Question 260 of 519

Interact with Terraform modules →easyMultiple ChoiceObjective-mapped

TF-003 Interact with Terraform modules Practice Question

This TF-003 practice question tests your understanding of interact with terraform modules. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.

Exhibit

Refer to the exhibit.

```hcl
module "vpc" {
  source  = "terraform-aws-modules/vpc/aws"
  version = "3.18.0"

  name = "my-vpc"
  cidr = "10.0.0.0/16"

  azs             = ["us-east-1a", "us-east-1b"]
  private_subnets = ["10.0.1.0/24", "10.0.2.0/24"]
  public_subnets  = ["10.0.101.0/24", "10.0.102.0/24"]

  enable_nat_gateway = true
  enable_vpn_gateway = true

  tags = {
    Terraform = "true"
    Environment = "dev"
  }
}
```

Refer to the exhibit. The configuration fails with an error indicating that the module does not support the 'enable_vpn_gateway' argument. 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.

Question 1easymultiple choice

Read the full VPN explanation →

Exhibit

Refer to the exhibit.

```hcl
module "vpc" {
  source  = "terraform-aws-modules/vpc/aws"
  version = "3.18.0"

  name = "my-vpc"
  cidr = "10.0.0.0/16"

  azs             = ["us-east-1a", "us-east-1b"]
  private_subnets = ["10.0.1.0/24", "10.0.2.0/24"]
  public_subnets  = ["10.0.101.0/24", "10.0.102.0/24"]

  enable_nat_gateway = true
  enable_vpn_gateway = true

  tags = {
    Terraform = "true"
    Environment = "dev"
  }
}
```

A
The argument name is misspelled; it should be 'enable_vpn' instead.
Why wrong: The argument is correctly spelled and exists in later versions.
B
The module version '3.18.0' does not include the 'enable_vpn_gateway' variable; it was added in a later version.
Pinning to an exact older version causes missing variable error.
C
The module does not support VPN gateways at all.
Why wrong: The module does support VPN gateways in recent versions.
D
The module source is incorrectly specified; it should use a git URL instead of the registry path.
Why wrong: The registry path is correct for this module.

Full breakdown with real-world context →

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

✓

The module version '3.18.0' does not include the 'enable_vpn_gateway' variable; it was added in a later version.

Option B is correct because the error message indicates that the module does not support the 'enable_vpn_gateway' argument. In Terraform, module arguments are defined by the module's published variables. The module version '3.18.0' predates the introduction of the 'enable_vpn_gateway' variable, which was added in a later version. Upgrading the module version to one that includes this variable resolves the error.

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.

✗
The argument name is misspelled; it should be 'enable_vpn' instead.
Why it's wrong here
The argument is correctly spelled and exists in later versions.
✓
The module version '3.18.0' does not include the 'enable_vpn_gateway' variable; it was added in a later version.
Why this is correct
Pinning to an exact older version causes missing variable error.
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 module does not support VPN gateways at all.
Why it's wrong here
The module does support VPN gateways in recent versions.
✗
The module source is incorrectly specified; it should use a git URL instead of the registry path.
Why it's wrong here
The registry path is correct for this module.

Common exam traps

Common exam trap: answer the scenario, not the keyword

HashiCorp often tests the concept that module arguments are version-dependent, and the trap here is that candidates may assume the argument name is misspelled or that the module lacks the feature entirely, rather than recognizing that the module version simply does not include that variable yet.

Detailed technical explanation

How to think about this question

Terraform modules from the public registry are versioned, and each version has a fixed set of input variables defined in its variables.tf file. The 'enable_vpn_gateway' argument corresponds to a variable that was introduced in a later release of the module, likely as part of a feature update to support VPN gateway creation. When a module version is pinned (e.g., 'version = "3.18.0"'), Terraform validates all provided arguments against that version's schema, and any unknown argument triggers an error. This is a common scenario when using modules with rapidly evolving features, such as those in the Terraform AWS provider ecosystem.

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.

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FAQ

Questions learners often ask

What does this TF-003 question test?

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: The module version '3.18.0' does not include the 'enable_vpn_gateway' variable; it was added in a later version. — Option B is correct because the error message indicates that the module does not support the 'enable_vpn_gateway' argument. In Terraform, module arguments are defined by the module's published variables. The module version '3.18.0' predates the introduction of the 'enable_vpn_gateway' variable, which was added in a later version. Upgrading the module version to one that includes this variable resolves the error.

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.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 30, 2026

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