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Question 669 - SAA-C03 discussion

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A company runs a highly available web application on Amazon EC2 instances behind an Application Load Balancer The company uses Amazon CloudWatch metrics

As the traffic to the web application Increases, some EC2 instances become overloaded with many outstanding requests The CloudWatch metrics show that the number of requests processed and the time to receive the responses from some EC2 instances are both higher compared to other EC2 instances The company does not want new requests to be forwarded to the EC2 instances that are already overloaded.

Which solution will meet these requirements?

A.
Use the round robin routing algorithm based on the RequestCountPerTarget and Active Connection Count CloudWatch metrics.
Answers
A.
Use the round robin routing algorithm based on the RequestCountPerTarget and Active Connection Count CloudWatch metrics.
B.
Use the least outstanding requests algorithm based on the RequestCountPerTarget and ActiveConnectionCount CloudWatch metrics.
Answers
B.
Use the least outstanding requests algorithm based on the RequestCountPerTarget and ActiveConnectionCount CloudWatch metrics.
C.
Use the round robin routing algorithm based on the RequestCount and TargetResponseTime CloudWatch metrics.
Answers
C.
Use the round robin routing algorithm based on the RequestCount and TargetResponseTime CloudWatch metrics.
D.
Use the least outstanding requests algorithm based on the RequestCount and TargetResponseTime CloudWatch metrics.
Answers
D.
Use the least outstanding requests algorithm based on the RequestCount and TargetResponseTime CloudWatch metrics.
Suggested answer: D

Explanation:

The least outstanding requests (LOR) algorithm is a load balancing algorithm that distributes incoming requests to the target with the fewest outstanding requests. This helps to avoid overloading any single target and improves the overall performance and availability of the web application. The LOR algorithm can use the RequestCount and TargetResponseTime CloudWatch metrics to determine the number of outstanding requests and the response time of each target. These metrics measure the number of requests processed by each target and the time elapsed after the request leaves the load balancer until a response from the target is received by the load balancer, respectively. By using these metrics, the LOR algorithm can route new requests to the targets that are less busy and more responsive, and avoid sending requests to the targets that are already overloaded or slow. This solution meets the requirements of the company.

Application Load Balancer now supports Least Outstanding Requests algorithm for load balancing requests

Target groups for your Application Load Balancers

Elastic Load Balancing - Application Load Balancers

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asked 16/09/2024
Jeffrey Ding
35 questions
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