Quick Answer
The answer is to enable infrastructure encryption (double encryption) using platform-managed keys. This adds a second, independent layer of encryption at the Azure Storage infrastructure level, operating below Transparent Data Encryption (TDE) to protect the physical storage files themselves. Even if an attacker gains direct access to the underlying storage blobs, this separate platform-managed key renders the data unreadable, fulfilling the defense-in-depth requirement for physical storage protection. On the DP-300 exam, this scenario tests your understanding of layered encryption controls beyond TDE and firewalls; a common trap is confusing this with Always Encrypted, which protects data in use and in transit, not at the physical storage layer. Remember the memory tip: “TDE for the database, infrastructure encryption for the disk.”
This DP-300 practice question tests your understanding of implement a secure environment. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Your organization uses Azure SQL Database and wants to implement a defense-in-depth strategy. You have already enabled Transparent Data Encryption (TDE) and firewall rules. You need to add an additional layer of security that protects against unauthorized access to the physical storage files (e.g., if someone gains access to the storage account). What should you enable?
Infrastructure encryption (double encryption) using platform-managed keys
Adds a second layer of encryption at the storage infrastructure level.
Dynamic Data Masking
Why wrong: Does not encrypt data.
Microsoft Defender for SQL
Why wrong: Threat detection, not encryption.
Always Encrypted with secure enclaves
Why wrong: Protects data in use, not storage-level encryption.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Infrastructure encryption (double encryption) using platform-managed keys
Infrastructure encryption (double encryption) using platform-managed keys adds a second layer of encryption at the storage infrastructure level, below the TDE layer. This protects data at rest even if the physical storage files (e.g., Azure Storage blobs) are accessed directly, because the storage infrastructure itself is encrypted with a separate, platform-managed key. This fulfills the defense-in-depth requirement for protecting against unauthorized access to physical storage.
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.
Infrastructure encryption (double encryption) using platform-managed keys
Why this is correct
Adds a second layer of encryption at the storage infrastructure level.
Related concept
Read the scenario before looking for a memorised answer.
Dynamic Data Masking
Why it's wrong here
Does not encrypt data.
Microsoft Defender for SQL
Why it's wrong here
Threat detection, not encryption.
Always Encrypted with secure enclaves
Why it's wrong here
Protects data in use, not storage-level encryption.
Common exam traps
The trap here is that candidates often confuse TDE with infrastructure encryption, assuming TDE alone protects against physical storage access, but TDE only encrypts database pages, not the underlying storage infrastructure, which is why double encryption is needed for defense-in-depth.
Detailed technical explanation
Infrastructure encryption uses Azure Storage Service Encryption (SSE) with a separate, platform-managed key that encrypts the storage infrastructure itself, including the disks and the underlying storage nodes. This is enabled at the logical server level in Azure SQL Database and is independent of TDE, which encrypts the database files at the page level. In a real-world scenario, if an attacker gains access to the Azure Storage account hosting the database files, double encryption ensures the data remains unreadable even if the TDE key is compromised.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
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FAQ
Implement a secure environment — This question tests Implement a secure environment — Read the scenario before looking for a memorised answer..
The correct answer is: Infrastructure encryption (double encryption) using platform-managed keys — Infrastructure encryption (double encryption) using platform-managed keys adds a second layer of encryption at the storage infrastructure level, below the TDE layer. This protects data at rest even if the physical storage files (e.g., Azure Storage blobs) are accessed directly, because the storage infrastructure itself is encrypted with a separate, platform-managed key. This fulfills the defense-in-depth requirement for protecting against unauthorized access to physical storage.
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 24, 2026
This DP-300 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DP-300 exam.
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