- A
Use a Sliding window of length 1 minute, set out-of-order policy to 10 seconds, and use 'At least once' output mode.
Why wrong: Sliding window is for incremental counts, not fixed intervals; 'At least once' may cause duplicates.
- B
Use a Session window with timeout of 1 minute and maximum duration of 10 seconds, set late arrival to 10 seconds, and use 'Exactly once' output mode.
Why wrong: Session windows group events by inactivity gaps, not fixed time intervals.
- C
Use a Hopping window of size 1 minute and hop 1 minute, set late arrival policy to 10 seconds, and use 'Exactly Once' output mode.
Why wrong: Hopping window with hop equal to size is effectively a Tumbling window, but the late arrival handling may still be correct; however, the exact-once semantics require the output to support it; Azure Synapse Analytics does support it with `Exactly once` option.
- D
Use a Tumbling window of size 1 minute, set late arrival policy to 10 seconds, and configure output to Azure Synapse Analytics with `Exactly once` semantics.
Tumbling window aligns with fixed intervals; late arrival policy handles out-of-order events; Azure Synapse Analytics supports exactly-once with proper configuration.
DP-203 Develop data processing Practice Question
This DP-203 practice question tests your understanding of develop data processing. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 company is building a real-time dashboard for monitoring website traffic. The data is ingested from web servers into Azure Event Hubs. You need to design a stream processing solution using Azure Stream Analytics that computes the number of unique visitors per minute, per country, and outputs the results to Azure Synapse Analytics for reporting. The solution must handle out-of-order events with a maximum late arrival of 10 seconds. You also need to ensure exactly-once semantics for the output. Which combination of settings should you use?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use a Tumbling window of size 1 minute, set late arrival policy to 10 seconds, and configure output to Azure Synapse Analytics with `Exactly once` semantics.
Option D is correct because a Tumbling window counts events per minute, and the late arrival policy with a 10-second window handles out-of-order events. Exactly-once semantics require that output format is Delta Lake or similar with Idempotent writes; however, Azure Synapse Analytics supports exactly-once with appropriate configuration. Option A is wrong because Hopping windows are for overlapping windows. Option B is wrong because Sliding windows are for point-in-time counts. Option C is wrong because Session windows are for periods of inactivity.
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 a Sliding window of length 1 minute, set out-of-order policy to 10 seconds, and use 'At least once' output mode.
Why it's wrong here
Sliding window is for incremental counts, not fixed intervals; 'At least once' may cause duplicates.
- ✗
Use a Session window with timeout of 1 minute and maximum duration of 10 seconds, set late arrival to 10 seconds, and use 'Exactly once' output mode.
Why it's wrong here
Session windows group events by inactivity gaps, not fixed time intervals.
- ✗
Use a Hopping window of size 1 minute and hop 1 minute, set late arrival policy to 10 seconds, and use 'Exactly Once' output mode.
Why it's wrong here
Hopping window with hop equal to size is effectively a Tumbling window, but the late arrival handling may still be correct; however, the exact-once semantics require the output to support it; Azure Synapse Analytics does support it with `Exactly once` option.
- ✓
Use a Tumbling window of size 1 minute, set late arrival policy to 10 seconds, and configure output to Azure Synapse Analytics with `Exactly once` semantics.
Why this is correct
Tumbling window aligns with fixed intervals; late arrival policy handles out-of-order events; Azure Synapse Analytics supports exactly-once with proper configuration.
Related concept
Static NAT maps one inside address to one outside address.
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.
Trap categories for this question
Command / output trap
Hopping window with hop equal to size is effectively a Tumbling window, but the late arrival handling may still be correct; however, the exact-once semantics require the output to support it; Azure Synapse Analytics does support it with `Exactly once` option.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
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.
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FAQ
Questions learners often ask
What does this DP-203 question test?
Develop data processing — This question tests Develop 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 a Tumbling window of size 1 minute, set late arrival policy to 10 seconds, and configure output to Azure Synapse Analytics with `Exactly once` semantics. — Option D is correct because a Tumbling window counts events per minute, and the late arrival policy with a 10-second window handles out-of-order events. Exactly-once semantics require that output format is Delta Lake or similar with Idempotent writes; however, Azure Synapse Analytics supports exactly-once with appropriate configuration. Option A is wrong because Hopping windows are for overlapping windows. Option B is wrong because Sliding windows are for point-in-time counts. Option C is wrong because Session windows are for periods of inactivity.
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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Last reviewed: Jun 21, 2026
This DP-203 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-203 exam.
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