The answer is to look within the clusters list of the instance description output. This is correct because the `gcloud bigtable instances describe` command returns a JSON structure where the `clusters` array contains one object per cluster; replication is only active when multiple clusters exist, as each cluster object includes fields like `replication` and `nodes` that confirm the configuration. On the Google Professional Cloud Database Engineer exam, this tests your ability to interpret CLI output for high-availability setups, often appearing in scenario-based questions where a developer runs a command to verify Bigtable replication using gcloud. A common trap is assuming a single cluster with many nodes implies replication, but replication requires distinct clusters in different zones. Memory tip: think “clusters count = replication status” — if you see only one cluster in the list, replication is off; two or more means it’s on.
PCDE Plan and manage database infrastructure Practice Question
This PCDE practice question tests your understanding of plan and manage database infrastructure. 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.
Exhibit
Refer to the exhibit.
gcloud bigtable instances describe my-bigtable-instance
--format="json"
{
"name": "my-bigtable-instance",
"displayName": "my-bigtable-instance",
"instanceType": "PRODUCTION",
"state": "READY"
}
A developer runs the command shown in the exhibit and wants to verify that replication is enabled on the Bigtable instance. Where should they look for this information in the output?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
View the 'clusters' list within the instance description.
Option C is correct because the `gcloud bigtable instances describe` command returns a JSON representation of the instance, which includes a `clusters` list. Each cluster object in that list contains a `replication` field (e.g., `defaultStorageType` and `nodes`), and the presence of multiple clusters in the list indicates that replication is configured. Replication in Cloud Bigtable is enabled by adding more than one cluster to the instance, so examining the `clusters` list directly shows whether replication is active.
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.
✗
Examine the 'instanceType' field for 'MULTI_CLUSTER'.
Why it's wrong here
instanceType only distinguishes production vs development.
✗
Look for a 'replication' field in the JSON.
Why it's wrong here
The command output as shown does not include a replication field.
✓
View the 'clusters' list within the instance description.
Why this is correct
Clusters indicate replication if multiple clusters exist.
Related concept
Read the scenario before looking for a memorised answer.
✗
Check the 'state' field for 'REPLICATED'.
Why it's wrong here
State only indicates if instance is ready.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the `instanceType` field (which is `PRODUCTION` or `DEVELOPMENT`) with replication status, or expect a dedicated `replication` boolean field, when in fact replication is indicated by the presence of multiple clusters in the `clusters` list.
Trap categories for this question
Command / output trap
The command output as shown does not include a replication field.
Detailed technical explanation
How to think about this question
Under the hood, Cloud Bigtable replication is achieved by adding clusters in different zones within the same instance; each cluster has its own set of nodes and storage. The `gcloud bigtable instances describe` command returns the `clusters` array, where each cluster object includes fields like `name`, `location`, `serveNodes`, and `defaultStorageType`. A real-world scenario: if a developer sees only one cluster in the list, replication is not enabled; adding a second cluster automatically enables replication, and the data is replicated asynchronously across clusters using Google's internal replication protocol.
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.
TExam Day Tips
→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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Plan and manage database infrastructure — This question tests Plan and manage database infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: View the 'clusters' list within the instance description. — Option C is correct because the `gcloud bigtable instances describe` command returns a JSON representation of the instance, which includes a `clusters` list. Each cluster object in that list contains a `replication` field (e.g., `defaultStorageType` and `nodes`), and the presence of multiple clusters in the list indicates that replication is configured. Replication in Cloud Bigtable is enabled by adding more than one cluster to the instance, so examining the `clusters` list directly shows whether replication is active.
What should I do if I get this PCDE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.