The answer is to implement shared access signatures (SAS) and token-based authentication on the Azure CDN. This is correct because SAS tokens grant time-limited, permission-specific access to blob storage, and when combined with Azure CDN’s token authentication feature, they ensure that only authorized users with a valid token can retrieve video files, even as the CDN caches content at edge locations globally. On the Microsoft Azure Data Fundamentals DP-900 exam, this scenario tests your understanding of how to secure storage access for global distribution without exposing data publicly—a common trap is confusing Azure AD authentication with CDN token auth, but Azure AD is not directly supported for CDN blob access. Remember the memory tip: “SAS + CDN token = global security without public exposure.”
DP-900 Practice Question: Describe considerations for working with non-relational data on Azure
This DP-900 practice question tests your understanding of describe considerations for working with non-relational data on azure. 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.
A media company stores video files in Azure Blob Storage. They want to use Azure Content Delivery Network (CDN) to serve these videos globally. However, they need to restrict access to only authorized users. What should you implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement shared access signatures (SAS) and token-based authentication on the CDN.
Azure CDN with token authentication (using shared access signatures or custom tokens) can restrict access to authorized users. Option A is wrong because public access would allow anyone. Option B is wrong because network restrictions don't work well for global users. Option C is wrong because Azure AD authentication is not directly supported by CDN for blob access; token auth is the standard approach.
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.
✗
Set the blob container to public access.
Why it's wrong here
Public access would allow anyone to access the videos.
✗
Use Azure Active Directory (Microsoft Entra ID) authentication for the CDN endpoint.
Why it's wrong here
CDN does not natively support Azure AD authentication for blob access.
✓
Implement shared access signatures (SAS) and token-based authentication on the CDN.
Why this is correct
SAS tokens or CDN token authentication can restrict access to authorized users.
Related concept
Static NAT maps one inside address to one outside address.
✗
Use a firewall on the storage account to allow only CDN IP addresses.
Why it's wrong here
CDN IP ranges change and this is not a scalable solution for user authorization.
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-900 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-900 NAT questions on configuration and troubleshooting.
Describe considerations for working with non-relational data on Azure — This question tests Describe considerations for working with non-relational data on Azure — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Implement shared access signatures (SAS) and token-based authentication on the CDN. — Azure CDN with token authentication (using shared access signatures or custom tokens) can restrict access to authorized users. Option A is wrong because public access would allow anyone. Option B is wrong because network restrictions don't work well for global users. Option C is wrong because Azure AD authentication is not directly supported by CDN for blob access; token auth is the standard approach.
What should I do if I get this DP-900 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-900 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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