PCNE Configuring Network Services Practice Question
A developer wants to use Cloud CDN to cache content from a backend bucket. They want to cache all objects regardless of cache-control headers, but need to exclude certain URL patterns (e.g., /private/*) from caching. Which cache mode should they choose?
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
✓
FORCE_CACHE_ALL
Cloud CDN cache modes: FORCE_CACHE_ALL caches all content irrespective of origin headers; USE_ORIGIN_HEADERS respects cache-control; CACHE_ALL_STATIC is similar to FORCE_CACHE_ALL but for static content. To exclude certain paths, you need to set up cache key or use URL map routing to different backends. The question asks for cache mode; FORCE_CACHE_ALL will cache everything by default, but to exclude patterns, you need to configure cache key rules or separate backends. However, the best answer among the options is FORCE_CACHE_ALL because it caches all objects, but the exclusion would require additional configuration. There is no "CACHE_ALL_EXCEPT" mode. Actually, the correct approach is to use a URL map with two backend buckets: one for public content with FORCE_CACHE_ALL, and one for private content with no CDN. But among the cache modes, FORCE_CACHE_ALL is the one that ignores cache-control.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
FORCE_CACHE_ALL
Why this is correct
This mode caches all objects regardless of cache-control. To exclude specific paths, you would need additional configuration like separate backends.
- ✗
CACHE_ALL_STATIC
Why it's wrong here
This mode caches static content based on file extension; it might not cache dynamic content.
- ✗
DISABLED
Why it's wrong here
Disabling CDN would not cache anything.
- ✗
USE_ORIGIN_HEADERS
Why it's wrong here
This mode respects the origin's cache-control headers; it would not cache objects with no-cache or private directives.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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