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Question 473 - SAA-C03 discussion

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A company operates an ecommerce website on Amazon EC2 instances behind an Application Load Balancer (ALB) in an Auto Scaling group. The site is experiencing performance issues related to a high request rate from illegitimate external systems with changing IP addresses. The security team is worried about potential DDoS attacks against the website. The company must block the illegitimate incoming requests in a way that has a minimal impact on legitimate users.

What should a solutions architect recommend?

A.
Deploy Amazon Inspector and associate it with the ALB.
Answers
A.
Deploy Amazon Inspector and associate it with the ALB.
B.
Deploy AWS WAF, associate it with the ALB, and configure a rate-limiting rule.
Answers
B.
Deploy AWS WAF, associate it with the ALB, and configure a rate-limiting rule.
C.
Deploy rules to the network ACLs associated with the ALB to block the incoming traffic.
Answers
C.
Deploy rules to the network ACLs associated with the ALB to block the incoming traffic.
D.
Deploy Amazon GuardDuty and enable rate-limiting protection when configuring GuardDuty.
Answers
D.
Deploy Amazon GuardDuty and enable rate-limiting protection when configuring GuardDuty.
Suggested answer: B

Explanation:

This answer is correct because it meets the requirements of blocking the illegitimate incoming requests in a way that has a minimal impact on legitimate users. AWS WAF is a web application firewall that helps protect your web applications or APIs against common web exploits that may affect availability, compromise security, or consume excessive resources. AWS WAF gives you control over how traffic reaches your applications by enabling you to create security rules that block common attack patterns, such as SQL injection or cross-site scripting, and rules that filter out specific traffic patterns you define. You can associate AWS WAF with an ALB to protect the web application from malicious requests. You can configure a rate-limiting rule in AWS WAF to track the rate of requests for each originating IP address and block requests from an IP address that exceeds a certain limit within a five-minute period. This way, you can mitigate potential DDoS attacks and improve the performance of your website.

https://docs.aws.amazon.com/waf/latest/developerguide/what-is-aws-waf.html

https://docs.aws.amazon.com/waf/latest/developerguide/waf-rule-statement-type-rate-based.html

asked 16/09/2024
TAMPO DARKOI
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