Practice Test 4 | Google Cloud Certified Professional Cloud Architect | Dumps | Mock Test
Your team is developing a social engagement app in Node.js on App Engine Flexible Edition.
Among the various features required, there is an online chat between related and connected users.
Which of the following functions should you use or activate to accomplish what is required? (Choose 2)
A. Redis store
B. Node.js client to Cloud Storage
C. Custom domains
D. oAuth 2.0 and App Engine firewall
E. Session Affinity
F. Websocket
Correct Answers: E, F
In order to develop a chat application, it is necessary to establish a permanent connection between the client and the App Engine instance (Server).
This is achieved with the WebSocket protocol, defined with the RFC 6455 standard, which provides full-duplex communication, initiated by an HTTP (S) request with an “upgrade” header.
WebSockets are always available for the application without any additional configuration. Once a WebSocket connection is established, it will expire after an hour.
It is also appropriate to use Session affinity. App Engine normally uses sessionless connections, but in this case, you have to support long polling so that the Server always waits for new information from its client. In this case, multiple sequential requests from a given user need to reach the same instance.
All the other answers are not related to the requirements:
- Redis is a cache in-memory DB
- Node.js client to Cloud Storage is a library for using the Object Store
- Custom domains are DNS-related
- oAuth 2.0 and App Engine firewall are connected to the User Authorization Process and to the app Security
For any further detail, please visit the URLs below:
https://cloud.google.com/appengine/docs/flexible/nodejs/using-websockets-and-session-affinity
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