TF-004 Practice Test 6 — 10 Questions

Question 1

A developer creates a directory structure with a module located at './modules/networking'. The root configuration references it with source = './modules/networking'. What is the behavior when running terraform init from the root directory?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

Terraform uses the module directly from the local filesystem.. When a module source is a relative path like './modules/networking', Terraform interprets it as a local filesystem path. During `terraform init`, Terraform reads the module directly from the specified directory without any network access, downloading, or registry interaction. This is the standard behavior for local module references in Terraform.

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Terraform requires a network connection to verify the module.

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Terraform attempts to download the module from the public registry.

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Terraform returns an error because the module path is not absolute.

Question 2

After running terraform apply, you see the error: 'Error: Error loading state: state snapshot was created by Terraform v0.12.0, but this is Terraform v1.2.0'. What should you do to resolve this?

Accepted Answer

Run terraform apply with no changes to upgrade the state format. Running `terraform apply` with no changes triggers Terraform to automatically upgrade the state file format to the version compatible with the current Terraform binary (v1.2.0). Terraform state files are versioned internally, and when a newer version of Terraform reads an older state format, it performs an in-place upgrade during the next state write operation, such as an apply that results in no changes. This avoids manual intervention or data loss.

Answer

Run terraform state upgrade

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Delete the state file and reimport resources

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Downgrade Terraform to v0.12.0

Question 3

A team is using Terraform workspaces to manage multiple environments with a single configuration. They store state in an S3 backend. Which statement about Terraform workspaces is true?

Accepted Answer

The default workspace is named "default" and cannot be deleted. The default workspace in Terraform is always named 'default' and cannot be deleted. This workspace is created automatically when you initialize a configuration, and it serves as the baseline workspace for state management. The S3 backend fully supports workspaces, and each workspace stores its state under a separate path in the S3 bucket, enabling environment isolation without changing the configuration.

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There is a limit of 10 workspaces per configuration

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Workspaces can only be used with the local backend

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Workspaces automatically isolate variable values and provider configurations

Question 4

A DevOps engineer is writing a Terraform configuration to provision an AWS EC2 instance. They want to ensure that the instance is replaced if the AMI ID changes, but not if the instance type changes. Which lifecycle meta-argument should be used?

Accepted Answer

Set `create_before_destroy = true` and add `instance_type` to `ignore_changes`. `create_before_destroy = true` ensures the new instance is created before the old one is destroyed, which is a best practice for zero-downtime deployments when the AMI changes. Adding `instance_type` to `ignore_changes` tells Terraform to ignore changes to the instance type attribute during plan/apply, so the instance is not replaced when only the instance type changes. This combination precisely meets the requirement: replacement on AMI change, no replacement on instance type change.

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Set `prevent_destroy = true`

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Set `ignore_changes = all`

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Set `create_before_destroy = true` only

Question 5

An organization uses Terraform Cloud for remote state management. A user runs `terraform apply` locally but receives an error that the state is locked. What is the most likely cause?

Accepted Answer

Another user or process is currently running a Terraform operation that modifies the same state.. Terraform Cloud uses a state locking mechanism to prevent concurrent modifications that could corrupt the state file. When a user runs `terraform apply` locally, the command first attempts to acquire a lock on the remote state. If another user or process (e.g., a Terraform Cloud run, a CI/CD pipeline, or another local apply) is already holding that lock, the new operation will fail with a 'state is locked' error. This is a fundamental safety feature to ensure state consistency.

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The Terraform configuration has a syntax error.

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The user does not have access to the remote state backend.

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The remote backend is temporarily unavailable.

Question 6

Refer to the exhibit. An engineer runs 'terraform plan' and receives an error: 'Error refreshing state: state data in S3 does not have the expected content.' The state file exists and is not corrupted. What is the most likely cause?

Accepted Answer

The state file was written by a different backend configuration (e.g., different key or workspace).. The error 'state data in S3 does not have the expected content' indicates a mismatch between the state file's content and what Terraform expects based on the current backend configuration. This typically occurs when the state file was written using a different backend key, workspace, or bucket path, causing Terraform to read a state that does not match the expected serial or lineage. The state file itself is not corrupted, but the backend configuration (e.g., different `key` or `workspace_key_prefix`) points to a different state object in S3.

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The state file is locked by another process.

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The DynamoDB table does not exist.

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The S3 bucket is in a different region.

Question 7

An operator runs terraform apply and receives the exhibit error. The instance was created but Terraform reports a failure. What is the most likely cause?

Accepted Answer

A provisioner block is configured to wait for SSH, but the instance is not reachable. The error indicates that the instance was created successfully but Terraform reports a failure during the apply phase. This typically occurs when a provisioner block (e.g., file or remote-exec) is configured to wait for SSH connectivity, but the instance is not reachable within the timeout period. Terraform marks the resource as 'tainted' and reports a failure, even though the cloud resource itself was provisioned.

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The state file is locked and cannot be updated

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The AMI ID is incorrect and the instance failed to boot

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The AWS API returned an error during instance creation

Question 8

An organization stores their Terraform modules in a private Git repository. They need to reference a module that resides in a subdirectory called 'modules/rds' within the repository 'infra-modules' on the main branch. Which source argument should be used?

Accepted Answer

source = "git::https://github.com/org/infra-modules.git//modules/rds". Terraform's module source syntax for Git repositories uses a double slash (`//`) to specify a subdirectory within the repository. The format `git::https://github.com/org/infra-modules.git//modules/rds` tells Terraform to clone the repository at the main branch and then use the module located in the `modules/rds` subdirectory. This is the standard way to reference a module in a subdirectory of a Git repository.

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source = "git::https://github.com/org/infra-modules.git"

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source = "git::https://github.com/org/infra-modules.git:modules/rds"

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source = "git::https://github.com/org/infra-modules.git//rds"

Question 9

Drag and drop the steps to initialize a Terraform working directory in the correct order.

Accepted Answer

Write Terraform configuration files, then run terraform init, then run terraform validate.. Initialization begins after writing configs; terraform init downloads providers/modules, creates .terraform directory, and validate checks syntax.

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Run terraform init, then write Terraform configuration files, then run terraform validate.

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Write Terraform configuration files, then run terraform validate, then run terraform init.

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Run terraform validate, then write Terraform configuration files, then run terraform init.

Question 10

A DevOps team is using Terraform Cloud to manage infrastructure. They want to integrate Terraform into their CI/CD pipeline by triggering runs programmatically. Which approach should they use to invoke a Terraform run from an external system?

Accepted Answer

Use the Terraform Cloud API to trigger a run.. The Terraform Cloud API provides a programmatic endpoint to trigger runs, allowing external CI/CD systems to initiate Terraform operations without manual intervention. This is the correct approach because it directly invokes a run with full control over variables, configuration versions, and apply strategies, aligning with the requirement to integrate Terraform into a CI/CD pipeline programmatically.

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Set up a webhook from the VCS provider to trigger runs.

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Configure a remote backend to automatically run apply.

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Execute 'terraform apply -auto-approve' in the CI pipeline.