lifecycle, allowing them to be detached and reattached to other instances in the same Availability Zone. They also support point-in-time snapshots stored in Amazon S3.

Step-by-Step Solution

1
Analyze the application requirements.
The database application requires low-latency block-level storage that is persistent, can survive EC2 instance stops/terminations, can be reattached within the same Availability Zone, and supports snapshots.
Identifying these key storage characteristics helps filter out object, file, and temporary storage options.
2
Compare the requirements against AWS storage services.
Amazon EBS is the only service that provides persistent, attachable block storage supporting snapshots within an Availability Zone. Amazon S3 is object storage, Amazon EFS is file storage, and Instance Store is ephemeral.
Selecting the correct storage type ensures performance, durability, and operational compatibility with the legacy database design.

Key Concept

Differentiating block, file, and object storage services in AWS, and understanding their persistence characteristics.
Estimated Time:1m 0s
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