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ACE Practice Question: A Cloud CDN cache is serving stale content after…
This ACE practice question tests your understanding of a cloud cdn cache is serving stale content after…. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A Cloud CDN cache is serving stale content after a website update. New files were deployed to Cloud Storage but CDN is still serving the old versions to some users. What is the fastest way to force CDN to serve the updated content?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Wait for the CDN TTL to expire — cached content automatically refreshes
Waiting for TTL expiry is valid but slow — TTLs can range from minutes to days. Cache invalidation provides immediate freshness.
B
Distractor review
Delete and recreate the Cloud Storage bucket — CDN will detect the new bucket as a fresh origin
Deleting the bucket is destructive and unnecessary. Cache invalidation purges the CDN cache without affecting the origin.
C
Distractor review
Disable Cloud CDN temporarily — all users will hit the origin until CDN is re-enabled
Disabling CDN causes all requests to hit Cloud Storage directly, increasing origin load and cost. Cache invalidation surgically fixes the stale content.
D
Best answer
Run a CDN cache invalidation for the affected URL paths
`gcloud compute url-maps invalidate-cdn-cache [URL_MAP] --path=[PATH_PATTERN]` immediately purges matching cached content. CDN fetches fresh content on the next request.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Technical deep dive
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Related practice questions
Related ACE practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
What is the correct order of the Google Cloud resource hierarchy from highest to lowest level?
Question 2
A compliance archive stores legal documents accessed at most once per quarter. Which Cloud Storage class minimizes storage cost while meeting that access pattern?
Question 3
Which gcloud command creates a Compute Engine VM named 'web-01' using the e2-medium machine type in zone us-central1-a?
Question 4
A team wants to receive an email alert when the average CPU utilization of VMs in a managed instance group exceeds 80% for more than 5 minutes. What should they create in Cloud Monitoring?
Question 5
A junior developer needs read-only access to all GCP resources in a project. Which IAM role grants the minimum permissions required?
Question 6
A startup creates its first Google Cloud project. Before deploying any paid resources, what must be linked to the project?
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FAQ
Questions learners often ask
What does this ACE question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Run a CDN cache invalidation for the affected URL paths — Cloud CDN cache invalidation (`gcloud compute url-maps invalidate-cdn-cache`) purges cached content for specified URL patterns immediately. CDN then fetches fresh content from the Cloud Storage origin for the next request. Changing the object's URL (cache-busting) works for future requests but doesn't fix existing cache.
What should I do if I get this ACE question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ACE NAT questions on configuration and troubleshooting.
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