What is the main difference between a pull subscription and a push subscription in Google Cloud Pub/Sub?

easy📝 Conceptual Q11 of 15

GCP - Cloud Pub/Sub

APull subscriptions send messages automatically; push subscriptions require your app to request messages.

BPull subscriptions are faster than push subscriptions in all cases.

CPull subscriptions only work with HTTP; push subscriptions only work with gRPC.

DPull subscriptions require your app to request messages; push subscriptions send messages automatically.

Step-by-Step Solution

Solution:

Step 1: Understand pull subscription behavior
Pull subscriptions require the client application to ask for messages explicitly.
Step 2: Understand push subscription behavior
Push subscriptions automatically send messages to the client via HTTP POST.
Final Answer:
Pull subscriptions require your app to request messages; push subscriptions send messages automatically. -> Option D
Quick Check:
Pull = request, Push = automatic [OK]

Quick Trick: Pull means ask; push means receive automatically [OK]

Common Mistakes:

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