This TF-003 practice question tests your understanding of use terraform outside the core workflow. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 operator runs `terraform apply` and receives an error that the state file is locked. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
The state file is outdated and needs refresh
Why wrong: Does not cause a lock error.
The configuration has a syntax error
Why wrong: Caught during plan or validate.
Another user is running a Terraform operation
State locking prevents concurrent operations.
The user lacks write permissions to the state file
Why wrong: Would cause a permission denied error, not a lock.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Another user is running a Terraform operation
Option C is correct because Terraform uses a state locking mechanism (typically via a backend like S3 with DynamoDB, or Consul) to prevent concurrent operations from corrupting the state file. When another user or process is running a Terraform operation (e.g., `apply`, `plan`, `destroy`), the lock is held, and any subsequent `terraform apply` will fail with a 'state file is locked' error. This is a fundamental safety feature to ensure state consistency.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
The state file is outdated and needs refresh
Why it's wrong here
Does not cause a lock error.
The configuration has a syntax error
Why it's wrong here
Caught during plan or validate.
Another user is running a Terraform operation
Why this is correct
State locking prevents concurrent operations.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
The user lacks write permissions to the state file
Why it's wrong here
Would cause a permission denied error, not a lock.
Common exam traps
The trap here is that candidates confuse state locking with file permissions (Option D) or assume the error is due to a stale state (Option A), but Cisco specifically tests the understanding that locking is a concurrency control mechanism, not a permission or syntax issue.
Detailed technical explanation
State locking is typically implemented using a distributed lock system: in AWS S3 backends, DynamoDB is used to create a lock entry with a unique lock ID and a time-to-live (TTL) for automatic release. If a lock is held and the lock holder crashes, the lock may remain until the TTL expires (default 1 hour in some backends), requiring manual intervention via `terraform force-unlock <lock_id>`. Real-world scenarios include CI/CD pipelines where multiple jobs accidentally target the same state file, or team members running `apply` simultaneously without remote state locking awareness.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the TF-003 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
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FAQ
Use Terraform outside the core workflow — This question tests Use Terraform outside the core workflow — Read the scenario before looking for a memorised answer..
The correct answer is: Another user is running a Terraform operation — Option C is correct because Terraform uses a state locking mechanism (typically via a backend like S3 with DynamoDB, or Consul) to prevent concurrent operations from corrupting the state file. When another user or process is running a Terraform operation (e.g., `apply`, `plan`, `destroy`), the lock is held, and any subsequent `terraform apply` will fail with a 'state file is locked' error. This is a fundamental safety feature to ensure state consistency.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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