- (Topic 4)
An ecommerce application uses a PostgreSQL database that runs on an Amazon EC2 instance. During a monthly sales event, database usage increases and causes database connection issues for the application. The traffic is unpredictable for subsequent monthly sales events, which impacts the sales forecast. The company needs to maintain performance when there is an unpredictable increase in traffic.
Which solution resolves this issue in the MOST cost-effective way?
Correct Answer:
A
Amazon Aurora Serverless v2 is a cost-effective solution that can automatically scale the database capacity up and down based on the application’s needs. It can handle unpredictable traffic spikes without requiring any provisioning or management of database instances. It is compatible with PostgreSQL and offers high performance, availability, and durability1. References: 1: AWS Ramp-Up Guide: Architect2, page 312: AWS Certified Solutions Architect - Associate exam guide3, page 9.
- (Topic 4)
A company has applications hosted on Amazon EC2 instances with IPv6 addresses. The applications must initiate communications with other external applications using the internet.
However, the company’s security policy states that any external service cannot initiate a connection to the EC2 instances.
What should a solutions architect recommend to resolve this issue?
Correct Answer:
D
An egress-only internet gateway is a VPC component that allows outbound communication over IPv6 from instances in your VPC to the internet, and prevents the internet from initiating an IPv6 connection with your instances. This meets the company’s security policy and requirements. To use an egress-only internet gateway, you need to add a route in the subnet’s route table that routes IPv6 internet traffic (::/0) to the egress-only internet gateway.
Reference URLs:
1 https://docs.aws.amazon.com/vpc/latest/userguide/egress-only-internet-gateway.html
2 https://dev.to/aws-builders/what-is-an-egress-only-internet-gateways-in-aws-7gp
3 https://docs.aws.amazon.com/vpc/latest/userguide/route-table-options.html
- (Topic 3)
A company is running a critical business application on Amazon EC2 instances behind an Application Load Balancer The EC2 instances run in an Auto Scaling group and access an Amazon RDS DB instance
The design did not pass an operational review because the EC2 instances and the DB instance are all located in a single Availability Zone A solutions architect must update the design to use a second Availability Zone
Which solution will make the application highly available?
Correct Answer:
C
https://aws.amazon.com/vpc/faqs/#:~:text=Can a subnet span Availability,w ithin a single Availability Zone.
- (Topic 4)
A company containerized a Windows job that runs on .NET 6 Framework under a Windows container. The company wants to run this job in the AWS Cloud. The job runs every 10 minutes. The job's runtime varies between 1 minute and 3 minutes.
Which solution will meet these requirements MOST cost-effectively?
Correct Answer:
A
AWS Lambda supports container images as a packaging format for functions. You can use existing container development workflows to package and deploy Lambda functions as container images of up to 10 GB in size. You can also use familiar tools such as Docker CLI to build, test, and push your container images to Amazon Elastic Container Registry (Amazon ECR). You can then create an AWS Lambda function based on the container image of your job and configure Amazon EventBridge to invoke the function every 10 minutes using a cron expression. This solution will be cost-effective as you only pay for the compute time you consume when your function runs. References: https://docs.aws.amazon.com/lambda/latest/dg/images-create.html https://docs.aws.amazon.com/eventbridge/latest/userguide/run-lambda-schedule.html
- (Topic 4)
A company runs container applications by using Amazon Elastic Kubernetes Service (Amazon EKS) and the Kubernetes Horizontal Pod Autoscaler. The workload is not
consistent throughout the day. A solutions architect notices that the number of nodes does not automatically scale out when the existing nodes have reached maximum capacity in the cluster, which causes performance issues
Which solution will resolve this issue with the LEAST administrative overhead?
Correct Answer:
B
The Kubernetes Cluster Autoscaler is a component that automatically adjusts the number of nodes in your cluster when pods fail or are rescheduled onto other nodes. It uses Auto Scaling groups to scale up or down the nodes according to the demand and capacity of your cluster1.
By using the Kubernetes Cluster Autoscaler in your Amazon EKS cluster, you can achieve the following benefits:
✑ You can improve the performance and availability of your container applications by
ensuring that there are enough nodes to run your pods and that there are no idle nodes wasting resources.
✑ You can reduce the administrative overhead of managing your cluster size
manually or using custom scripts. The Cluster Autoscaler handles the scaling decisions and actions for you based on the metrics and events from your cluster.
✑ You can leverage the integration of Amazon EKS and AWS Auto Scaling to
optimize the cost and efficiency of your cluster. You can use features such as launch templates, mixed instances policies, and spot instances to customize your node configuration and save up to 90% on compute costs2
