This DP-900 practice question tests your understanding of identify considerations for relational data on azure. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 are designing a relational database for an IoT application that ingests high volumes of time-stamped sensor data. The queries frequently filter by device ID and time range. Which index strategy would optimize query performance?
Create a non-clustered index on Timestamp only
Why wrong: Does not optimize for DeviceID filter.
Create a composite index on (DeviceID, Timestamp)
This index supports filtering by device and time.
Create a clustered index on DeviceID only
Why wrong: Does not optimize for time range filtering.
Create a non-clustered index on SensorType
Why wrong: SensorType is not relevant to the query pattern.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Create a composite index on (DeviceID, Timestamp)
Option A is correct because a composite index on (DeviceID, Timestamp) supports both filters efficiently. Option B is wrong because a single index on Timestamp does not help with DeviceID filtering. Option C is wrong because a clustered index on DeviceID only helps if queries filter solely by DeviceID. Option D is wrong because indexes on non-key columns like SensorType are not helpful for the given query pattern.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Create a non-clustered index on Timestamp only
Why it's wrong here
Does not optimize for DeviceID filter.
Create a composite index on (DeviceID, Timestamp)
Why this is correct
This index supports filtering by device and time.
Related concept
Static NAT maps one inside address to one outside address.
Create a clustered index on DeviceID only
Why it's wrong here
Does not optimize for time range filtering.
Create a non-clustered index on SensorType
Why it's wrong here
SensorType is not relevant to the query pattern.
Common exam traps
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
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.
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
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
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.
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FAQ
Identify considerations for relational data on Azure — This question tests Identify considerations for relational data on Azure — Static NAT maps one inside address to one outside address..
The correct answer is: Create a composite index on (DeviceID, Timestamp) — Option A is correct because a composite index on (DeviceID, Timestamp) supports both filters efficiently. Option B is wrong because a single index on Timestamp does not help with DeviceID filtering. Option C is wrong because a clustered index on DeviceID only helps if queries filter solely by DeviceID. Option D is wrong because indexes on non-key columns like SensorType are not helpful for the given query pattern.
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.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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