The correct answer is that the instance will be modified in-place, potentially causing a reboot. This is because the tilde (~) symbol in the Terraform plan output specifically indicates an in-place update, meaning the resource is changed without being destroyed and recreated; changing an AWS instance type requires a stop and start, which triggers a reboot but avoids a full destroy and recreate cycle. On the HashiCorp Terraform Associate TF-003 exam, this tests your ability to read plan output symbols: the tilde (~) for in-place updates versus the -/+ for forced recreation, a common trap where candidates confuse a reboot with a full destroy. Remember the memory tip: “Tilde means tweak, not tear down”—if you see the squiggly line, expect an update that may cause a brief restart, but the resource stays alive.
TF-003 Read, generate and modify configuration Practice Question
This TF-003 practice question tests your understanding of read, generate and modify configuration. 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.
```
$ terraform plan
...
# aws_instance.example will be updated in-place
~ resource "aws_instance" "example" {
id = "i-0abcd1234"
~ instance_type = "t2.micro" -> "t2.small"
tags = {
"Name" = "example"
}
}
```
What will happen when this configuration is applied?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The instance will be modified in-place, potentially causing a reboot.
Option C is correct because the tilde (~) indicates an in-place update. Changing the instance type on AWS requires a stop/start, which results in a reboot but not a full destroy and recreate. Option A is incorrect because the plan shows an update, not a destroy/recreate (which would show -/+). Option B is incorrect because changing instance type typically requires a reboot, causing downtime. Option D is incorrect because the plan does not indicate any missing variables.
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 plan will fail due to missing variables.
Why it's wrong here
The plan completed successfully; no missing variables are indicated.
✗
The instance will be destroyed and recreated.
Why it's wrong here
The plan shows an in-place update (~), not destroy/recreate (-/+).
✓
The instance will be modified in-place, potentially causing a reboot.
Why this is correct
The tilde (~) signals an in-place update; changing instance type triggers a stop/start, which may involve a reboot.
Related concept
Read the scenario before looking for a memorised answer.
✗
The instance type will be changed without downtime.
Why it's wrong here
Changing instance type on AWS requires a stop/start, causing a brief reboot and downtime.
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 an in-place update (~), not destroy/recreate (-/+).
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: The instance will be modified in-place, potentially causing a reboot. — Option C is correct because the tilde (~) indicates an in-place update. Changing the instance type on AWS requires a stop/start, which results in a reboot but not a full destroy and recreate. Option A is incorrect because the plan shows an update, not a destroy/recreate (which would show -/+). Option B is incorrect because changing instance type typically requires a reboot, causing downtime. Option D is incorrect because the plan does not indicate any missing variables.
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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