- A
Use Cloud CDN cache invalidation to remove the user's content
Why wrong: Invalidation removes cached content but does not prevent the user from fetching it again with a valid signed URL.
- B
Add the user's IP address to a deny list in the load balancer
Why wrong: This would block the IP, but the user might change IPs; also signed URLs can be used from any IP.
- C
Delete the signed URL key that was used to sign the user's URL
Deleting the key invalidates all URLs signed with that key, effectively revoking access.
- D
Change the signing algorithm to SHA512
Why wrong: Changing the algorithm does not revoke existing URLs.
Question 129 of 1,000
PCNE Configuring Network Services Practice Question
This PCNE practice question tests your understanding of configuring network services. 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 media company uses Cloud CDN with signed URLs to distribute premium video content. They need to revoke access for a specific user immediately. Which approach should they take?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"immediately / without restart"Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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
✓
Delete the signed URL key that was used to sign the user's URL
Signed URLs are based on keys; to revoke access, you can either remove the key (invalidates all URLs signed with that key) or wait for expiration. There is no per-user revocation. The correct approach is to delete or disable the signing key, which invalidates all URLs signed with that key.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use Cloud CDN cache invalidation to remove the user's content
Why it's wrong here
Invalidation removes cached content but does not prevent the user from fetching it again with a valid signed URL.
- ✗
Add the user's IP address to a deny list in the load balancer
Why it's wrong here
This would block the IP, but the user might change IPs; also signed URLs can be used from any IP.
- ✓
Delete the signed URL key that was used to sign the user's URL
Why this is correct
Deleting the key invalidates all URLs signed with that key, effectively revoking access.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
- ✗
Change the signing algorithm to SHA512
Why it's wrong here
Changing the algorithm does not revoke existing URLs.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PCNE ACL questions on filtering logic and placement.
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FAQ
Questions learners often ask
What does this PCNE question test?
Configuring Network Services — This question tests Configuring Network Services — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Delete the signed URL key that was used to sign the user's URL — Signed URLs are based on keys; to revoke access, you can either remove the key (invalidates all URLs signed with that key) or wait for expiration. There is no per-user revocation. The correct approach is to delete or disable the signing key, which invalidates all URLs signed with that key.
What should I do if I get this PCNE question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related PCNE ACL questions on filtering logic and placement.
Are there clue words in this question I should notice?
Yes — watch for: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jul 4, 2026
This PCNE 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 PCNE exam.
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