TF-004 Implement and maintain state Practice Question
In a CI/CD pipeline, Terraform state is stored in Terraform Cloud. A pipeline run fails with the error: 'State version conflict'. What is the most likely cause?
⚠ Common exam trap
TF-004 often tests whether candidates can distinguish state locking/concurrency errors from authentication, backend, or version errors, tempting them toward 'backend misconfiguration' when the real signal is simultaneous runs.
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
✓
Two runs started at the same time
Terraform Cloud enforces state locking so that only one run can modify a given workspace's state at a time. When two runs (e.g., concurrent pipeline jobs, or a manual run overlapping a CI run) attempt to write state simultaneously, the second run fails with a 'state version conflict' because the state serial it read is no longer current. This is the classic concurrency symptom.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Authentication failure with Terraform Cloud
Why it's wrong here
An authentication failure with Terraform Cloud would prevent Terraform from establishing a secure connection or performing any operations requiring authorization. This would manifest as explicit "access denied" or "invalid credentials" errors during initialization or execution, halting the run entirely. It would not lead to a "State version conflict" because the system wouldn't even reach the point of attempting to compare or update state versions; it would fail much earlier due to lack of access.
- ✗
Missing or incorrect backend configuration
Why it's wrong here
A missing or incorrect backend configuration prevents Terraform from properly locating or connecting to the remote state storage. This would typically result in errors during the `terraform init` phase, such as "Error loading backend" or "No backend configuration found," as Terraform cannot determine where to manage the state. Such an issue would prevent any state operations from occurring, thus it cannot cause a "State version conflict," which implies successful access but a mismatch in the state's chronological order.
- ✗
State file exceeds maximum size limit
Why it's wrong here
If a Terraform state file were to exceed a maximum size limit imposed by the backend (e.g., Terraform Cloud or S3), the error message would explicitly indicate a storage constraint issue, such as "state file too large" or a similar capacity-related message. This is a distinct operational error related to resource limits, preventing the state from being written or updated due to its physical size. It would not manifest as a "State version conflict," which is a logical error indicating concurrent modifications or an outdated read.
- ✗
Terraform version mismatch between local and remote
Why it's wrong here
A mismatch between the local Terraform CLI version and the version expected by Terraform Cloud or used for remote operations would typically trigger warnings or errors related to version compatibility constraints. For instance, Terraform might warn that the state was written by a newer version or that certain features are incompatible. While this can prevent a run, it does not directly cause a "State version conflict," which specifically arises from concurrent attempts to modify the state or an outdated state read, rather than an incompatibility of the execution engine itself.
- ✓
Two runs started at the same time
Why this is correct
This is the most likely cause. When two runs are started at the same time, the second run may be based on an outdated state version because the first run's state write completes before the second run's state read. Terraform Cloud then detects the version mismatch and throws a 'State version conflict' error.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official HashiCorp exam blueprint
This TF-004 practice question is part of Courseiva's free HashiCorp 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 TF-004 exam.