Quick Answer
The answer is variables.tf, along with main.tf and outputs.tf, as the three files that define the standard module structure in Terraform. This structure is a recommended convention established by HashiCorp to ensure modules are reusable, predictable, and easy to consume: main.tf contains the primary resource definitions, variables.tf declares the input parameters that allow users to customize the module, and outputs.tf exposes the resulting values for use by the calling configuration. On the HashiCorp Terraform Associate TF-003 exam, this question tests your understanding of module composition versus configuration files—a common trap is confusing terraform.tfvars (which assigns values to variables) or backend.tf (which configures state storage) as part of the module definition, when in fact they belong in the root module or are used at runtime. To remember this, think of the three pillars of a module: what it does (main), what it needs (variables), and what it gives back (outputs).
This TF-003 practice question tests your understanding of interact with terraform modules. 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.
Which THREE files are considered part of the standard module structure?
main.tf
Main resource definitions are typically in main.tf.
outputs.tf
Output values are declared in outputs.tf.
backend.tf
Why wrong: Backend configuration belongs to the root module, not a reusable module.
terraform.tfvars
Why wrong: This file provides variable values, not variable declarations; it's not part of the module structure.
variables.tf
Input variables are declared in variables.tf.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
main.tf
The standard module structure includes main.tf, variables.tf, and outputs.tf. Option C is wrong because terraform.tfvars is used to assign values, not part of module definition. Option E is wrong because backend.tf is for state configuration, which belongs in the root module.
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.
main.tf
Why this is correct
Main resource definitions are typically in main.tf.
Related concept
Read the scenario before looking for a memorised answer.
outputs.tf
Why this is correct
Output values are declared in outputs.tf.
Related concept
Read the scenario before looking for a memorised answer.
backend.tf
Why it's wrong here
Backend configuration belongs to the root module, not a reusable module.
terraform.tfvars
Why it's wrong here
This file provides variable values, not variable declarations; it's not part of the module structure.
variables.tf
Why this is correct
Input variables are declared in variables.tf.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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 TF-003 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Interact with Terraform modules — This question tests Interact with Terraform modules — Read the scenario before looking for a memorised answer..
The correct answer is: main.tf — The standard module structure includes main.tf, variables.tf, and outputs.tf. Option C is wrong because terraform.tfvars is used to assign values, not part of module definition. Option E is wrong because backend.tf is for state configuration, which belongs in the root module.
Identify which TF-003 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 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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