An application is deployed across two Availability Zones (AZs) with an Elastic Load Balancer (ELB). If one AZ becomes unreachable, how does the ELB handle incoming requests?

medium📝 Predict Output Q4 of 15

AWS - Architecture Best Practices

AIt automatically routes all traffic to the healthy instances in the remaining AZ.

BIt stops routing traffic until the failed AZ recovers.

CIt distributes traffic evenly including the failed AZ instances.

DIt redirects traffic to instances in a different AWS region.

Step-by-Step Solution

Solution:

Step 1: Understand ELB behavior
ELB monitors instance health and routes traffic only to healthy instances.
Step 2: Impact of AZ failure
If one AZ fails, ELB stops sending traffic to instances in that AZ.
Final Answer:
It automatically routes all traffic to the healthy instances in the remaining AZ. -> Option A
Quick Check:
ELB health checks prevent routing to unhealthy AZs [OK]

Quick Trick: ELB routes only to healthy instances across AZs [OK]

Common Mistakes:

Assuming ELB continues routing to failed AZ
Believing ELB pauses traffic during AZ failure
Thinking ELB redirects traffic to other regions automatically

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More AWS Quizzes

An application is deployed across two Availability Zones (AZs) with an Elastic Load Balancer (ELB). If one AZ becomes unreachable, how does the ELB handle incoming requests?

Step 1: Understand ELB behavior

Step 2: Impact of AZ failure

Final Answer:

Quick Check:

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