Resilient Cloud Solutions

A company runs a critical web application on EC2 instances behind an Application Load Balancer (ALB) with Auto Scaling. During a recent traffic spike, the application became unavailable for 10 minutes. Analysis shows that the ALB's healthy host count dropped to zero because the instances failed health checks due to high CPU load. What is the MOST effective design change to improve resilience during future traffic spikes?

A company runs a stateful web application on EC2 instances behind a Network Load Balancer (NLB) in a single Availability Zone. The application stores session state locally on the instance. The company wants to achieve high availability across multiple AZs with minimal application changes. What should the DevOps engineer do?

A company's DevOps team is designing a disaster recovery plan for a critical application. The application runs on EC2 instances with an RDS MySQL database. The Recovery Time Objective (RTO) is 15 minutes, and the Recovery Point Objective (RPO) is 1 hour. Which approach BEST meets these requirements?

A company's application uses Amazon SQS to decouple microservices. During peak hours, the SQS queue backlog grows significantly, causing processing delays. The DevOps team wants to reduce latency without increasing costs unnecessarily. What should the team do?

A company wants to design a highly available web application using AWS services. The application must be resilient to the failure of an entire AWS Region. Which THREE components should the architecture include? (Choose THREE.)

A company runs a critical e-commerce platform on AWS. The architecture includes an Application Load Balancer (ALB) that distributes traffic to a fleet of EC2 instances in an Auto Scaling group across three Availability Zones. The instances run a Java application that connects to an Amazon RDS Multi-AZ MySQL database. The application also uses Amazon ElastiCache for Redis for session caching. The company recently experienced a severe outage where the ALB's 5xx error rate spiked to 100% for 45 minutes. The root cause was a combination of a slow-running query on the RDS primary instance and a subsequent failover that caused the application to lose connections to the database. The failover happened because the slow query caused the primary to become unresponsive, triggering a Multi-AZ failover. During the failover, the application's connection pool exhausted, and new connections failed. The application logs show a high rate of 'java.sql.SQLTimeoutException' and 'com.mysql.cj.exceptions.CJCommunicationsException'. The DevOps team needs to implement a long-term solution that minimizes the impact of similar incidents. The solution must be cost-effective and require minimal application changes. Which combination of actions should the DevOps team take?

A company runs a containerized microservices application on Amazon EKS. The application includes a critical service that processes real-time financial transactions. This service must be highly available and resilient to node failures. The current setup uses a Deployment with 3 replicas and a ClusterIP service. During a recent node failure, the application experienced a brief period of unavailability. Which action should the DevOps engineer take to improve resilience without changing the underlying infrastructure?

A company is building a multi-tier web application on AWS. The application must be resilient to the failure of an entire Availability Zone. The architecture includes an Application Load Balancer (ALB), EC2 instances in an Auto Scaling group, and an Amazon RDS for MySQL database. Which TWO actions should be taken to achieve this resilience? (Choose two.)

A company runs a critical web application on Amazon EC2 instances behind an Application Load Balancer (ALB) across multiple Availability Zones. The application stores session data in a shared Amazon ElastiCache for Redis cluster. The operations team reports that during a recent AZ failure, users experienced session loss and application errors. Which combination of actions should the company take to improve resilience and maintain session state during an AZ failure? (Choose TWO.)

A company runs a stateless web application on EC2 instances in an Auto Scaling group across three Availability Zones. The application uses an Application Load Balancer. The operations team needs to ensure that the application remains available if one AZ fails. Which solution is MOST resilient?

A DevOps team is designing a disaster recovery plan for a production RDS for PostgreSQL database. The RPO must be less than 5 minutes and the RTO less than 1 hour. The database size is 2 TB. Which solution is MOST cost-effective?

A company runs a containerized microservices architecture on Amazon ECS with Fargate. The services communicate via an internal Application Load Balancer. Recently, a new deployment of Service A caused its health checks to fail. The DevOps engineer notices that the old tasks remain running and the service is unavailable. What configuration change would prevent this issue in future deployments?

A company uses AWS CloudFormation to deploy infrastructure. The stack creation fails with the error: 'Resource handler returned message: 'The security group does not exist in VPC'.' The template references a security group by name. What is the MOST likely cause?

A company wants to design a highly available and fault-tolerant architecture for a stateless web application on AWS. Which TWO actions should they take? (Choose two.)

A company is designing a disaster recovery plan for a critical application with an RPO of 15 minutes and RTO of 1 hour. The application runs on EC2 instances with an RDS MySQL database. The primary Region is us-east-1. Which THREE actions should they take to meet the RPO and RTO? (Choose three.)

A company deploys the above CloudFormation stack. They want to enforce HTTPS for all requests to the S3 bucket. After deployment, users are still able to make HTTP requests. What is the problem?

A company runs a critical web application on EC2 instances behind an Application Load Balancer (ALB) across multiple Availability Zones. During a recent failure of one AZ, the application experienced downtime because the Auto Scaling group did not launch new instances quickly enough. What should a DevOps engineer do to improve resilience?

A company runs a web application on EC2 instances behind an ALB. To improve resilience, they want to automatically re-register failed instances. Which solution meets this requirement?

A company uses Amazon RDS Multi-AZ for disaster recovery. The primary DB instance in us-east-1a fails. What happens next?

A company runs a critical web application on EC2 instances behind an Application Load Balancer. The application stores session state in an in-memory cache on each instance. During deployment of a new version, users experience session timeouts and errors. Which design change will MOST effectively improve resilience and avoid session loss during deployments?

