Developing Applications and Automating Workflows Using Cisco Platforms (DEVASC) — Question 443

A developer has created a three-tier web application for network device control and management. The application consists of multiple objects assigned for different functionalities. The architecture of the application is based on the Observer pattern. Which advantage does this pattern provide for the application design and architecture?

Answer options

• A. Independent observers are updated automatically.
• B. It updates the state of dependent subjects directly.
• C. One observer can query the state of other subjects
• D. It decouples the subjects from the observers.

Correct answer: D

Explanation

The Observer pattern effectively decouples subjects from their observers, allowing for more flexible and maintainable code. This means that changes in one component don't directly affect others, promoting independence. The other options either describe behaviors that do not align with the core benefits of the Observer pattern or misrepresent its functionality.