AWS - Elastic Load Balancing
Given a Classic Load Balancer with cross-zone load balancing disabled and 2 instances in zone A and 1 instance in zone B, where will most traffic be routed?
Given a Classic Load Balancer with cross-zone load balancing disabled and 2 instances in zone A and 1 instance in zone B, where will most traffic be routed?
medium📝 service behavior Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand behavior without cross-zone load balancing
Without cross-zone load balancing, traffic is distributed evenly across zones, then evenly within each zone.Step 2: Calculate traffic distribution
Zone A receives ~50% of traffic split between 2 instances (~25% each), zone B receives ~50% to the single instance (~50%). Thus, most traffic goes to the instance in zone B.Final Answer:
Traffic will mostly go to the instance in zone B -> Option BQuick Check:
Cross-zone disabled = instances in sparse zones overloaded [OK]
Quick Trick: Without cross-zone, zones get equal traffic regardless of instance count [OK]
Common Mistakes:
- Assuming traffic is evenly spread per instance
- Thinking traffic mostly goes to zone with more instances
- Believing traffic is blocked from any zone
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