A company is designing a multi-Region disaster recovery strategy for a stateless web application. The application runs on EC2 instances in an Auto Scaling group behind an ALB in us-east-1. The recovery point objective (RPO) is 15 minutes and recovery time objective (RTO) is 30 minutes. The application data is stored in Amazon RDS for PostgreSQL. Which combination of actions should the company take to meet the RPO and RTO?

A DevOps engineer is designing a resilient architecture for a serverless application using AWS Lambda, Amazon API Gateway, and Amazon DynamoDB. The application experiences occasional spikes in traffic that cause Lambda function throttling and increased error rates. What is the MOST effective way to improve resilience and reduce throttling?

A company is deploying a stateful application on Amazon EKS. The application requires persistent storage that can be reattached to a new pod if the original pod fails. The cluster spans multiple Availability Zones. Which storage solution provides the BEST resilience and meets these requirements?

A company is deploying a serverless application using AWS Lambda, Amazon API Gateway, and Amazon DynamoDB. The application must be resilient to regional outages. Which THREE steps should the company take to achieve multi-Region resilience? (Choose THREE.)

A company runs a critical application on Amazon ECS with Fargate launch type. The application is deployed across multiple Availability Zones. The DevOps team needs to ensure that if an entire Availability Zone fails, the application continues to serve traffic without manual intervention. What should the team do?

A company uses AWS Lambda functions to process events from an Amazon SQS queue. The Lambda function occasionally fails due to a transient downstream service error. The DevOps team wants to ensure that failed messages are not lost and can be retried later. The team also wants to reduce the number of invocations on the downstream service. Which configuration should the team use?

A company is building a serverless application using AWS Lambda, Amazon API Gateway, and Amazon DynamoDB. The application is expected to have unpredictable traffic patterns. The DevOps team needs to ensure that the application can handle sudden spikes in traffic without throttling. Which TWO actions should the team take? (Choose TWO.)

A company runs a stateful application on EC2 instances. The application stores session data locally. The instances are behind an ALB with sticky sessions enabled. A scaling event terminates an instance, causing loss of session data. How can the company prevent this while maintaining performance?

A company is deploying a critical application on Amazon EC2 instances behind an Application Load Balancer (ALB) across multiple Availability Zones. The application must be resilient to the failure of an entire Availability Zone. Which design should the company implement?

A DevOps team is designing a disaster recovery solution for an Amazon RDS for MySQL database. The primary database is in us-east-1, and the recovery point objective (RPO) is 5 minutes, recovery time objective (RTO) is 1 hour. Which solution meets these requirements?

A company runs a stateless web application on Amazon ECS with Fargate launch type. The application experiences intermittent traffic spikes. The company wants to ensure that the application can scale automatically and remain resilient to underlying infrastructure failures. Which combination of actions should the DevOps engineer take?

A company runs a web application on AWS that uses Amazon SQS to decouple the frontend from the backend processing. The application experiences sudden spikes in traffic, causing the SQS queue to accumulate a large number of messages. The backend workers are unable to process messages fast enough, leading to increased latency. What solution can the company implement to improve the resilience and scalability of the backend?

A company is implementing a disaster recovery strategy for its Amazon Aurora MySQL database. The primary database is in us-west-2. The company requires an RPO of less than 1 minute and an RTO of less than 5 minutes. Which solution meets these requirements?

A company is using AWS CloudFormation to deploy a critical application stack. The company wants to ensure that the stack can be recovered quickly in case of a failure. Which THREE strategies should the company implement? (Choose THREE.)

Refer to the exhibit. A DevOps engineer applies the IAM policy shown to an S3 bucket to enforce server-side encryption. However, users report that some uploads succeed without encryption. What is the most likely reason?

A company runs a stateless web application on EC2 instances behind an Application Load Balancer. To improve resilience, which configuration should be used for the EC2 instances?

A company wants to ensure that its application can recover from an Amazon S3 service disruption. The application reads and writes data to S3. Which strategy should the application implement to achieve resilience?

A company's application runs on Amazon ECS with Fargate launch type. The application must be resilient to an Availability Zone failure. Which configuration should be used?

A company is designing a disaster recovery plan for an application running on AWS. The plan must meet an RTO of 1 hour and an RPO of 15 minutes. Which TWO strategies can achieve these objectives? (Select TWO.)

A company runs a critical e-commerce application on Amazon EC2 instances behind an Application Load Balancer (ALB) with Auto Scaling. The application must be resilient to an Availability Zone (AZ) failure. What is the MOST resilient configuration?

A company uses AWS Lambda with Amazon DynamoDB to process orders. During peak hours, the Lambda function sometimes fails with throttling errors from DynamoDB. The system must be resilient and cost-effective. What should a DevOps engineer do?

A company is designing a resilient architecture for a web application that uses Amazon RDS for MySQL. The application must be able to withstand the loss of an entire AWS Region. Which TWO actions should the company take?

A company runs a critical application on Amazon ECS with the Fargate launch type. The application is deployed across three Availability Zones. Each service has its own Application Load Balancer. The company wants to implement a blue/green deployment strategy to reduce risk. They currently use AWS CodeDeploy for ECS deployments. During a recent deployment, the company noticed that the new version (green) was not receiving any traffic even after passing all health checks. The CodeDeploy configuration uses a 'Linear10PercentEvery3Minutes' traffic shifting configuration. What is the most likely reason that the green tasks are not receiving traffic?