AWS Certified Cloud Practitioner Practice Questions: Technology Domain

Correct Answer: B

Explanation: Reserved Instances offer a significant discount compared to On-Demand pricing and are suitable for applications with steady-state or predictable usage, ensuring cost efficiency while maintaining availability. Spot Instances provide the lowest cost but may be interrupted, which could compromise availability. Savings Plans offer flexibility across instance types but are more about financial commitment across AWS services rather than specific instance availability. On-Demand Instances are most flexible but are the most expensive option.

Correct Answer: C

Explanation: On-Demand Instances allow you to pay for compute capacity by the hour or second, with no long-term commitments. This model lets you pay only for the compute capacity you actually use.

Correct Answer: A

Explanation: AWS Database Migration Service (DMS) is specifically designed to migrate databases to AWS with minimal downtime by allowing data to be continuously replicated from the source database to the target database during the migration process. Amazon RDS Read Replicas are used for read scaling, not migration. Amazon Aurora Global Database is used for cross-region replication, and AWS Snowball is a data transfer device for large-scale data transfer, not specifically for database migration.

Correct Answer: A

Explanation: Option A is correct because Amazon Route 53 provides DNS routing to multiple regions, AWS Global Accelerator improves global application availability and performance, Amazon EC2 Auto Scaling ensures the application can scale based on demand, and Elastic Load Balancing distributes traffic across instances. Option B is incorrect because AWS Lambda is not necessary for hosting a web application that requires EC2 instances, and Amazon S3 is not suitable for hosting dynamic web applications. Option C is incorrect because AWS Elastic Beanstalk and CloudFront do not inherently provide multi-region high availability and latency optimization. Option D is incorrect because AWS Direct Connect is not needed for this scenario, and VPC alone does not provide high availability across regions.

Correct Answer: A

Explanation: Amazon ElastiCache is a web service that makes it easy to deploy, operate, and scale an in-memory cache in the cloud, improving the performance of web applications by retrieving data from a fast, managed in-memory cache instead of relying on slower disk-based databases. Amazon RDS is a relational database service, not a caching service. AWS Storage Gateway is for hybrid cloud storage, not caching. Amazon S3 is an object storage service and does not provide caching capabilities.

Correct Answer: B

Explanation: Amazon ECS (Elastic Container Service) is a fully managed container orchestration service that makes it easy to deploy, manage, and scale containerized applications using Docker. AWS Elastic Beanstalk is more suited for deploying and managing applications without focusing on infrastructure, but it's not specifically designed for managing containers. AWS Lambda is a serverless compute service that lets you run code without provisioning or managing servers, and it's not used for container orchestration. Amazon RDS is a managed database service and is not related to container management.

Correct Answer: A

Explanation: Amazon SNS (Simple Notification Service) is designed for sending notifications and messages in real-time to a large number of subscribers. It supports push notifications to mobile devices, making it ideal for real-time messaging in mobile applications. Amazon SQS is a message queue service for decoupling application components, not real-time notifications. AWS Step Functions is used for orchestrating workflows, not direct messaging. AWS AppSync is used for building GraphQL APIs and does not directly handle notifications.

Correct Answer: B

Explanation: AWS Lambda Provisioned Concurrency keeps functions initialized and ready to respond in double-digit milliseconds, which is ideal for reducing cold start latency. Increasing memory (Option A) might improve execution speed but won't reduce cold start times. Option C is not applicable as Lambda does not use instance types. Option D is for orchestrating workflows, not reducing latency.

Correct Answer: C

Explanation: Amazon EC2 (Elastic Compute Cloud) provides scalable computing capacity in the AWS cloud. It allows users to launch virtual servers, known as instances, on demand.

Correct Answer: A

Explanation: AWS Lambda with Amazon API Gateway provides a serverless architecture that automatically scales to handle any level of traffic, making it highly cost-effective for unpredictable workloads. You only pay for the compute time you consume. Option B, Amazon EC2 Auto Scaling with Elastic Load Balancing, provides scalability but involves managing EC2 instances and is generally more costly for sporadic workloads. Option C, Amazon RDS with Multi-AZ deployments, is for database high availability and does not address serverless or unpredictable traffic. Option D, Amazon Lightsail, offers fixed pricing but is not serverless and may not scale effectively for traffic spikes.