Deploy scalable and highly available databases in Google Cloud →mediumMultiple SelectObjective-mapped
PCDE Practice Question: Deploy scalable and highly available databases in Google Cloud
A company is planning disaster recovery for Bigtable. They have two clusters in different regions with replication enabled. They want to automate failover using Cloud DNS. Which THREE components are required for this automation? (Choose 3)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cloud HTTP(S) health check for the Bigtable cluster endpoints.
To automate Bigtable failover, you need a Cloud HTTP(S) health check to monitor the primary cluster, a Cloud DNS routing policy (e.g., weighted round robin) that can be updated, and a mechanism (e.g., Cloud Functions or an external tool) to update the DNS record when the health check fails.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Bigtable replication routing policy set to any-replica.
Why it's wrong here
any-replica does not assist in failover automation.
- ✗
Cloud Bigtable AppProfile with single-cluster routing.
Why it's wrong here
AppProfiles configure client-side routing, not DNS-based failover.
- ✓
Cloud HTTP(S) health check for the Bigtable cluster endpoints.
Why this is correct
Health checks determine primary cluster health.
- ✓
Cloud Functions to update the DNS record on health check failure.
Why this is correct
Automation to change DNS routing when primary is unhealthy.
- ✓
Cloud DNS managed zone with a weighted routing policy.
Why this is correct
Weighted routing directs traffic to primary or secondary based on health.
Visual reference
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCDE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCDE exam.