This TF-003 practice question tests your understanding of understand iac concepts. 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 characteristics are associated with immutable infrastructure as practiced by Terraform?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
New versions are deployed by creating new instances
Option A is correct because immutable infrastructure in Terraform involves deploying new versions by creating entirely new instances rather than modifying existing ones. This aligns with Terraform's resource lifecycle, where changes to certain attributes trigger destruction and recreation, ensuring a consistent and reproducible state.
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.
✓
New versions are deployed by creating new instances
Why this is correct
New instances are provisioned for each version.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configuration drift is accepted
Why it's wrong here
Immutable infrastructure combats drift by replacing resources.
✓
Rollbacks are performed by redeploying a previous version
Why this is correct
Redeploying an older image or configuration achieves rollback.
Related concept
Read the scenario before looking for a memorised answer.
✓
Resources are replaced rather than modified in place
Why this is correct
Immutable infrastructure avoids in-place changes.
Related concept
Read the scenario before looking for a memorised answer.
✗
In-place updates are preferred
Why it's wrong here
Immutable infrastructure avoids in-place updates.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse immutable infrastructure with mutable patterns, mistakenly thinking that in-place updates or accepting drift are acceptable, when Terraform's immutable model strictly replaces resources to enforce consistency.
Detailed technical explanation
How to think about this question
Under the hood, Terraform's `create_before_destroy` lifecycle rule exemplifies immutability: when a resource's configuration changes, Terraform first creates a new resource, then destroys the old one, ensuring zero downtime. This contrasts with mutable approaches where `lifecycle { create_before_destroy = false }` would allow in-place updates, but immutable patterns avoid that to maintain idempotency and prevent state drift. In real-world scenarios, this is critical for scaling in cloud environments like AWS Auto Scaling groups, where new AMI versions are deployed via new instances rather than patching existing ones.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Understand IaC concepts — This question tests Understand IaC concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: New versions are deployed by creating new instances — Option A is correct because immutable infrastructure in Terraform involves deploying new versions by creating entirely new instances rather than modifying existing ones. This aligns with Terraform's resource lifecycle, where changes to certain attributes trigger destruction and recreation, ensuring a consistent and reproducible state.
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.
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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