Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 639 discussion

"favor one EC2 instance" it is because you enable the sticky session feature, so you have to disable it

Answer: *A* Enabling stickiness may bring imbalance to the load over the backend EC2 instances since sticky sessions help the same client to always redirect to the same instance behind a load balancer.

The question is too vague. Doesn't say much about the application or EC2 instance setup. So: If you assume that application uses session management then A is correct. If you think application is crashing then D is correct for health checks If you don't assume anything about the application then B is also correct SMH, I'll go with B... happy to discuss

what about c? it actually helps distribute traffic equally across instances in all enabled AZs.

it's A!! Session affinity is a feature of the Application Load Balancer that keeps client requests on the same EC2 instance for the duration of the session. This can cause latency issues if one EC2 instance is overloaded while others are not, as the overloaded instance will handle all subsequent requests until it is taken offline. To resolve this issue, the solutions architect should disable session affinity on the ALB. This can be done by setting the "Session affinity" parameter to "Off" in the ALB's configuration. Disabling session affinity will cause the ALB to distribute requests across all EC2 instances in the target group, rather than keeping them on a single instance. This will help to balance the load and reduce latency for all requests.

Disable session affinity (sticky sessions) on the ALB

A https://repost.aws/knowledge-center/elb-fix-unequal-traffic-routing

A makes more sense than others