Objective 3.2
PCNEConfiguring Cloud CDN
Objective 3.2 sits in Configuring managed network services, which carries 16% of the Cloud Network Engineer 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.
A team serves images from URLs that carry no file extension and finds them cached anyway. What does Cloud CDN actually read to judge cacheability?
Correct.
Concept
A naming convention in a URL is a hint rather than a fact, so a cache that has to be correct reads what the response itself declares.
Why D
Cloud CDN does not use file extensions in the URL path to decide whether a response is cacheable, since many valid cacheable responses are not reflected in URLs.
Source
Cloud CDN caching overview, checked August 2026Cloud CDN doesn't use file extensions in the URL path to determine whether a response is cacheable because many valid cacheable responses aren't reflected in URLs.
Now you: objective 3.2 questions
No account needed. The explanation opens when you answer.
Sample question 1 of 3
An origin returns a cacheable static object carrying no caching headers at all. For how long does Cloud CDN treat it as fresh by default?
Sample question 2 of 3
A team sets the cache mode so that the origin alone decides what is cached, then serves a successful response carrying no cache directives. What happens to it?
Sample question 3 of 3
A team switches to the cache mode that stores responses unconditionally and finds some responses still absent from the cache. Which origin header can still suppress 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.