Evaluate an Application Design Considering Scalability and Modularity 350-901 Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   An application stores user session data in memory on the web server. Which scaling approach is most directly hindered by this design?

   • AVertical scaling, because increasing the server's memory will not solve the problem of session data being lost on restart.
   • BBoth horizontal and vertical scaling are equally hindered because session data is always lost when scaling.
   • CHorizontal scaling, because user requests may be routed to a different server that does not have the session data.
   • DNeither horizontal nor vertical scaling is affected because session data can be replicated automatically.
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2. 7foundation · easy

   Which design pattern promotes modularity by allowing a class to receive its dependencies from an external source rather than creating them internally?

   • ASingleton
   • BDependency injection
   • CFactory method
   • DObserver
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4. 8foundation · easy

   Which statement accurately describes a trade-off when choosing horizontal scaling over vertical scaling for an application?

   • AHorizontal scaling provides a single point of failure, while vertical scaling eliminates it.
   • BHorizontal scaling always results in lower cost than vertical scaling for the same workload.
   • CHorizontal scaling is limited by the maximum capacity of a single server, while vertical scaling has no upper limit.
   • DHorizontal scaling requires modifying the application to distribute work across multiple instances, while vertical scaling typically requires no code changes.
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5. 9expert · hard

   A company runs a batch processing job that runs nightly. The job takes 4 hours on a single VM. The team wants to reduce the runtime. They have a budget for more hardware but want to minimize changes to the application code. Which approach is most appropriate?

   • AAdd a cache to store intermediate results.
   • BRewrite the job to use a queue and process items asynchronously.
   • CPartition the data and run multiple instances of the job in parallel.
   • DUse a larger VM with more CPU cores and memory.
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6. 10application · medium

   A development team is refactoring a legacy application. Currently, the user interface code directly contains SQL queries and business logic. The team wants to improve maintainability by separating concerns. Which refactoring approach best achieves this goal?

   • AUse a single-tier architecture where all code resides in one file for simplicity.
   • BIntroduce a layered architecture with separate presentation, business logic, and data access layers.
   • CMove all SQL queries into stored procedures in the database.
   • DCombine all business logic into a single utility class to reduce the number of files.
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