Free Practice Questions for Amazon Web Services CLF-C02 Exam

AWS provides the flexibility to scale resources up or down on demand, enabling companies to test new applications without making long-term commitments. This principle allows for cost efficiency and agility during testing and development. The other options do not specifically highlight the benefits of flexible, on-demand resource scaling.

Spot Instances offer the lowest cost for Amazon EC2 and are suitable for non-production workloads like development and testing where occasional unavailability is acceptable. Spot Instances take advantage of unused EC2 capacity at a reduced cost, making them ideal for environments that can tolerate interruptions. Reserved or On-Demand Instances would be more expensive for this scenario, and Dedicated Hosts are not cost-effective for non-production environments.

SSH keys provide secure login for Linux-based Amazon EC2 instances by establishing a secure connection over SSH (Secure Shell), protecting login credentials from interception. VPNs and encryption enhance security in other contexts, but SSH keys are the standard approach for accessing Linux EC2 instances. Amazon Route 53 is unrelated to EC2 instance access.

AWS Budgets allows organizations to set custom cost and usage budgets and receive notifications when they exceed predefined thresholds. This feature helps the finance department monitor spending and manage budget forecasts effectively. AWS Cost and Usage Reports and Cost Explorer provide detailed billing data but do not include budget notifications. Consolidated billing in AWS Organizations is useful for aggregating billing across accounts but does not provide budget alerts.

Enforcing multi-factor authentication (MFA) for privileged users enhances account security by requiring a second form of authentication. It reduces the risk of unauthorized access, even if credentials are compromised. Removing the root account is not possible, and creating access keys for the root account or privileged users can increase security risks rather than reduce them.

Using multiple Availability Zones within the same AWS Region meets the requirements for having instances in different locations with independent power and networking. Availability Zones are distinct physical locations within a region, each with separate power sources and networking. Edge locations are used for content delivery, and Amazon Connect and AWS Artifact locations are not relevant to EC2 deployment and infrastructure.

Rightsizing involves adjusting instance types based on actual utilization to optimize costs and performance. Changing the size and type of EC2 instances according to utilization data achieves this with minimal operational overhead. Adding instances or changing payment methods does not directly address instance resizing, and reprovisioning with larger instances may not be optimal based on actual usage.

Reducing Costs with AWS Cloud:

Capacity Adjustment (B):

Elasticity: AWS allows you to scale your resources up or down based on demand, which means you only pay for what you use. This reduces the cost of over-provisioning resources.

Auto Scaling: Automatically adjusts compute capacity based on usage, ensuring cost efficiency.

Eliminating On-Premises Costs (E):

No Infrastructure Maintenance: By using AWS, businesses do not need to invest in physical infrastructure or handle maintenance, reducing both capital and operational expenditures.

Managed Services: AWS offers managed services that reduce the need for in-house technical staff to manage and maintain infrastructure.

AWS Cloud Economics Center

AWS Benefits

AWS Software Development Kit (SDK) is a set of platform-specific tools for developers that let them integrate AWS service features directly into their applications. AWS SDKs provide libraries, code samples, documentation, and other resources to help developers write code that interacts with AWS APIs. AWS SDKs support various programming languages, such as Java, Python, Ruby, .NET, Node.js, Go, and more. AWS SDKs make it easier for developers to access AWS services, such as Amazon S3, Amazon EC2, Amazon DynamoDB, AWS Lambda, and more, from their applications. AWS SDKs also handle tasks such as authentication, error handling, retries, and data serialization, so developers can focus on their application logic.

Loose coupling is a design principle that involves reducing dependencies between application components so that they can operate independently. This approach ensures that the failure of one component does not affect the availability of the others, thereby improving the application's fault tolerance and resilience. Disposable resources, automation, and rightsizing are valuable principles in cloud architecture, but they do not directly address the requirement of remaining available despite the failure of an individual component like loose coupling does.

Amazon Aurora (with PostgreSQL compatibility) and Amazon EC2 can both host PostgreSQL databases. Aurora is a managed database service that provides a fully compatible PostgreSQL environment with automated management. EC2 can also host PostgreSQL, but it requires more manual setup and maintenance. Amazon S3 and EFS do not host databases, and Amazon OpenSearch Service is intended for search and analytics, not relational databases.

Under the AWS Shared Responsibility Model, AWS manages the securityofthe cloud, while customers manage securityinthe cloud. For EC2 instances, it is the customer’s responsibility to manage the guestoperating system, including patching and encrypting data stored on attached storage volumes. AWS is responsible for the underlying infrastructure, including physical security and hypervisor maintenance.

AWS Outposts is an AWS offering that brings AWS infrastructure and services to a customer's on-premises location. It allows companies to run AWS services locally while meeting any regulatory or compliance requirements to keep data or applications on-premises. Dedicated Instances are EC2 instances that run on hardware dedicated to a single customer but are still within AWS data centers. Amazon CloudFront is a CDN service, and AWS Fargate is a serverless compute engine for containers, neither of which meets the requirement for running an application on-premises.