TF-004 Module Outputs Practice Question
Which THREE of the following are valid ways to reference a module output value within the same Terraform configuration?
⚠ Common exam trap
Module outputs are valid in resource arguments, count/for_each, data source filter blocks, and locals blocks. They cannot be used in provider blocks because provider configurations are static and resolved before any other resources are evaluated.
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
✓
In the count or for_each of another module or resource.
Options A, B, C, and E are correct ways to reference a module output value within the same Terraform configuration. Module outputs can be used in `count` or `for_each` meta-arguments (A), directly in resource arguments (B), in data source filter blocks (C), and in `locals` blocks for transformation (E). Option D is incorrect because provider blocks require static configuration and cannot reference module outputs; provider configurations are resolved before any resources or modules.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
In the count or for_each of another module or resource.
Why this is correct
Module outputs can control the number of instances or the iteration set of other resources.
- ✓
In a resource argument, e.g., subnet_id = module.vpc.public_subnet_ids
Why this is correct
Directly using module outputs in resource arguments is the most common use case.
- ✓
In a data source definition as a filter.
Why this is correct
Correct. Module output values can be used in data source filter blocks, such as `filter { name = "tag:Name" values = [module.vpc.name] }`. Terraform handles the dependency graph, so this is valid.
- ✗
In a provider block to set endpoints.
Why it's wrong here
Provider configurations are static and cannot reference interpolations from module outputs.
- ✓
In a locals block to perform transformations.
Why this is correct
Locals can use module outputs to derive new local values.
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