- A
Bigtable replication routing policy set to any-replica.
Why wrong: any-replica does not assist in failover automation.
- B
Cloud Bigtable AppProfile with single-cluster routing.
Why wrong: AppProfiles configure client-side routing, not DNS-based failover.
- C
Cloud HTTP(S) health check for the Bigtable cluster endpoints.
Health checks determine primary cluster health.
- D
Cloud Functions to update the DNS record on health check failure.
Automation to change DNS routing when primary is unhealthy.
- E
Cloud DNS managed zone with a weighted routing policy.
Weighted routing directs traffic to primary or secondary based on health.
Question 156 of 1,000
PCDOE Practice Question: Design for Reliability, Scalability, and Disaster Recovery
This PCDOE practice question tests your understanding of design for reliability, scalability, and disaster recovery. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Cloud Functions to update the DNS record on health check failure.
Why this is correct
Automation to change DNS routing when primary is unhealthy.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Cloud DNS managed zone with a weighted routing policy.
Why this is correct
Weighted routing directs traffic to primary or secondary based on health.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Visual reference
Quick reference
Common DNS Record Types
| Record | Purpose | Example |
|---|---|---|
| A | IPv4 address mapping | example.com → 93.184.216.34 |
| AAAA | IPv6 address mapping | example.com → 2606:2800::1 |
| CNAME | Alias to another hostname | www → example.com |
| MX | Mail server for domain | example.com → mail.example.com (priority 10) |
| TXT | Text data (SPF, DKIM, verification) | v=spf1 include:_spf.example.com ~all |
| NS | Authoritative name servers | example.com NS ns1.example.com |
| PTR | Reverse DNS (IP → hostname) | 34.216.184.93.in-addr.arpa → example.com |
| SOA | Zone authority record | Primary NS, admin email, serial, TTL defaults |
What to study next
Got this wrong? Here's your next step.
Identify which PCDOE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
- →
Design for Reliability, Scalability, and Disaster Recovery — study guide chapter
Learn the concepts, then practise the questions
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Design for Reliability, Scalability, and Disaster Recovery practice questions
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FAQ
Questions learners often ask
What does this PCDOE question test?
Design for Reliability, Scalability, and Disaster Recovery — This question tests Design for Reliability, Scalability, and Disaster Recovery — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this PCDOE question wrong?
Identify which PCDOE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
This PCDOE 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 PCDOE exam.
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