The answer is Blob soft delete and Blob versioning. Blob soft delete protects against accidental deletion by retaining deleted blobs for a specified retention period, while versioning preserves previous states of a blob, allowing recovery from corruption or overwrites. Together, they create a comprehensive recovery solution for Azure Blob Storage, with the 30-day retention requirement met by configuring the soft delete policy accordingly. On the AZ-305 exam, this pairing tests your understanding of native Azure Storage data protection features versus alternatives like point-in-time restore for Azure Files or Azure Backup, which are separate services. A common trap is selecting change feed, which only tracks operations without enabling recovery, or Azure Backup, which is a broader solution not focused on per-blob versioning. Remember the mnemonic: "Delete and Date" — soft delete recovers deletions, versioning recovers dates (previous versions).
AZ-305 Design business continuity solutions Practice Question
This AZ-305 practice question tests your understanding of design business continuity solutions. 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 company wants to ensure that their Azure Storage account containing blobs is protected against accidental deletion or corruption. The solution must enable recovery of previous versions up to 30 days. Which TWO features should they enable? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Blob versioning
Options A and C are correct. Blob soft delete allows recovery of deleted blobs, and versioning keeps previous versions of blobs. Together, they provide protection against deletion and corruption with 30-day retention. Option B is wrong because point-in-time restore is for Azure Files. Option D is wrong because change feed tracks changes but does not enable recovery. Option E is wrong because Azure Backup for blobs is an alternative but not the combination requested.
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.
✓
Blob versioning
Why this is correct
Versioning preserves previous versions of blobs.
Related concept
Static NAT maps one inside address to one outside address.
✓
Blob soft delete
Why this is correct
Soft delete retains deleted blobs for a specified period.
Related concept
Static NAT maps one inside address to one outside address.
✗
Change feed
Why it's wrong here
Change feed logs changes but does not provide recovery.
✗
Azure Backup for Azure Blobs
Why it's wrong here
This is a separate feature, not the specific combination of soft delete and versioning.
✗
Point-in-time restore for Azure Files
Why it's wrong here
Point-in-time restore is for Azure Files, not blobs.
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 AZ-305 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 AZ-305 NAT questions on configuration and troubleshooting.
Design business continuity solutions — This question tests Design business continuity solutions — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Blob versioning — Options A and C are correct. Blob soft delete allows recovery of deleted blobs, and versioning keeps previous versions of blobs. Together, they provide protection against deletion and corruption with 30-day retention. Option B is wrong because point-in-time restore is for Azure Files. Option D is wrong because change feed tracks changes but does not enable recovery. Option E is wrong because Azure Backup for blobs is an alternative but not the combination requested.
What should I do if I get this AZ-305 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 AZ-305 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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