Google Cloud Professional Cloud Architect · Free practice question 10 of 12
Cloud DNS failover routing policy
Ellingham Travel runs its booking site in a primary region with a warm standby in a second region, each behind a regional external Application Load Balancer. The deciding constraint is that DNS should send users to the standby automatically when the primary's health checks fail. Which DNS configuration should the architect use?
- A.A private DNS zone visible only inside the VPC network
- B.Two A records with a very short TTL edited by on-call engineers during outages
- C.A Cloud DNS failover routing policy with health checks on the primary target
- D.A weighted round robin routing policy that sends 50% of users to each region at all times
Show answer and explanation
Correct answer: C. A Cloud DNS failover routing policy with health checks on the primary target
Why: Cloud DNS failover routing policies answer with a primary target while health checks pass and switch to the backup target automatically when they fail. Weighted round robin sends half the traffic to the standby all the time. Manual record edits are slow and error-prone, and a private zone is not visible to internet users.
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