- A
Enable negative caching for 404 responses to prevent unnecessary backend hits.
Why wrong: Negative caching is for error responses, but dynamic content errors should not be cached.
- B
Configure the cache key to ignore query parameters that are session-specific to improve cache hit ratio.
Ignoring session parameters allows multiple users to share cache.
- C
Set different cache modes: FORCE_CACHE_ALL for static content and USE_ORIGIN_HEADERS for dynamic content.
Allows caching static content aggressively while respecting dynamic headers.
- D
Enable origin shield to reduce the number of requests to the origin server.
Origin shield caches at a central location to protect the origin.
- E
Use signed URLs for all content to ensure only authenticated users can access it.
Why wrong: Signed URLs are for controlled access, not for caching efficiency.
Quick Answer
The correct answer involves three key considerations: cache keys should exclude session-specific parameters, separate cache modes must be used for static versus dynamic content, and origin shield should be enabled to reduce load on the backend. Excluding session parameters from cache keys prevents unique user data from fragmenting the cache, ensuring higher hit ratios for global users. Using distinct cache modes allows static assets like images to be cached aggressively while dynamic API responses bypass or use short TTLs, directly addressing the cloud CDN configuration challenge of mixed content types. On the Google Professional Cloud Network Engineer exam, this tests your understanding of how cache keys, modes, and origin shield interact to optimize performance and origin offload—a common trap is confusing signed URLs (for access control) with caching mechanisms, or assuming negative caching applies to dynamic content. Remember the mnemonic “KMS” for Keys, Modes, and Shield to recall the three pillars of CDN optimization.
PCNE Configuring network services Practice Question
This PCNE practice question tests your understanding of configuring network services. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Which THREE considerations are important when designing a Cloud CDN configuration for a global web application that serves both static and dynamic content?
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
Configure the cache key to ignore query parameters that are session-specific to improve cache hit ratio.
Correct answers: A (Cache keys should exclude session-specific parameters), C (Use separate cache modes for static vs dynamic content), and E (Enable origin shield to reduce load on the backend). Option B is wrong because signed URLs are for content protection, not caching. Option D is wrong because negative caching is not recommended for dynamic content.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Enable negative caching for 404 responses to prevent unnecessary backend hits.
Why it's wrong here
Negative caching is for error responses, but dynamic content errors should not be cached.
- ✓
Configure the cache key to ignore query parameters that are session-specific to improve cache hit ratio.
Why this is correct
Ignoring session parameters allows multiple users to share cache.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Set different cache modes: FORCE_CACHE_ALL for static content and USE_ORIGIN_HEADERS for dynamic content.
Why this is correct
Allows caching static content aggressively while respecting dynamic headers.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Enable origin shield to reduce the number of requests to the origin server.
Why this is correct
Origin shield caches at a central location to protect the origin.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use signed URLs for all content to ensure only authenticated users can access it.
Why it's wrong here
Signed URLs are for controlled access, not for caching efficiency.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which PCNE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
- →
Configuring network services — study guide chapter
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FAQ
Questions learners often ask
What does this PCNE question test?
Configuring network services — This question tests Configuring network services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure the cache key to ignore query parameters that are session-specific to improve cache hit ratio. — Correct answers: A (Cache keys should exclude session-specific parameters), C (Use separate cache modes for static vs dynamic content), and E (Enable origin shield to reduce load on the backend). Option B is wrong because signed URLs are for content protection, not caching. Option D is wrong because negative caching is not recommended for dynamic content.
What should I do if I get this PCNE question wrong?
Identify which PCNE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 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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