Quick Answer
The answer is the `terraform plan` command. This command is the correct feature because it generates an execution plan by comparing your current infrastructure state against your configuration files, producing a detailed diff of every resource that will be created, modified, or destroyed—exactly what the developer needs to review changes before applying them. On the HashiCorp Terraform Associate TF-003 exam, this question tests your understanding of the Terraform workflow's safety net: `terraform plan` acts as a dry run that never changes real infrastructure, and a common trap is confusing it with `terraform apply`, which actually executes changes. Remember that `plan` is your preview, `apply` is your action. For a quick memory tip, think of `terraform plan` as the "pause and preview" step—it shows you the road ahead without taking a single step, ensuring you never blindly modify resources like S3 buckets or security groups.
This TF-003 practice question tests your understanding of understand terraform's purpose. 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.
A developer runs `terraform plan` and sees that Terraform will create a new S3 bucket and modify a security group. Which Terraform feature allows the developer to review these changes before applying them?
The `terraform apply` command
Why wrong: Apply executes changes, not preview.
The `terraform validate` command
Why wrong: Validate checks syntax, not changes.
The `terraform plan` command
Plan shows a preview of changes.
The `terraform state` command
Why wrong: State manages mappings, not preview of changes.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The `terraform plan` command
The `terraform plan` command creates an execution plan that shows what actions Terraform will take to achieve the desired state defined in the configuration. It compares the current state with the configuration and outputs a diff-like summary of resources to be created, modified, or destroyed, allowing the developer to review changes before applying them with `terraform apply`.
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 `terraform apply` command
Why it's wrong here
Apply executes changes, not preview.
The `terraform validate` command
Why it's wrong here
Validate checks syntax, not changes.
The `terraform plan` command
Why this is correct
Plan shows a preview of changes.
Related concept
Read the scenario before looking for a memorised answer.
The `terraform state` command
Why it's wrong here
State manages mappings, not preview of changes.
Common exam traps
HashiCorp often tests the distinction between `terraform plan` as a read-only preview and `terraform apply` as the execution command, trapping candidates who confuse 'review' with 'apply' or think `terraform validate` performs a dry-run.
Detailed technical explanation
Under the hood, `terraform plan` performs a three-way diff between the configuration, the current state file (which may be stored locally or remotely in a backend like S3), and the actual infrastructure state fetched via provider APIs. It uses the resource graph to determine dependencies and the order of operations, and the resulting plan can be saved as a binary file (e.g., `plan.tfplan`) for later execution with `terraform apply plan.tfplan`, ensuring the exact same changes are applied.
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
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Understand Terraform's purpose — study guide chapter
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Related practice questions
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
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FAQ
Understand Terraform's purpose — This question tests Understand Terraform's purpose — Read the scenario before looking for a memorised answer..
The correct answer is: The `terraform plan` command — The `terraform plan` command creates an execution plan that shows what actions Terraform will take to achieve the desired state defined in the configuration. It compares the current state with the configuration and outputs a diff-like summary of resources to be created, modified, or destroyed, allowing the developer to review changes before applying them with `terraform apply`.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This TF-003 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-003 exam.
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