A company has a stateful web application that is hosted on Amazon EC2 instances in an Auto Scaling group. The instances run behind an Application Load Balancer (ALB) that has a single target group. Th

Question

Options

• AChange to the least outstanding requests algorithm on the ALB target group.
• BConfigure cookie forwarding in the CloudFront distribution cache behavior.
• CConfigure header forwarding in the CloudFront distribution cache behavior.
• DEnable group-level stickiness on the ALB listener rule.
• EEnable sticky sessions on the ALB target group.

• A
  11% (2)
• B
  72% (13)
• C
  11% (2)
• D
  6% (1)

Explanation

Configure cookie forwarding in the CloudFront distribution cache behavior. If CloudFront is not forwarding cookies, the origin (ALB/app) will not consistently receive the session cookie, causing users to appear “new” and get logged out. Forwarding cookies ensures the application can maintain user sessions correctly. Enable sticky sessions on the ALB target group. The application is stateful and stores session data on individual EC2 instances. Enabling ALB target group stickiness keeps a user’s requests going to the same instance, preventing session loss and random logouts as traffic shifts between instances.

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