AWS - Elastic Load Balancing
If cross-zone load balancing is enabled on an Application Load Balancer, what happens when one zone has no healthy instances?
If cross-zone load balancing is enabled on an Application Load Balancer, what happens when one zone has no healthy instances?
medium📝 service behavior Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand ALB behavior with cross-zone enabled
ALB routes traffic only to healthy instances, even if cross-zone load balancing is enabled.Step 2: Check what happens if a zone has no healthy instances
Traffic is routed to healthy instances in other zones, not dropped or evenly sent to unhealthy zones.Final Answer:
Traffic is routed only to healthy instances in other zones -> Option BQuick Check:
ALB cross-zone skips unhealthy instances [OK]
Quick Trick: Traffic never goes to unhealthy instances even with cross-zone [OK]
Common Mistakes:
- Assuming traffic is dropped if a zone is unhealthy
- Thinking traffic is sent evenly regardless of health
- Believing load balancer stops if any zone is unhealthy
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