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| Section | Weight | Objectives |
|---|---|---|
| Design Cost-Optimized Architectures | 20% | - Cost-effective resource selection
|
| Design Resilient Architectures | 26% | - Fault tolerance and recovery
|
| Design High-Performing Architectures | 24% | - Performance scaling
|
| Design Secure Architectures | 30% | - Secure workloads and applications
|
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질문 # 489
A company has 15 employees. The company stores employee start dates in an Amazon DynamoDB table. The company wants to send an email message to each employee on the day of the employee's work anniversary. Which solution will meet these requirements with the MOST operational efficiency?
정답：B
설명：
AWS Lambda for Operational Efficiency:
AWS Lambdais a serverless compute service that allows you to run code without provisioning or managing servers. It automatically scales based on the number of invocations and eliminates the need to maintain and monitor EC2 instances, making it far more operationally efficient compared to running a cron job on EC2.
By using Lambda, you pay only for the compute time that your function uses. This is especially beneficial when dealing with lightweight tasks, such as scanning a DynamoDB table and sending email messages once a day.
Amazon DynamoDB:
DynamoDBis a highly scalable, fully managed NoSQL database. The table stores employee start dates, and scanning the table to find the employees who have a work anniversary on the current day is a lightweight operation. Lambda can easily perform this operation using theDynamoDB Scan APIor queries, depending on how the data is structured.
Amazon SNS for Email Notifications:
Amazon Simple Notification Service (SNS)is a fully managed messaging service that supports sending notifications to a variety of endpoints, including email. SNS is well-suited for sendingout email messages to employees, as it can handle the fan-out messaging pattern (sending the same message to multiple recipients).
In this scenario, once Lambda identifies employees who have their work anniversaries, it can use SNS to send the email notifications efficiently. SNS integrates seamlessly with Lambda, and sending emails via SNS is a common pattern for this type of use case.
Event Scheduling:
To automate this daily task, you can schedule the Lambda function usingAmazon EventBridge (formerly CloudWatch Events). EventBridge can trigger the Lambda function on a daily schedule (cron-like scheduling). This avoids the complexity and operational overhead of manually setting up cron jobs on EC2 instances.
Why Not EC2 or SQS?
Option A & B suggest running a cron job on anAmazon EC2instance. This approach requires you to manage, scale, and patch the EC2 instance, which increases operational overhead. Lambda is a better choice because it automatically scales and doesn't require server management. Amazon Simple Queue Service (SQS) is ideal for decoupling distributed systems but isn't necessary in this context because the goal is to send notifications to employees on their work anniversaries.
SQS adds unnecessary complexity for this straightforward use case, where SNS is the simpler and more efficient solution.
질문 # 490
Which solution will meet these requirements?
정답：A
설명：
Amazon Aurora PostgreSQL with Babelfish allows SQL Server applications to run directly on Aurora PostgreSQL with minimal code changes. Babelfish adds a SQL Server-compatible endpoint, significantly lowering costs compared to running licensed SQL Server instances on RDS or EC2.
AWS Documentation Extract:
"Babelfish for Aurora PostgreSQL enables Aurora to understand T-SQL and SQL Server wire protocol, allowing you to run SQL Server applications on Amazon Aurora PostgreSQL with lower costs." (Source: Babelfish for Aurora PostgreSQL documentation)
* A, D: SQL Server on EC2 or RDS incurs high Microsoft licensing costs.
* C: Plain PostgreSQL would require more code refactoring than Babelfish.
Reference: AWS Certified Solutions Architect - Official Study Guide, Babelfish and Cost Optimization.
질문 # 491
An operations team has an application running on EC2 instances inside two custom VPCs. The VPCs are located in the Ohio and N.Virginia Region respectively. The team wants to transfer data between the instances without traversing the public internet.
Which combination of steps will achieve this? (Select TWO.)
정답：B,D
설명：
A VPC peering connection is a networking connection between two VPCs that enables you to route traffic between them using private IPv4 addresses or IPv6 addresses. Instances in either VPC can communicate with each other as if they are within the same network. You can create a VPC peering connection between your own VPCs, or with a VPC in another AWS account. The VPCs can be in different regions (also known as an inter-region VPC peering connection).
Inter-Region VPC Peering provides a simple and cost-effective way to share resources between regions or replicate data for geographic redundancy. Built on the same horizontally scaled, redundant, and highly available technology that powers VPC today, Inter-Region VPC Peering encrypts inter-region traffic with no single point of failure or bandwidth bottleneck. Traffic using Inter-Region VPC Peering always stays on the global AWS backbone and never traverses the public internet, thereby reducing threat vectors, such as common exploits and DDoS attacks.
Hence, the correct answers are:
- Set up a VPC peering connection between the VPCs.
- Re-configure the route table's target and destination of the instances' subnet.
The option that says: Create an Egress only Internet Gateway is incorrect because this will just enable outbound IPv6 communication from instances in a VPC to the internet. Take note that the scenario requires private communication to be enabled between VPCs from two different regions.
The option that says: Launch a NAT Gateway in the public subnet of each VPC is incorrect because NAT Gateways are used to allow instances in private subnets to access the public internet. Note that the requirement is to make sure that communication between instances will not traverse the internet.
The option that says: Deploy a VPC endpoint on each region to enable private connection is incorrect.
VPC endpoints are region-specific only and do not support inter-region communication.
References:
https://docs.aws.amazon.com/vpc/latest/peering/what-is-vpc-peering.html
https://aws.amazon.com/about-aws/whats-new/2017/11/announcing-support-for-inter-region-vpc-peering
/
Check out this Amazon VPC Cheat Sheet:
https://tutorialsdojo.com/amazon-vpc/
질문 # 492
A company has a single AWS account that contains resources belonging to several teams. The company needs to identify the costs associated with each team. The company wants to use a tag named CostCenter to identify resources that belong to each team.
정답：A,C
설명：
To track costs associated with different teams within a single AWS account, the company should implement user-defined cost allocation tags.
Tagging Resources with CostCenter: Assign the CostCenter tag to all resources, specifying the appropriate value for each team. This practice enables the organization to categorize and track AWS costs effectively.
Activating the CostCenter Tag: After tagging resources, activate the CostCenter tag in the AWS Billing and Cost Management console. Activation is necessary for the tags to appear in cost allocation reports and AWS Cost Explorer.
By following these steps, the company can generate detailed billing reports that break down costs by team, facilitating better cost management and accountability.
References:
Organizing and tracking costs using AWS cost allocation tags
Activating user-defined cost allocation tags
질문 # 493
A rapidly growing global ecommerce company is hosting its web application on AWS. The web application includes static content and dynamic content. The website stores online transaction processing (OLTP) data in an Amazon RDS database. The website's users are experiencing slow page loads.
Which combination of actions should a solutions architect take to resolve this issue? (Select TWO.)
정답：D,E
설명：
Explanation
To resolve the issue of slow page loads for a rapidly growing e-commerce website hosted on AWS, a solutions architect can take the following two actions:
1. Set up an Amazon CloudFront distribution
2. Create a read replica for the RDS DB instance
Configuring an Amazon Redshift cluster is not relevant to this issue since Redshift is a data warehousing service and is typically used for the analytical processing of large amounts of data.
Hosting the dynamic web content in Amazon S3 may not necessarily improve performance since S3 is an object storage service, not a web application server. While S3 can be used to host static web content, it may not be suitable for hosting dynamic web content since S3 doesn't support server-side scripting or processing.
Configuring a Multi-AZ deployment for the RDS DB instance will improve high availability but may not necessarily improve performance.
질문 # 494
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