A Company Is Hosting a Web Application on Amazon EC2

question 178

Multiple Choice

A company is hosting a web application on Amazon EC2 instances behind an Application Load Balancer (ALB) . The application has become the target of a DoS attack. Application logging shows that requests are coming from small number of client IP addresses, but the addresses change regularly. The company needs to block the malicious traffic with a solution that requires the least amount of ongoing effort. Which solution meets these requirements?

• A) Create an AWS WAF rate-based rule, and attach it to the ALB.
• B) Update the security group that is attached to the ALB to block the attacking IP addresses.
• C) Update the ALB subnet's network ACL to block the attacking client IP addresses.
• D) Create a AWS WAF rate-based rule, and attach it to the security group of the EC2 instances.

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