PCNE Configuring Network Services Practice Question
An organization configures a Global external HTTP(S) Load Balancer with Cloud CDN. They notice that some users are getting stale content even after they have invalidated the cache for specific objects. What is the most 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
✓
Invalidation requests are queued and take time to propagate globally
Cache invalidation removes objects from cache but does not prevent new requests from being served stale content if the origin returns a 304 Not Modified or if there is a propagation delay. However, the most common cause is that the invalidation has not propagated to all edge caches yet.
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 URL map is routing to the wrong backend
Why it's wrong here
This would cause wrong content, not stale content.
- ✓
Invalidation requests are queued and take time to propagate globally
Why this is correct
Cache invalidation can take minutes to propagate to all edge locations.
- ✗
The objects were cached with a very long TTL
Why it's wrong here
Invalidation overrides TTL; TTL does not prevent invalidation.
- ✗
Cloud CDN does not support invalidation for backend buckets
Why it's wrong here
Cloud CDN supports invalidation for both backend services and buckets.
Go deeper
Related to this question
About these practice questions
Courseiva writes every PCNE question from scratch — 961 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or dumps. Learn why practice questions differ from exam dumps →
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.