VA-003 Explain encryption as a service Practice Question
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.
An organization wants to encrypt sensitive fields in their database using Vault. They have multiple applications that need to encrypt different types of data. What approach should they take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a separate transit key per application
Option C is correct because the Vault Transit Secrets Engine provides encryption-as-a-service, allowing each application to have its own named encryption key. This ensures cryptographic isolation: if one key is compromised, only the data encrypted with that specific key is at risk. Using separate keys per application also simplifies key rotation and access control, as each application can only use its designated key.
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.
✗
Use the PKI engine to issue certificates for each application
KV stores secrets but does not provide encryption/decryption operations.
✓
Create a separate transit key per application
Why this is correct
Isolates encryption domains; follows least privilege principle.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a single key for all applications to simplify management
Why it's wrong here
If a single key is compromised, all data is at risk.
✗
Encrypt data in the database using a static key stored in Vault
Why it's wrong here
This bypasses Vault's encryption service and is less secure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
HashiCorp often tests the distinction between secret storage (KV engine) and encryption-as-a-service (Transit engine), leading candidates to incorrectly choose Option B because they confuse storing keys with performing encryption operations.
Detailed technical explanation
How to think about this question
The Transit Secrets Engine uses envelope encryption: a data encryption key (DEK) encrypts the plaintext, and the DEK itself is encrypted by a key encryption key (KEK) managed by Vault. This allows Vault to perform encryption/decryption without exposing the raw key material to clients. In a real-world scenario, separate transit keys enable fine-grained audit logging via Vault's audit device, showing exactly which application encrypted or decrypted which data, which is critical for compliance with regulations like PCI DSS or HIPAA.
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 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
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.
Explain encryption as a service — This question tests Explain encryption as a service — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a separate transit key per application — Option C is correct because the Vault Transit Secrets Engine provides encryption-as-a-service, allowing each application to have its own named encryption key. This ensures cryptographic isolation: if one key is compromised, only the data encrypted with that specific key is at risk. Using separate keys per application also simplifies key rotation and access control, as each application can only use its designated key.
What should I do if I get this VA-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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