ACloud Guru Certified Cloud Practitioner Practice Exam

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What is essential when architecting applications for high availability in AWS?

Using a single availability zone
Implementing Multi-AZ deployments
Deploying only on EC2
Using CloudTrail for monitoring

The correct answer is: Implementing Multi-AZ deployments

Implementing Multi-AZ (Availability Zone) deployments is essential when architecting applications for high availability in AWS. Multi-AZ deployments help ensure that if one availability zone experiences a failure, the application can continue to operate seamlessly by failing over to another availability zone. This redundancy across different physical locations helps minimize downtime and provides continuous availability of services. When applications are designed to span multiple availability zones, resources can be distributed to reduce the risk of a single point of failure. This architecture allows for automatic failover and enhances the resilience of applications, making it a crucial consideration for any application that demands high availability. Using a single availability zone would create a single point of failure, meaning if that zone goes down, the application becomes unavailable. Deploying only on EC2 does not inherently guarantee high availability, as it does not address the need for redundancy across different zones. Lastly, while CloudTrail is an essential service for monitoring and logging user activity within AWS, it does not specifically address the architectural considerations required for ensuring the high availability of applications.