The correct answer is that variable "region" { type = string default = "us-east-1" } is valid, along with two other declarations that match their type and default values. This is because Terraform enforces strict type consistency: the default value must match the declared type exactly, so a string default for a number type or a string default for a list type will cause a validation error. On the HashiCorp Terraform Associate TF-003 exam, this question tests your understanding of variable block syntax and type constraints, often appearing as a multiple-select trap where candidates overlook mismatched defaults. A common pitfall is assuming Terraform will coerce types, but it does not—every default must be a literal of the declared type. For a quick memory tip, remember the phrase "type and default must be twins": if you declare a number, the default must be a number, not a quoted string; if you declare a list, the default must be in list brackets, not quotes.
TF-003 Read, generate and modify configuration Practice Question
This TF-003 practice question tests your understanding of read, generate and modify configuration. 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.
Which THREE variable declarations are valid in Terraform?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
variable "enabled" { type = bool default = true }
A, B, D are valid. C is invalid because default is a string for number type. E is invalid because default is a string for list type.
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.
✓
variable "enabled" { type = bool default = true }
Why this is correct
Valid: bool type with bool default.
Related concept
Read the scenario before looking for a memorised answer.
✓
variable "tags" { type = map(string) default = {} }
Why this is correct
Valid: map type with map default.
Related concept
Read the scenario before looking for a memorised answer.
✓
variable "region" { type = string default = "us-east-1" }
Why this is correct
Valid: string type with string default.
Related concept
Read the scenario before looking for a memorised answer.
✗
variable "names" { type = list(string) default = "name" }
Why it's wrong here
Invalid: default is string but type is list.
✗
variable "count" { type = number default = "1" }
Why it's wrong here
Invalid: default is string but type is number.
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.
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.
Read, generate and modify configuration — This question tests Read, generate and modify configuration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: variable "enabled" { type = bool default = true } — A, B, D are valid. C is invalid because default is a string for number type. E is invalid because default is a string for list type.
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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