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Case Study: 1 
Trey Research Case study 
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Background 
Trey Research is a technology innovator. The company partners with regional transportation department 
office to build solutions that improve traffic flow and safety. 
The company is developing the following solutions: 
 
Regional transportation departments installed traffic sensor systems on major highways across North 
America. Sensors record the following information each time a vehicle passes in front of a sensor: 
•Time 
•Location in latitude and longitude 
•Speed in kilometers per second (kmps) 
 
•License plate number 
•Length of vehicle in meters 
Sensors provide data by using the following structure: 
 
Traffic sensors will occasionally capture an image of a vehicle for debugging purposes. 
You must optimize performance of saving/storing vehicle images. 
Traffic sensor data 
•Sensors must have permission only to add items to the SensorData collection. 
•Traffic data insertion rate must be maximized. 
•Once every three months all traffic sensor data must be analyzed to look for data patterns that 
indicate sensor malfunctions. 
•Sensor data must be stored in a Cosmos DB named treydata in a collection named SensorData 
•The impact of vehicle images on sensor data throughout must be minimized. 
Backtrack 
This solution reports on all data related to a specific vehicle license plate. The report must use data from 
the SensorData collection. Users must be able to filter vehicle data in the following ways: 
•vehicles on a specific road 
•vehicles driving above the speed limit 
Planning Assistance 
Data used for Planning Assistance must be stored in a sharded Azure SQL Database. 
Data from the Sensor Data collection will automatically be loaded into the Planning Assistance database 
once a week by using Azure Data Factory. You must be able to manually trigger the data load process. 
Privacy and security policy 
•Azure Active Directory must be used for all services where it is available. 
•For privacy reasons, license plate number information must not be accessible in Planning 
Assistance. 
•Unauthorized usage of the Planning Assistance data must be detected as quickly as possible. 
Unauthorized usage is determined by looking for an unusual pattern of usage. 
•Data must only be stored for seven years. 
Performance and availability 
•The report for Backtrack must execute as quickly as possible. 
•The SLA for Planning Assistance is 70 percent, and multiday outages are permitted. 
•All data must be replicated to multiple geographic regions to prevent data loss. 
•You must maximize the performance of the Real Time Response system. 
Financial requirements 
Azure resource costs must be minimized where possible. 
 
 
Question: 1 
   
You need to design the vehicle images storage solution. 
What should you recommend? 
 
A. Azure Media Services 
B. Azure Premium Storage account 
C. Azure Redis Cache 
D. Azure Cosmos DB 
 
Answer: B         
 
Explanation: 
Premium Storage stores data on the latest technology Solid State Drives (SSDs) whereas Standard 
Storage stores data on Hard Disk Drives (HDDs). Premium Storage is designed for Azure Virtual Machine 
workloads which require consistent high IO performance and low latency in order to host IO intensive 
workloads like OLTP, Big Data, and Data Warehousing on platforms like SQL Server, MongoDB, 
Cassandra, and others. With Premium Storage, more customers will be able to lift-and-shift demanding 
enterprise applications to the cloud. 
Scenario: Traffic sensors will occasionally capture an image of a vehicle for debugging purposes. 
You must optimize performance of saving/storing vehicle images. 
The impact of vehicle images on sensor data throughout must be minimized. 
References: 
https://azure.microsoft.com/es-es/blog/introducing-premium-storage-high-performance-storage-for-
azure-virtual-machine-workloads/ 
 
Question: 2 
   
You need to design a sharding strategy for the Planning Assistance database. 
What should you recommend? 
 
A. a list mapping shard map on the binary representation of the License Plate column 
B. a range mapping shard map on the binary representation of the speed column 
C. a list mapping shard map on the location column 
D. a range mapping shard map on the time column 
 
Answer: A     
 
Explanation: 
Explanation: 
Data used for Planning Assistance must be stored in a sharded Azure SQL Database. 
A shard typically contains items that fall within a specified range determined by one or more attributes 
of the data. These attributes form the shard key (sometimes referred to as the partition key). The shard 
key should be static. It shouldn't be based on data that might change. 
 
References: 
https://docs.microsoft.com/en-us/azure/architecture/patterns/sharding 
 
Question: 3 
   
HOTSPOT 
You need to design the SensorData collection. 
What should you recommend? To answer, select the appropriate options in the answer area. 
NOTE: Each correct selection is worth one point. 
 
 
Answer:  
 
 
Explanation: 
Box 1: Eventual 
Traffic data insertion rate must be maximized. 
Sensor data must be stored in a Cosmos DB named treydata in a collection named SensorData 
With Azure Cosmos DB, developers can choose from five well-defined consistency models on the 
consistency spectrum. From strongest to more relaxed, the models include strong, bounded staleness, 
session, consistent prefix, and eventual consistency. 
Box 2: License plate 
This solution reports on all data related to a specific vehicle license plate. The report must use data from 
the SensorData collection. 
References: 
https://docs.microsoft.com/en-us/azure/cosmos-db/consistency-levels 
 
Question: 4 
   
You need to recommend an Azure SQL Database pricing tier for Planning Assistance. 
Which pricing tier should you recommend? 
 
A. Business critical Azure SQL Database single database 
B. General purpose Azure SQL Database Managed Instance 
C. Business critical Azure SQL Database Managed Instance 
D. General purpose Azure SQL Database single database 
 
 
Answer: B     
 
Explanation: 
Azure resource costs must be minimized where possible. 
Data used for Planning Assistance must be stored in a sharded Azure SQL Database. 
The SLA for Planning Assistance is 70 percent, and multiday outages are permitted. 
 
Question: 5 
   
HOTSPOT 
You need to design the Planning Assistance database. 
For each of the following statements, select Yes if the statement is true. Otherwise, select No. 
NOTE: Each correct selection is worth one point. 
 
 
Answer:  
 
 
Explanation: 
Box 1: No 
 
Data used for Planning Assistance must be stored in a sharded Azure SQL Database. 
Box 2: Yes 
Box 3: Yes 
Planning Assistance database will include reports tracking the travel of a single vehicle 
 
Question: 6 
 
HOTSPOT 
You need to design the data loading pipeline for Planning Assistance. 
What should you recommend? To answer, drag the appropriate technologies to the correct locations. 
Each technology may be used once, more than once, or not at all. You may need to drag the split bar 
between panes or scroll to view content. 
NOTE: Each correct selection is worth one point. 
 
 
Answer:  
 
 
Explanation: 
Box 1: SqlSink Table 
Sensor data must be stored in a Cosmos DB named treydata in a collection named SensorData 
Box 2: Cosmos Bulk Loading 
Use Copy Activity in Azure Data Factory to copy data from and to Azure Cosmos DB (SQL API). 
Scenario: Data from the Sensor Data collection will automatically be loaded into the Planning Assistance 
database once a week by using Azure Data Factory. You must be able to manually trigger the data load 
process. 
Data used for Planning Assistance must be stored in a sharded Azure SQL Database. 
 
References: 
https://docs.microsoft.com/en-us/azure/data-factory/connector-azure-cosmos-db 
 
Question: 7 
 
You need to design the runtime environment for the Real Time Response system. 
What should you recommend? 
 
A. General Purpose nodes without the Enterprise Security package 
B. Memory Optimized Nodes without the Enterprise Security package 
C. Memory Optimized nodes with the Enterprise Security package 
D. General Purpose nodes with the Enterprise Security package 
 
Answer: B