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Objective 4.1

PCD

Integrating applications with data and storage services

Objective 4.1 sits in Integrating applications with Google Cloud services, which carries 21% of the Cloud Developer exam. The questions below are original, written from the official objective title above, and each explanation cites the Google Cloud page it rests on.

Objective title verbatim from the official objectives. Google Cloud exam page ↗

A worked example

Shown solved, with the whole explanation open: this is what every question here carries.

4-1Integrating applications with Google Cloud services

A team wants exactly-once semantics on a subscription that currently pushes messages to an HTTPS endpoint. What has to change first?

The topic must enable message orderingOrdering constrains sequence and says nothing about repeat delivery.
The endpoint must return an ack responseThe response an endpoint returns is not what the guarantee rests on.
The subscription must become a pull oneCorrect · your answerCorrect. The receiver has to be the one asking.
The publisher must set a unique keyThe identifier the guarantee uses is assigned by the service itself.

Correct.

Concept

A delivery guarantee that depends on the receiver reporting the outcome of each acknowledgment can only hold where the receiver initiates the exchange.

Why C

Only pull subscriptions support the feature, including subscribers using the streaming pull interface. Push and export subscriptions do not support it at all.

Source

Only the pull subscription type supports exactly-once delivery, including subscribers that use the StreamingPull API . Push and export subscriptions don't support exactly-once delivery. Pub/Sub supports exactly-once delivery, within a cloud region, based on a Pub/Sub-defined unique message ID .

Pub/Sub exactly-once delivery, checked August 2026
#gcp#pubsub#exactly-once#subscriptions

Now you: objective 4.1 questions

No account needed. The explanation opens when you answer.

Sample question 1 of 3

4-1Integrating applications with Google Cloud services

After a message is redelivered when its deadline expired, a worker acknowledges it using the identifier issued with the first delivery. What follows?

Sample question 2 of 3

4-1Integrating applications with Google Cloud services

A team wants to recognise that an arriving message is one its workers have already seen once. What value stays constant across redelivery attempts?

Sample question 3 of 3

4-1Integrating applications with Google Cloud services

A team runs subscriber instances in three regions against one subscription that has the feature switched on. What can still happen to it?

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Read the sources

These are the official pages the questions above cite. Reading them is studying the objective from the primary source, which is what the explanations point you toward anyway.

More objectives in Integrating applications with Google Cloud services