AWS - Elastic Load Balancing
An Application Load Balancer spans three Availability Zones with cross-zone load balancing enabled. Zone A has 2 healthy targets, Zone B has 4, and Zone C has 1. How does the ALB distribute incoming requests?
How does the ALB distribute incoming requests?
hard📝 Architecture Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand ALB cross-zone load balancing behavior
With cross-zone load balancing enabled, the ALB distributes traffic evenly across all healthy targets in all enabled zones, regardless of the number of targets per zone.Step 2: Analyze the distribution
Since Zone C has only 1 target, it will receive fewer requests proportionally, but traffic is balanced per target, not per zone.Step 3: Eliminate incorrect options
It sends more traffic to Zone B because it has the most targets, ignoring cross-zone load balancing. is incorrect because cross-zone load balancing prevents zone-based traffic bias. It routes all traffic to Zone A to balance latency and availability. and D are not valid ALB behaviors.Final Answer:
It distributes traffic evenly across all targets regardless of zone, so Zone C receives fewer requests due to fewer targets. -> Option DQuick Check:
ALB with cross-zone balances per target, not per zone [OK]
Quick Trick: ALB balances traffic evenly per target across zones [OK]
Common Mistakes:
MISTAKES- Assuming traffic is balanced per zone instead of per target
- Believing zones with fewer targets get no traffic
- Confusing ALB behavior with Classic Load Balancer
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