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| Section | Weight | Objectives |
|---|---|---|
| Design Secure Architectures | 30% | - Design secure access to AWS resources
|
| Design Resilient Architectures | 26% | - Design for reliability and recovery
|
| Design High-Performing Architectures | 24% | - Design high-performance compute solutions
|
| Design Cost-Optimized Architectures | 20% | - Identify cost-effective storage solutions
|
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NEW QUESTION # 537
An image-processing company has a web application that users use to upload images. The application uploads the images into an Amazon S3 bucket. The company has set up S3 event notifications to publish the object creation events to an Amazon SQS standard queue. The SQS queue serves as the event source for an AWS Lambda function that processes the images and sends the results to users through email.
Users report that they are receiving multiple email messages for every uploaded image. A solutions architect determines that SQS messages are invoking the Lambda function more than once, resulting in multiple email messages.
What should the solutions architect do to resolve this issue with the LEAST operational overhead?
Answer: C
Explanation:
The issue is most likely that messages become visible in the queue again before Lambda finishes processing them. AWS documents that when Lambda polls SQS, messages remain hidden only for the queue's visibility timeout, and if they are not deleted before that timeout expires, they can be retrieved again and reprocessed. AWS specifically recommends setting the SQS visibility timeout to at least six times the Lambda function timeout, and if a batch window is used, to add that value as well. Long polling reduces empty receives but does not prevent duplicate processing. Changing to FIFO is unnecessary here, and deleting messages before successful processing risks data loss.
NEW QUESTION # 538
A company is redesigning a static website. The company needs a solution to host the new website in the company's AWS account. The solution must be secure and scalable. Which combination of solutions will meet these requirements? (Select THREE.)
Answer: B,D,F
NEW QUESTION # 539
A company runs a production application on a fleet of Amazon EC2 instances. The application reads the data from an Amazon SQS queue and processes the messages in parallel. The message volume is unpredictable and often has intermittent traffic. This application should continually process messages without any downtime.
Which solution meets these requirements MOST cost-effectively?
Answer: A
Explanation:
We recommend that you use On-Demand Instances for applications with short-term, irregular workloads that cannot be interrupted.
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-on-demand-instances.html
NEW QUESTION # 540
A healthcare company is developing an AWS Lambda function that publishes notifications to an encrypted Amazon Simple Notification Service (Amazon SNS) topic. The notifications contain protected health information (PHI). The SNS topic uses AWS Key Management Service (AWS KMS) customer-managed keys for encryption. The company must ensure that the application has the necessary permissions to publish messages securely to the SNS topic. Which combination of steps will meet these requirements? (Select THREE.)
Answer: A,B,C
Explanation:
To securely publish messages to an encrypted Amazon SNS topic, the following steps are required:
A). Resource policy for SNS topic:Ensures that the Lambda function is explicitly allowed to publish messages to the topic.
C). Resource policy for KMS key:Provides the necessary permissions to use the customer- managed key for encryption.
F). Lambda execution role:Grants the Lambda function the necessary IAM permissions to use the encryption key.
Other options:
Bis invalid because using SSE-KMS does not eliminate the need for resource policies. Doverlaps with A, but specifying the ARN in the topic policy is covered by creating the resource policy.
Eis unrelated as API Gateway is not required for this setup.
NEW QUESTION # 541
An application consists of multiple EC2 instances in private subnets in different availability zones.
The application uses a single NAT Gateway for downloading software patches from the Internet to the instances. There is a requirement to protect the application from a single point of failure when the NAT Gateway encounters a failure or if its availability zone goes down.
How should the Solutions Architect redesign the architecture to be more highly available and cost- effective
Answer: A
Explanation:
A NAT Gateway is a highly available, managed Network Address Translation (NAT) service for your resources in a private subnet to access the Internet. NAT gateway is created in a specific Availability Zone and implemented with redundancy in that zone.
You must create a NAT gateway on a public subnet to enable instances in a private subnet to connect to the Internet or other AWS services, but prevent the Internet from initiating a connection with those instances.
If you have resources in multiple Availability Zones and they share one NAT gateway, and if the NAT gateway's Availability Zone is down, resources in the other Availability Zones lose Internet access. To create an Availability Zone-independent architecture, create a NAT gateway in each Availability Zone and configure your routing to ensure that resources use the NAT gateway in the same Availability Zone.
Hence, the correct answer is: Create a NAT Gateway in each availability zone. Configure the route table in each private subnet to ensure that instances use the NAT Gateway in the same availability zone. The option that says: Create a NAT Gateway in each availability zone. Configure the route table in each public subnet to ensure that instances use the NAT Gateway in the same availability zone is incorrect because you should configure the route table in the private subnet and not the public subnet to associate the right instances in the private subnet.
The options that say: Create two NAT Gateways in each availability zone. Configure the route table in each public subnet to ensure that instances use the NAT Gateway in the same availability zone and Create three NAT Gateways in each availability zone. Configure the route table in each private subnet to ensure that instances use the NAT Gateway in the same availability zone are both incorrect because a single NAT Gateway in each availability zone is enough. NAT Gateway is already redundant in nature, meaning, AWS already handles any failures that occur in your NAT Gateway in an availability zone.
References:
https://docs.aws.amazon.com/vpc/latest/userguide/vpc-nat-gateway.html
https://docs.aws.amazon.com/vpc/latest/userguide/vpc-nat-comparison.html Check out this Amazon VPC Cheat Sheet:
https://tutorialsdojo.com/amazon-vpc/
NEW QUESTION # 542
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