Exam 200-901 topic 1 question 525 discussion

Actual exam question from Cisco's 200-901

Question #: 525
Topic #: 1

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?

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.

Show Suggested Answer

Suggested Answer: D 🗳️

by Lacko9 at Feb. 25, 2024, 1:33 a.m.

Comments

Submit Cancel

sawdog20_111

9 months ago

Selected Answer: D

The Observer pattern promotes loose coupling between the subjects (the network devices or their controllers) and the observers (components interested in the devices' state changes).

upvoted 2 times

...

uzu13

9 months, 3 weeks ago

Selected Answer: D

The Observer pattern decouples the subjects from the observers. The separation is achived by loose coupling, independence and dynamic registration.

upvoted 3 times

...

Lacko9

10 months, 1 week ago

Selected Answer: A

Subject it is object being observed = the data that is to be synchronized□ Subject has a registration process that allows other components to subscribe to the process □ Once registered, a subscriber is sent an update notification whenever there is a change in the subject's data □ ▪ Observer Component that registers with the subject□ Only function is to synchronize its data with the subject when called□ Doesn't use a pulling process, updates are push only

upvoted 1 times

...