- A
Dual-region configuration with 500 processing units
Dual-region offers synchronous replication across two regions (e.g., US and Europe) with strong consistency, and is more cost-effective than multi-region for moderate workloads.
- B
Multi-region configuration with 1000 nodes
Why wrong: Multi-region spans continents but is very expensive; 1000 nodes are excessive for a moderate workload.
- C
Regional configuration with 100 processing units
Why wrong: Regional provides only single-region availability and does not span continents.
- D
Multi-region configuration with 500 processing units
Why wrong: Multi-region is possible but more expensive than dual-region for moderate workloads.
Question 759 of 980
PCD Practice Question: Deploy Scalable and Highly Available Databases in Google Cloud
This PCD practice question tests your understanding of deploy scalable and highly available databases in google cloud. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
An engineer is deploying a Cloud Spanner instance for a global application that requires strong consistency across continents. The workload is moderate, and they want to minimize costs while meeting latency requirements. Which instance configuration should they choose?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
✓
Dual-region configuration with 500 processing units
Multi-region configurations provide strong global consistency and high availability across continents, but are expensive. Dual-region offers synchronous replication across two regions, a cost-effective option for moderate workloads needing strong consistency across two geographic areas. Regional is single-region, not global. Multi-region with 1000 nodes is overkill.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Dual-region configuration with 500 processing units
Why this is correct
Dual-region offers synchronous replication across two regions (e.g., US and Europe) with strong consistency, and is more cost-effective than multi-region for moderate workloads.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
Multi-region configuration with 1000 nodes
Why it's wrong here
Multi-region spans continents but is very expensive; 1000 nodes are excessive for a moderate workload.
- ✗
Regional configuration with 100 processing units
Why it's wrong here
Regional provides only single-region availability and does not span continents.
- ✗
Multi-region configuration with 500 processing units
Why it's wrong here
Multi-region is possible but more expensive than dual-region for moderate workloads.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
- OSPF neighbours must agree on key parameters.
- Router ID selection can affect neighbour relationships and LSDB output.
- OSPF cost influences the preferred path.
- A route can appear in OSPF information but not become the installed route.
TExam Day Tips
- Check area mismatch first when OSPF adjacency fails.
- Review passive interfaces when a network is advertised but no neighbour forms.
- Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related PCD OSPF questions on adjacency and route selection.
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FAQ
Questions learners often ask
What does this PCD question test?
Deploy Scalable and Highly Available Databases in Google Cloud — This question tests Deploy Scalable and Highly Available Databases in Google Cloud — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: Dual-region configuration with 500 processing units — Multi-region configurations provide strong global consistency and high availability across continents, but are expensive. Dual-region offers synchronous replication across two regions, a cost-effective option for moderate workloads needing strong consistency across two geographic areas. Regional is single-region, not global. Multi-region with 1000 nodes is overkill.
What should I do if I get this PCD question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related PCD OSPF questions on adjacency and route selection.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jul 4, 2026
This PCD 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 PCD exam.
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