TF-003 Interact with Terraform modules Practice Question
This TF-003 practice question tests your understanding of interact with terraform modules. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
```
Terraform will perform the following actions:
# module.instances["web"].aws_instance.this will be created
+ resource "aws_instance" "this" {
+ ami = "ami-123456"
+ instance_type = "t2.micro"
+ subnet_id = (known after apply)
...
}
# module.instances["app"].aws_instance.this will be created
+ resource "aws_instance" "this" {
+ ami = "ami-789012"
+ instance_type = "t2.small"
+ subnet_id = (known after apply)
...
}
Plan: 2 to add, 0 to change, 0 to destroy.
```
Given the plan output, how is the module 'instances' configured in the root module?
Refer to the exhibit.
```
Terraform will perform the following actions:
# module.instances["web"].aws_instance.this will be created
+ resource "aws_instance" "this" {
+ ami = "ami-123456"
+ instance_type = "t2.micro"
+ subnet_id = (known after apply)
...
}
# module.instances["app"].aws_instance.this will be created
+ resource "aws_instance" "this" {
+ ami = "ami-789012"
+ instance_type = "t2.small"
+ subnet_id = (known after apply)
...
}
Plan: 2 to add, 0 to change, 0 to destroy.
```
A
The root module uses for_each in the module block with a map variable.
for_each on a module block creates multiple module instances, each keyed by the map keys, allowing different variable values per instance.
B
The module uses count with a list variable.
Why wrong: count would produce addresses like module.instances[0], not module.instances["web"].
C
The module is declared twice with different names.
Why wrong: If declared twice, addresses would be like module.instances and module.app, not instances["web"].
D
The module contains a resource with for_each inside.
Why wrong: The plan shows the module itself is expanded, not a resource inside; the module address includes brackets with keys.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The root module uses for_each in the module block with a map variable.
Option D is correct because for_each with a map creates one instance per key, and each instance can have different variables like ami and instance_type. Option A is wrong because count would show index numbers, not keys. Option B is wrong because using module multiple times would show different module addresses. Option C is wrong because a module with a single resource but for_each inside would still show one instance per key.
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 root module uses for_each in the module block with a map variable.
Why this is correct
for_each on a module block creates multiple module instances, each keyed by the map keys, allowing different variable values per instance.
Related concept
Read the scenario before looking for a memorised answer.
✗
The module uses count with a list variable.
Why it's wrong here
count would produce addresses like module.instances[0], not module.instances["web"].
✗
The module is declared twice with different names.
Why it's wrong here
If declared twice, addresses would be like module.instances and module.app, not instances["web"].
✗
The module contains a resource with for_each inside.
Why it's wrong here
The plan shows the module itself is expanded, not a resource inside; the module address includes brackets with keys.
Common exam traps
Common exam trap: answer the scenario, not the keyword
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.
Trap categories for this question
Command / output trap
The plan shows the module itself is expanded, not a resource inside; the module address includes brackets with keys.
Detailed technical explanation
How to think about this question
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.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 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
Got this wrong? Here's your next step.
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.
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 root module uses for_each in the module block with a map variable. — Option D is correct because for_each with a map creates one instance per key, and each instance can have different variables like ami and instance_type. Option A is wrong because count would show index numbers, not keys. Option B is wrong because using module multiple times would show different module addresses. Option C is wrong because a module with a single resource but for_each inside would still show one instance per key.
What should I do if I get this TF-003 question wrong?
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.
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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