This VA-003 practice question tests your understanding of explain encryption as a service. 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 Vault API path is used to encrypt data with the transit engine?
/v1/transit/enc/
Why wrong: Path uses 'enc' instead of 'encrypt'.
/v1/transit/encrypt/
Why wrong: Missing keyname in path.
/v1/transit/encrypt/{keyname}
This is the standard endpoint for transit encryption.
/v1/transit/encryption/
Why wrong: Uses 'encryption' instead of 'encrypt'.
/v1/transit/encryption/{keyname}
Why wrong: Uses 'encryption' instead of 'encrypt'.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
/v1/transit/encrypt/{keyname}
Option C is correct because the Vault transit engine uses the exact path `/v1/transit/encrypt/{keyname}` to encrypt plaintext data. The `{keyname}` parameter specifies the named encryption key stored in the transit engine, and the API endpoint expects a POST request with the plaintext base64-encoded in the request body. This path aligns with Vault's RESTful design where the action (`encrypt`) is a sub-path under the transit mount, and the key name is a required path parameter.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
/v1/transit/enc/
Why it's wrong here
Path uses 'enc' instead of 'encrypt'.
/v1/transit/encrypt/
Why it's wrong here
Missing keyname in path.
/v1/transit/encrypt/{keyname}
Why this is correct
This is the standard endpoint for transit encryption.
Related concept
Read the scenario before looking for a memorised answer.
/v1/transit/encryption/
Why it's wrong here
Uses 'encryption' instead of 'encrypt'.
/v1/transit/encryption/{keyname}
Why it's wrong here
Uses 'encryption' instead of 'encrypt'.
Common exam traps
HashiCorp often tests the exact API path syntax, and the trap here is that candidates confuse the action verb 'encrypt' with the noun 'encryption' or use abbreviations, leading them to pick options like D or E that sound correct but use the wrong word.
Detailed technical explanation
Under the hood, the transit engine's encrypt endpoint performs symmetric encryption using a key stored in Vault's backend (e.g., AES-GCM by default). The key name in the path references a keyring that can support key rotation, and the API returns a ciphertext string that includes the key version and context metadata. In a real-world scenario, an application would call this endpoint to encrypt sensitive data (e.g., credit card numbers) without ever exposing the encryption key to the application, enabling centralized key management and rotation.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
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FAQ
Explain encryption as a service — This question tests Explain encryption as a service — Read the scenario before looking for a memorised answer..
The correct answer is: /v1/transit/encrypt/{keyname} — Option C is correct because the Vault transit engine uses the exact path `/v1/transit/encrypt/{keyname}` to encrypt plaintext data. The `{keyname}` parameter specifies the named encryption key stored in the transit engine, and the API endpoint expects a POST request with the plaintext base64-encoded in the request body. This path aligns with Vault's RESTful design where the action (`encrypt`) is a sub-path under the transit mount, and the key name is a required path parameter.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
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