PCNE Configuring Network Services Practice Question
A company wants to use Cloud CDN to serve content from a custom origin that is not hosted on Google Cloud. They have enabled Cloud CDN with a backend bucket pointing to an external origin URL. However, content is not being cached. What is a likely reason?
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
✓
The origin does not return Cache-Control or Expires headers.
Cloud CDN with an external origin requires the origin to return explicit cache headers (Cache-Control or Expires) to enable caching. If the origin does not return caching headers, Cloud CDN will not cache the content. Force cache all mode can override this, but if not set, caching may not occur.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The custom origin does not support HTTPS.
Why it's wrong here
Cloud CDN can work with HTTP origins, though HTTPS is recommended.
- ✗
The origin is not configured in the backend bucket as an internet NEG.
Why it's wrong here
Internet NEGs are used for external endpoints, but the bucket itself is the backend; the origin URL is set within the bucket.
- ✗
The load balancer is a Global TCP Proxy, not HTTP.
Why it's wrong here
TCP Proxy is not used for HTTP; the question implies an HTTP load balancer.
- ✓
The origin does not return Cache-Control or Expires headers.
Why this is correct
Without caching headers, Cloud CDN will not cache unless FORCE_CACHE_ALL mode is enabled.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.