TF-003 Interact with Terraform modules Practice Question
This TF-003 practice question tests your understanding of interact with terraform modules. 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.
A team is using a module from the public Terraform Registry. They want to ensure that the module is pinned to a specific version to avoid unexpected changes. Which approach should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set 'version' in the module's source attribute, e.g., source = "terraform-aws-modules/vpc/aws" with version = "3.2.0".
Option C is correct because the Terraform Registry module syntax requires the version constraint to be specified as a separate argument within the module block, not embedded in the source string. Pinning to a specific version (e.g., "3.2.0") ensures that only that exact module version is used, preventing unexpected changes from upstream updates. This is the standard approach for versioning public registry modules in Terraform.
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.
✗
Use 'required_providers' block in the root module to lock the module version.
Why it's wrong here
required_providers is for provider versions, not module versions.
✗
Add a 'version' argument inside the module block.
Why it's wrong here
The version is specified in the source, not as a separate argument of the module block.
✓
Set 'version' in the module's source attribute, e.g., source = "terraform-aws-modules/vpc/aws" with version = "3.2.0".
Why this is correct
Correct. The version constraint is specified as an argument in the module block alongside the source.
Related concept
Read the scenario before looking for a memorised answer.
✗
Store the module locally in a vendor directory and reference it by path.
Why it's wrong here
While possible, it's not the standard approach for version pinning from the registry.
Common exam traps
Common exam trap: answer the scenario, not the keyword
HashiCorp often tests the distinction between provider versioning (required_providers) and module versioning (version argument in the module block), and the trap here is that candidates confuse the two or think the version can be embedded in the source string.
Detailed technical explanation
How to think about this question
When Terraform resolves a module from the public registry, it uses the source address to locate the module and then applies the version constraint to select a specific release. The version argument supports version constraint syntax (e.g., "~> 3.0", ">= 3.0, < 4.0"), but pinning to an exact version like "3.2.0" is the most restrictive. Under the hood, Terraform downloads the module into its local cache and records the resolved version in the dependency lock file (.terraform.lock.hcl) only for providers, not for modules, making explicit version pinning critical for reproducibility.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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.
Interact with Terraform modules — This question tests Interact with Terraform modules — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Set 'version' in the module's source attribute, e.g., source = "terraform-aws-modules/vpc/aws" with version = "3.2.0". — Option C is correct because the Terraform Registry module syntax requires the version constraint to be specified as a separate argument within the module block, not embedded in the source string. Pinning to a specific version (e.g., "3.2.0") ensures that only that exact module version is used, preventing unexpected changes from upstream updates. This is the standard approach for versioning public registry modules in Terraform.
What should I do if I get this TF-003 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.
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Question Discussion
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