PCDOE Optimizing service performance Practice Question
A media streaming service uses Cloud Storage to store video files and serves them via Cloud CDN. Users in Asia report buffering issues. The team notices that the cache hit ratio is low in that region. The origin is a single Cloud Storage bucket in us-central1. Which set of actions would best improve performance for Asian users?
⚠ Common exam trap
Google Cloud often tests the misconception that Cloud CDN alone solves all latency issues, but the trap here is that cache hit ratio depends on both edge caching and origin proximity; without a local origin, cache misses still cause high latency for distant users.
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
✓
Create a new Cloud Storage bucket in an Asian region and use dual-region bucket with Cloud CDN.
Creating a new Cloud Storage bucket in an Asian region and using a dual-region bucket with Cloud CDN reduces latency by serving content from a geographically closer origin, improving cache hit ratios for Asian users. Cloud CDN caches content at edge locations, but if the origin is far away (us-central1), the first miss still incurs high latency. A dual-region bucket provides a local origin for cache misses, significantly reducing round-trip time.
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 Load Balancing with Cloud Armor to protect the origin.
Why it's wrong here
Cloud Armor provides security, not performance.
- ✗
Enable HTTP/2 on Cloud CDN and increase the TTL for video content.
Why it's wrong here
HTTP/2 improves connection reuse but does not reduce origin latency.
- ✗
Configure a custom domain on Cloud CDN with SSL and enable request collapsing.
Why it's wrong here
Custom domain and request collapsing do not address the geographic distance to origin.
- ✓
Create a new Cloud Storage bucket in an Asian region and use dual-region bucket with Cloud CDN.
Why this is correct
A closer origin reduces latency for cache misses, improving performance.
Go deeper
Related to this question
About these practice questions
This PCDOE question is part of Courseiva's 486-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam 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 PCDOE 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 PCDOE exam.