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SCS-C02 · Question #188

A company has a web-based application that runs behind an Application Load Balancer (ALB). The application is experiencing a credential stuffing attack that is producing many failed login attempts. Th

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Submitted by rohit_dlh· Mar 6, 2026Infrastructure Security

Question

A company has a web-based application that runs behind an Application Load Balancer (ALB). The application is experiencing a credential stuffing attack that is producing many failed login attempts. The attack is coming from many IP addresses. The login attempts are using a user agent string of a known mobile device emulator. A security engineer needs to implement a solution to mitigate the credential stuffing attack. The solution must still allow legitimate logins to the application. Which solution will meet these requirements?

Options

  • ACreate an Amazon CloudWatch alarm that reacts to login attempts that contain the specified user
  • BModify the inbound security group on the ALB to deny traffic from the IP addresses that are
  • CCreate an AWS WAF web ACL for the ALB Create a custom rule that blocks requests that contain
  • DCreate an AWS WAF web ACL for the ALB. Create a custom rule that allows requests from

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Topics

#AWS WAF#credential stuffing#user agent rule#ALB protection
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