The correct answer is to mark the variable as `sensitive = true` in the variable definition. This setting instructs Terraform to mask the variable’s value in plan output, logs, and console display, preventing exposure of secrets like API keys or passwords. On the HashiCorp Terraform Associate TF-003 exam, this concept tests your understanding of how to protect sensitive data across workspaces without relying on external tools or state file encryption. A common trap is assuming that environment variables or data sources automatically hide values—they do not, unless explicitly marked sensitive. Remember the mnemonic: “Sensitive in the block, secrets stay locked.” This ensures that even when running `terraform plan` for a prod workspace, the output shows `<sensitive>` instead of the actual value.
TF-003 Understand Terraform basics Practice Question
This TF-003 practice question tests your understanding of understand terraform basics. 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.
An organization uses Terraform with multiple workspaces to manage different environments (dev, staging, prod). They want to ensure that sensitive variables for prod are not exposed in the plan output. What should they do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Mark the variable as `sensitive = true` in the variable definition
Option C is correct because marking a variable as `sensitive = true` in the variable definition will mask its value in logs and plan output. Option A is wrong because output blocks are for exposing values, not hiding. Option B is wrong because environment variables are still visible in plan if not marked sensitive. Option D is wrong because data sources can read secrets but do not automatically mask. Option E is wrong because state files can contain plaintext.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Mark the variable as `sensitive = true` in the variable definition
Why this is correct
Correct: Sensitive flag hides the value from output.
Use an output block to display the variable only when needed
Why it's wrong here
Outputs expose values by design.
✗
Store the variable in the state file
Why it's wrong here
State files can contain secrets in plaintext.
✗
Store the variable in an environment variable instead of a .tfvars file
Why it's wrong here
Environment variables are still printed unless marked sensitive.
✗
Use a data source to retrieve the secret at runtime
Why it's wrong here
Data sources do not automatically mask values.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Trap categories for this question
Command / output trap
Outputs expose values by design.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related TF-003 subnetting questions on CIDR, address ranges, and subnet selection.
Understand Terraform basics — This question tests Understand Terraform basics — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Mark the variable as `sensitive = true` in the variable definition — Option C is correct because marking a variable as `sensitive = true` in the variable definition will mask its value in logs and plan output. Option A is wrong because output blocks are for exposing values, not hiding. Option B is wrong because environment variables are still visible in plan if not marked sensitive. Option D is wrong because data sources can read secrets but do not automatically mask. Option E is wrong because state files can contain plaintext.
What should I do if I get this TF-003 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related TF-003 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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