PCDOE Optimizing performance and cost Practice Question
A company uses Cloud CDN to deliver content globally. They notice increasing egress costs. Which change will most effectively reduce egress costs?
⚠ Common exam trap
It's easy for candidates to confuse reducing data size (compression) with reducing data volume (caching), or assume that blocking traffic (Cloud Armor) is the primary cost-control mechanism, when in fact increasing cache efficiency is the most direct and effective method to lower egress costs in a CDN architecture.
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 Cloud CDN to cache more content and increase cache hit ratio.
Increasing the cache hit ratio reduces the number of requests that reach the origin server, which directly lowers the volume of data transferred from the origin to the CDN edge. Since egress costs are primarily driven by data served from the CDN edges to users, caching more content at the edge minimizes the need to fetch and serve data from the origin, thereby reducing overall egress traffic and associated costs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Switch to a premium tier network for lower egress rates.
Why it's wrong here
Premium tier has higher per-GB egress costs than standard tier.
- ✗
Enable gzip compression for all responses.
Why it's wrong here
Compression reduces data size but Cloud CDN charges per byte after compression; still, egress costs are based on the compressed size, so savings are limited.
- ✗
Use Cloud Armor to block malicious traffic.
Why it's wrong here
Cloud Armor protects against attacks but does not reduce legitimate egress costs.
- ✓
Configure Cloud CDN to cache more content and increase cache hit ratio.
Why this is correct
Higher cache hit ratio reduces the amount of data fetched from the origin, lowering egress costs.
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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.