The answer is that the Self-Hosted IR cannot reach the Oracle database due to a network firewall blocking the on-premises database. This is the most likely cause because the Self-Hosted Integration Runtime (SHIR) acts as a bridge between Azure and your local network; while it only requires outbound connectivity to Azure services, it must have direct network access to the on-premises data source itself. If a firewall rule on the corporate network or the database server blocks inbound traffic from the SHIR machine, the copy operation will fail with a connectivity error, even if the SHIR agent is running and Azure-bound traffic is allowed. On the Microsoft Azure Data Engineer Associate DP-203 exam, this scenario tests your understanding of SHIR’s hybrid networking model—specifically that the runtime initiates connections to both Azure and the local database, so the bottleneck is often the on-premises firewall, not Azure. A common trap is assuming the SHIR needs inbound ports open, but it only uses outbound to Azure. Memory tip: SHIR reaches out to Azure, but it must also reach into your database—think “outbound to cloud, inbound to data.”
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. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 Factory pipeline that uses a Self-Hosted Integration Runtime (SHIR) to copy data from an on-premises Oracle database to Azure Blob Storage. The pipeline is failing with a connectivity error. You have verified that the SHIR is running and the network firewall allows outbound traffic to Azure. What is the most likely cause of the failure?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The SHIR cannot reach the Oracle database due to a network firewall.
Option D is correct because the SHIR needs network access to the on-premises database; if the database is not reachable due to firewall or network configuration, it will fail. Option A is wrong because SHIR does not require inbound ports. Option B is wrong because SHIR uses outbound to Azure, but the error is connectivity to on-premises. Option C is wrong because SHIR does not require Azure Key Vault for basic connectivity.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The SHIR is not registered with Azure Data Factory.
Why it's wrong here
If it were not registered, the pipeline would not even start.
✓
The SHIR cannot reach the Oracle database due to a network firewall.
Why this is correct
The SHIR must have network access to the on-premises database.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The SHIR requires inbound port 443 from Azure to on-premises.
Why it's wrong here
SHIR uses outbound connections, not inbound.
✗
The SHIR does not have access to Azure Key Vault.
Why it's wrong here
Key Vault is not required for basic connectivity.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DP-203 ACL questions on filtering logic and placement.
Secure, monitor, and optimize data storage and data processing — This question tests Secure, monitor, and optimize data storage and data processing — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The SHIR cannot reach the Oracle database due to a network firewall. — Option D is correct because the SHIR needs network access to the on-premises database; if the database is not reachable due to firewall or network configuration, it will fail. Option A is wrong because SHIR does not require inbound ports. Option B is wrong because SHIR uses outbound to Azure, but the error is connectivity to on-premises. Option C is wrong because SHIR does not require Azure Key Vault for basic connectivity.
What should I do if I get this DP-203 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DP-203 ACL questions on filtering logic and placement.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Standard ACLs match source addresses.
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