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Why might a Cloud Load Balancer fail to provide high availability if all backend instances are in a single zone?

medium📝 Debug Q7 of 15
GCP - Cloud SQL and Databases
Why might a Cloud Load Balancer fail to provide high availability if all backend instances are in a single zone?
AZone failure causes all instances to be unreachable
BLoad balancer cannot route traffic within one zone
CHealth checks do not work in single-zone setups
DInstances in one zone cause billing errors
Step-by-Step Solution
Solution:

  1. Step 1: Understand zone failure impact

    If all instances are in one zone, failure of that zone means no healthy instances remain.

  2. Step 2: Identify limitation of single-zone backend

    Load balancer cannot route traffic to other zones if no instances exist there.

  3. Final Answer:

    Zone failure causes all instances to be unreachable -> Option A

  4. Quick Check:

    Single-zone backend risks total outage [OK]
Quick Trick: Distribute instances across zones for true availability [OK]
Common Mistakes:
  • Thinking load balancer fails inside one zone
  • Believing health checks don't work in single zone
  • Confusing billing with availability

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