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| Section | Weight | Objectives |
|---|---|---|
| Design Cost-Optimized Architectures | 20% | - Design cost-optimized compute solutions
|
| Design High-Performing Architectures | 24% | - Determine high-performing database solutions
|
| Design Resilient Architectures | 26% | - Design scalable and loosely coupled architectures
|
| Design Secure Architectures | 30% | - Design secure access to AWS resources
|
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問題 #633
[Design Secure Architectures]
A company uses a three-tier web application to provide training to new employees. The application is accessed for only 12 hours every day. The company is using an Amazon RDS for MySQL DB instance to store information and wants to minimize costs.
What should a solutions architect do to meet these requirements?
答案：D
解題說明：
In a typical development environment, dev and test databases are mostly utilized for 8 hours a day and sit idle when not in use. However, the databases are billed for the compute and storage costs during this idle time. To reduce the overall cost, Amazon RDS allows instances to be stopped temporarily. While the instance is stopped, you're charged for storage and backups, but not for the DB instance hours. Please note that a stopped instance will automatically be started after 7 days. This post presents a solution using AWS Lambda and Amazon EventBridge that allows you to schedule a Lambda function to stop and start the idle databases with specific tags to save on compute costs. The second post presents a solution that accomplishes stop and start of the idle Amazon RDS databases using AWS Systems Manager.
問題 #634
A company has an ordering application that stores customer information in Amazon RDS for MySQL. During regular business hours, employees run one-time queries for reporting purposes. Timeouts are occurring during order processing because the reporting queries are taking a long time to run. The company needs to eliminate the timeouts without preventing employees from performing queries.
答案：B
解題說明：
Comprehensive and Detailed
Amazon RDS for MySQL supports the creation of read replicas, which are read-only copies of the primary database instance. By offloading read-heavy operations, such as reporting queries, to a read replica:
Performance Improvement: The primary DB instance is relieved from the additional load, reducing the likelihood of timeouts during order processing.
Data Consistency: Read replicas use asynchronous replication, ensuring that they have up-to-date data for accurate reporting.
Scalability: Multiple read replicas can be created to handle increased read traffic.
This approach allows employees to continue running necessary reports without impacting the performance of the ordering application.
問題 #635
A company plans to design a highly available architecture in AWS. They have two target groups with three EC2 instances each, which are added to an Application Load Balancer. In the security group of the EC2 instance, you have verified that port 80 for HTTP is allowed. However, the instances are still showing out of service from the load balancer.
What could be the root cause of this issue?
答案：D
解題說明：
Since the security group is properly configured, the issue may be caused by a wrong health check configuration in the Target Group.
Your Application Load Balancer periodically sends requests to its registered targets to test their status.
These tests are called health checks. Each load balancer node routes requests only to the healthy targets in the enabled Availability Zones for the load balancer. Each load balancer node checks the health of each target, using the health check settings for the target group with which the target is registered. After your target is registered, it must pass one health check to be considered healthy. After each health check is completed, the load balancer node closes the connection that was established for the health check.
Explanation:
Reference:
http://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-healthchecks.html AWS Elastic Load Balancing Overview:
https://www.youtube.com/watch?v=UBl5dw59DO8
Check out this AWS Elastic Load Balancing (ELB) Cheat Sheet:
https://tutorialsdojo.com/aws-elastic-load-balancing-elb/
ELB Health Checks vs Route 53 Health Checks For Target Health Monitoring:
https://tutorialsdojo.com/elb-health-checks-vs-route-53-health-checks-for-target-health-monitoring/
問題 #636
[Design Resilient Architectures]
A company wants to run a gaming application on Amazon EC2 instances that are part of an Auto Scaling group in the AWS Cloud. The application will transmit data by using UDP packets. The company wants to ensure that the application can scale out and in as traffic increases and decreases.
What should a solutions architect do to meet these requirements?
答案：D
解題說明：
This solution meets the requirements of running a gaming application that transmits data by using UDP packets and scaling out and in as traffic increases and decreases. A Network Load Balancer can handle millions of requests per second while maintaining high throughput at ultra low latency, and it supports both TCP and UDP protocols. An Auto Scaling group can automatically adjust the number of EC2 instances based on the demand and the scaling policies.
Option B is incorrect because an Application Load Balancer does not support UDP protocol, only HTTP and HTTPS. Option C is incorrect because Amazon Route 53 is a DNS service that can route traffic based on different policies, but it does not provide load balancing or scaling capabilities. Option D is incorrect because a NAT instance is used to enable instances in a private subnet to connect to the internet or other AWS services, but it does not provide load balancing or scaling capabilities.
Reference:
https://aws.amazon.com/blogs/aws/new-udp-load-balancing-for-network-load-balancer/
https://docs.aws.amazon.com/autoscaling/ec2/userguide/AutoScalingGroup.html
問題 #637
A financial company is migrating its banking applications to a set of AWS accounts managed by AWS Organizations. The applications will store sensitive customer data on Amazon Elastic Block Store (Amazon EBS) volumes. The company will take regular snapshots for backup purposes.
The company wants to implement controls across all AWS accounts to prevent sharing EBS snapshots publicly.
Which solution will meet these requirements with the LEAST operational overhead?
答案：B
解題說明：
AWS Config supports organization-wide rules that can automatically monitor and enforce EBS snapshot permissions across all accounts in an AWS Organization, preventing public sharing with minimal operational overhead.
問題 #638
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