Evaluate an Application Design Considering Scalability and Modularity 350-901 Practice Questions (Page 5)

Questions 21–25

1. 21application · medium

   A team is refactoring a module that currently handles both user input validation and data persistence. They want to improve the design. What is the best way to improve cohesion?

   • ASplit the module into two separate modules: one for validation and one for persistence.
   • BMake the module stateless.
   • CAdd more functions to the module to handle more responsibilities.
   • DCombine the module with another module that handles logging.
   Reveal Solution Discussion Select an answer first
2. 22foundation · easy

   Which design approach best exemplifies the principle of separation of concerns?

   • AUsing a global variable to share data between modules.
   • BCombining all functionality into a single class to reduce the number of files.
   • CCreating a single function that handles both user input and database queries.
   • DSplitting an application into separate layers for presentation, business logic, and data access.
   Reveal Solution Discussion Select an answer first
4. 23application · medium

   A team is designing a new backend service. They want to allow different teams to develop, deploy, and scale their components independently. The components will communicate over HTTP APIs. Which architectural style best fits this requirement?

   • AMicroservices architecture
   • BMonolithic architecture
   • CLayered architecture within a single deployment unit
   • DServerless functions for every operation
   Reveal Solution Discussion Select an answer first
5. 24expert · hard

   A video processing service receives jobs that can take up to 30 minutes each. The service runs on a single VM and users submit jobs via a web UI. During peak hours, the VM is overwhelmed and jobs fail. The team wants to handle the load without losing jobs. Which design change best addresses this?

   • AIncrease the VM's CPU and memory to handle more concurrent jobs.
   • BUse a load balancer to distribute jobs directly to multiple VMs synchronously.
   • CStore jobs in a database and have the web UI poll for results.
   • DPlace incoming jobs in a queue and have worker instances process them asynchronously.
   Reveal Solution Discussion Select an answer first
6. 25application · medium

   A company runs a critical application on a single server. They want to ensure high availability and handle increased load. Which approach is the most effective for both goals?

   • ADeploy multiple instances of the application behind a load balancer.
   • BAdd a cache to the application.
   • CUpgrade the server with more CPU and memory.
   • DMove the application to a single, more powerful server.
   Reveal Solution Discussion Select an answer first