After deploying a load balancer, you observe that one backend instance receives significantly more traffic than others. What is the most probable reason?

medium📝 Debug Q6 of 15

GCP - Cloud Load Balancing

AThe firewall is blocking traffic to all but one instance

BThe load balancer is configured with an incorrect IP address

CBackend instances are all unhealthy and not serving traffic

DSession affinity is enabled, causing repeated traffic to the same instance

Step-by-Step Solution

Solution:

Step 1: Analyze uneven traffic distribution
Uneven traffic often results from session affinity settings.
Step 2: Evaluate options
Session affinity is enabled, causing repeated traffic to the same instance explains repeated traffic to one instance due to session affinity; others are less likely causes.
Final Answer:
Session affinity is enabled, causing repeated traffic to the same instance -> Option D
Quick Check:
Session affinity directs clients to the same backend [OK]

Quick Trick: Session affinity causes sticky sessions to one server [OK]

Common Mistakes:

Assuming IP misconfiguration causes uneven traffic
Believing all backends are unhealthy without checking health
Ignoring firewall rules as a cause

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More GCP Quizzes

After deploying a load balancer, you observe that one backend instance receives significantly more traffic than others. What is the most probable reason?

Step 1: Analyze uneven traffic distribution

Step 2: Evaluate options

Final Answer:

Quick Check:

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