TF-003 Use the core Terraform workflow Practice Question
This TF-003 practice question tests your understanding of use the core terraform workflow. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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
resource "aws_instance" "web" {
ami = "ami-0c55b159cbfafe1f0"
instance_type = "t2.micro"
}
```
An engineer runs `terraform apply` with this configuration and receives the following error:
```
Error: Error launching source instance: UnauthorizedOperation: You are not authorized to perform this operation.
```
What is the most likely cause of this error?
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.
Refer to the exhibit.
```hcl
resource "aws_instance" "web" {
ami = "ami-0c55b159cbfafe1f0"
instance_type = "t2.micro"
}
```
An engineer runs `terraform apply` with this configuration and receives the following error:
```
Error: Error launching source instance: UnauthorizedOperation: You are not authorized to perform this operation.
```
A
The AWS credentials used do not have permission to launch EC2 instances.
UnauthorizedOperation error indicates lack of permissions.
B
The Terraform configuration has a syntax error.
Why wrong: The error is from AWS, not a syntax error.
C
The instance type 't2.micro' is not available in the region.
Why wrong: The error is not about instance type availability.
D
The AMI ID is invalid or does not exist in the region.
Why wrong: The error is about authorization, not AMI existence.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The AWS credentials used do not have permission to launch EC2 instances.
The error is most likely caused by insufficient AWS permissions because Terraform uses the configured AWS credentials to make API calls. If the IAM user or role lacks the `ec2:RunInstances` permission, the API will return an authorization error, even if the configuration is syntactically correct and the AMI/instance type are valid.
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 AWS credentials used do not have permission to launch EC2 instances.
Why this is correct
UnauthorizedOperation error indicates lack of permissions.
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 Terraform configuration has a syntax error.
Why it's wrong here
The error is from AWS, not a syntax error.
✗
The instance type 't2.micro' is not available in the region.
Why it's wrong here
The error is not about instance type availability.
✗
The AMI ID is invalid or does not exist in the region.
Why it's wrong here
The error is about authorization, not AMI existence.
Common exam traps
Common exam trap: answer the scenario, not the keyword
HashiCorp often tests the distinction between API authorization errors (HTTP 403) and resource validation errors (HTTP 400), leading candidates to confuse permission issues with configuration mistakes like invalid AMIs or unavailable instance types.
Detailed technical explanation
How to think about this question
Under the hood, Terraform's AWS provider calls the EC2 `RunInstances` API via an HTTP POST request signed with the configured credentials. The API first checks IAM policy permissions before validating parameters like AMI ID or instance type. A common real-world scenario is using a read-only IAM policy that allows `Describe*` actions but denies `RunInstances`, causing a failure only at apply time.
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 junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
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.
Use the core Terraform workflow — This question tests Use the core Terraform workflow — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The AWS credentials used do not have permission to launch EC2 instances. — The error is most likely caused by insufficient AWS permissions because Terraform uses the configured AWS credentials to make API calls. If the IAM user or role lacks the `ec2:RunInstances` permission, the API will return an authorization error, even if the configuration is syntactically correct and the AMI/instance type are valid.
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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Question Discussion
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