6. Identify the Advantages of Common Design Patterns (MVC and Observer) 200-901 Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   Which of the following is a primary advantage of using the Model-View-Controller (MVC) pattern in a software application?

   • AIt ensures that the user interface and business logic are tightly coupled for faster execution.
   • BIt separates the user interface, business logic, and data, which improves maintainability and reusability.
   • CIt eliminates the need for any external libraries or frameworks.
   • DIt guarantees that the application will have no bugs if implemented correctly.
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2. 12application · medium

   A network automation team is building a web portal that lets engineers view device configurations and edit them. The UI team wants to redesign the dashboard without touching the backend logic that fetches and validates configurations. Which design pattern should the team adopt to allow independent UI changes while keeping the data-handling code stable?

   • AMVC pattern, with the model handling data and the view handling presentation
   • BObserver pattern, so the UI can subscribe to configuration changes
   • CFactory pattern, to create configuration objects on demand
   • DSingleton pattern, to ensure only one configuration object exists
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4. 13application · medium

   A DevOps team is developing a monitoring system that must send alerts to email, Slack, and a webhook when a network device crosses a CPU threshold. The team expects to add more notification channels later without modifying the existing alert-triggering code. Which design pattern should the team use?

   • AMVC pattern, where the CPU monitor is the model and the notification channels are views.
   • BObserver pattern, where the CPU monitor is the subject and each notification channel is an observer.
   • CFactory pattern, where each notification channel is created by a factory that also sends the alert.
   • DSingleton pattern, where only one notification channel can be active at a time.
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5. 14foundation · easy

   In the MVC pattern, which benefit is directly achieved by keeping the View separate from the Model?

   • AThe application will run faster because the View does not need to access the Model.
   • BThe application can support multiple user interfaces without changing the underlying business logic.
   • CThe Model no longer needs to store data, as the View handles all data storage.
   • DThe Controller becomes optional and can be removed from the application.
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6. 15application · medium

   A monitoring system tracks interface status changes on network devices. When an interface goes down, the system must update a dashboard, send an alert to the operations team, and log the event. The team expects to add more notification channels later. Which design pattern best supports adding new actions without modifying the core status-detection code?

   • AMVC pattern, with the interface status as the model and the dashboard as the view
   • BFactory pattern, to create alert objects when the interface goes down
   • CSingleton pattern, to ensure only one monitoring instance exists
   • DObserver pattern, with the interface status as the subject and each action as an observer
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