PDE Designing Data Processing Systems Practice Question
A team wants to use Cloud Pub/Sub Lite for a high-throughput, low-cost messaging system. They need exactly-once delivery to subscribers. What should they know about Pub/Sub Lite's delivery guarantees?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Pub/Sub Lite provides at-least-once delivery, same as standard Pub/Sub.
Pub/Sub Lite offers at-least-once delivery like standard Pub/Sub; exactly-once is not guaranteed.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Pub/Sub Lite provides at-least-once delivery, same as standard Pub/Sub.
Why this is correct
Correct: Pub/Sub Lite guarantees at-least-once delivery.
- ✗
Pub/Sub Lite provides exactly-once delivery when using push subscriptions.
Why it's wrong here
Same as C, not correct.
- ✗
Pub/Sub Lite provides exactly-once delivery when using pull subscriptions.
Why it's wrong here
No, delivery guarantee is independent of subscription type.
- ✗
Pub/Sub Lite supports exactly-once delivery by default.
Why it's wrong here
No, it provides at-least-once.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PDE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PDE exam.