The answer is to configure the storage firewall to allow access only from specific virtual networks and to deny access from the internet. These two actions directly prevent data exfiltration from Azure Data Lake Storage Gen2 by ensuring that only traffic originating from your trusted Azure virtual networks can reach the storage account, effectively blocking all unauthorized external IP addresses. On the DP-203 exam, this scenario tests your understanding of network security controls for data lakes, often appearing as a trap where candidates confuse Azure Firewall (a separate network appliance) with the storage account’s built-in firewall settings. A common mistake is selecting geo-redundant storage or shared access signatures, but those address durability or granular access, not exfiltration prevention. Remember the memory tip: “Lock the lake with VNets, not with SAS or GRS.”
DP-203 Practice Question: Secure, monitor, and optimize data storage and data processing
This DP-203 practice question tests your understanding of secure, monitor, and optimize data storage and data processing. 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.
You have an Azure Data Lake Storage Gen2 account that stores sensitive customer data. You need to prevent data exfiltration to unauthorized external IP addresses. Which TWO actions should you take?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use private endpoints for the storage account
Network security controls: enabling firewall and deny access from internet, plus configuring service endpoints or private endpoints. Option A (Azure Firewall) is not a storage setting. Option D (Geo-redundant storage) is for durability, not security. Option E (Shared access signatures) is for fine-grained access but not prevent exfiltration.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 private endpoints for the storage account
Why this is correct
Access over private IP, preventing exposure to public internet.
Related concept
Static NAT maps one inside address to one outside address.
✗
Enable Azure Firewall on the storage account
Why it's wrong here
Storage account has its own firewall; Azure Firewall is for network.
✗
Use shared access signatures (SAS) with limited permissions
Why it's wrong here
SAS can allow access, not prevent exfiltration.
✓
Configure storage firewall to allow only specific virtual networks
Why this is correct
Limits access to trusted networks.
Related concept
Static NAT maps one inside address to one outside address.
✗
Enable geo-redundant storage (GRS)
Why it's wrong here
For data durability, not security.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this DP-203 question in full detail.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DP-203 NAT questions on configuration and troubleshooting.
Secure, monitor, and optimize data storage and data processing — This question tests Secure, monitor, and optimize data storage and data processing — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Use private endpoints for the storage account — Network security controls: enabling firewall and deny access from internet, plus configuring service endpoints or private endpoints. Option A (Azure Firewall) is not a storage setting. Option D (Geo-redundant storage) is for durability, not security. Option E (Shared access signatures) is for fine-grained access but not prevent exfiltration.
What should I do if I get this DP-203 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DP-203 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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