AWS - Elastic Load Balancing
If an NLB is configured with cross-zone load balancing disabled and has targets in two availability zones, how is traffic distributed?
If an NLB is configured with cross-zone load balancing disabled and has targets in two availability zones, how is traffic distributed?
medium📝 Predict Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand cross-zone load balancing
When cross-zone load balancing is disabled, NLB routes traffic only to targets in the same availability zone as the load balancer node.Step 2: Analyze traffic distribution
This behavior reduces cross-zone data transfer costs but may cause uneven load if zones have different target counts.Final Answer:
Traffic is routed only to targets in the load balancer node's availability zone -> Option BQuick Check:
Cross-zone disabled = zone-local traffic routing [OK]
Quick Trick: Cross-zone off means traffic stays in LB node's zone [OK]
Common Mistakes:
- Assuming traffic is evenly across all zones
- Thinking traffic goes only to first zone
- Believing routing is random
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