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If a target group has 4 registered targets and 2 are unhealthy, how does the Application Load Balancer handle incoming requests?

medium📝 service behavior Q4 of 15
AWS - Elastic Load Balancing
If a target group has 4 registered targets and 2 are unhealthy, how does the Application Load Balancer handle incoming requests?
AIt routes traffic only to the 2 healthy targets, ignoring the unhealthy ones.
BIt distributes traffic evenly among all 4 targets regardless of health.
CIt stops routing traffic until all targets become healthy.
DIt routes traffic only to the first registered target.
Step-by-Step Solution
Solution:

  1. Step 1: Understand ALB health check behavior

    ALB routes traffic only to healthy targets in the target group.

  2. Step 2: Apply to scenario

    With 2 healthy and 2 unhealthy targets, traffic is sent only to the healthy ones.

  3. Final Answer:

    It routes traffic only to the 2 healthy targets, ignoring the unhealthy ones. correctly describes this behavior.

  4. Quick Check:

    ALB ignores unhealthy targets when routing [OK]
Quick Trick: Load balancer sends traffic only to healthy targets [OK]
Common Mistakes:
MISTAKES
  • Assuming traffic is sent to unhealthy targets
  • Thinking ALB stops routing if any target is unhealthy
  • Believing traffic goes only to one target

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