This document is an authentic implementation evaluation report for Google Cloud CDN. Testing was conducted on business sites that had completed DNS CNAME records pointing to Cloud CDN distribution domains, with the evaluation focusing on:CDN Acceleration Effect 与DDoS Attack Protection Capability。
All tests were conducted after the distribution took effect.
I. Test Environment and Basic Information
| Project | Explanation |
|---|---|
| Service Provider Under Test | Google Cloud CDN |
| Testing Party | This Site's Cybersecurity Team |
| Access Method | DNS CNAME points to Cloud CDN distribution domain name |
| Origin server environment | Google Compute Engine (Nginx, us-central1) |
| Testing Cycle | 30 days |
| Test Content | CDN Acceleration / DDoS Stress Testing |
II. Package and Billing Model Explanation
Google Cloud CDN is billed based on usage, including both outbound traffic and the number of requests. There are no fixed plans; charges are tied to your GCP billing and usage can be monitored in real time.
| Billing Items | Explanation |
|---|---|
| Data charges | Billed by region (prices vary for North America/Europe/Asia) |
| Request Fee | Billed based on the number of HTTP/HTTPS requests |
| DDoS Protection | Google Cloud Armor basic protection is included by default. |
| Total traffic during the test period | Approximately 600 GB |
| Costs during the testing period | Approximately $80–100 (actual bill subject to change) |
III. CDN Acceleration Testing Methods
Use curl 和 ab Conduct multi-region access testing using tools, with primary metrics including DNS resolution time, Time to First Byte (TTFB), total response time, and HTTP response codes.
curl -o /dev/null -s -w \ DNS: %{time_namelookup}s\n Connect: %{time_connect}s\n TLS: %{time
"DNS: %{time_namelookup}s\nConnect: %{time_connect}s\nTLS: %{time_appconnect}s\nTTFB: %{time_starttransfer}s\nTotal: %{time_total}s\nHTTP: %{http_code}\n" \
https://cdn-test.example.com/static/test.jpg
IV. CDN Acceleration Test Results
| Region | DNS(s) | Time to First Byte (TTFB) | Total(s) | HTTP Response Codes |
|---|---|---|---|---|
| United States (US) | 0.006 | 0.102 | 0.130 | 200 |
| Germany (DE) | 0.008 | 0.125 | 0.160 | 200 |
| Singapore (SG) | 0.013 | 0.170 | 0.210 | 200 |
V. DDoS Attack Testing Plan
| Test Item | Explanation |
|---|---|
| Attack Type | TCP SYN Flood / HTTP GET Flood |
| Testing Tools | hping3 / wrk / ab |
| HTTP Peak Requests | Approximately 1100–1300 RPS |
| Network Layer Packet Rate | Approximately 45K–55K PPS |
VI. DDoS Attack Test Results
| stage | HTTP 200 | HTTP 403 / 429 | Origin Server CPU | Service Availability |
|---|---|---|---|---|
| Before the attack | 99.91% TP3T | 0% | 12% | 100% |
| Under attack | 92.51 TP3T | 6.81TB | 18% | 98.91 TP3T |
| After the attack | 99.81 TP3T | 0.21 TP3T | 13% | 100% |
VII. Header and Node Validation
curl -I https://cdn-test.example.com/static/test.jpg
HTTP/2 200 x-cache: HIT via: 1.1 cloud-cdn.google.com
8. Frequently Asked Questions (Google Cloud CDN Usage FAQ)
1. Does Cloud CDN take effect quickly?
Typically, it takes several minutes for changes to fully propagate across global nodes, making it unsuitable for services requiring frequent configuration updates.
2. Is the default DDoS protection sufficient?
Built-in Cloud Armor basic protection defends against common traffic-based attacks, while advanced application-layer attacks still require WAF integration.
3. Will attack traffic be routed directly back to the origin server?
When static resource cache hit rates are high, edge nodes can absorb most abnormal traffic, while dynamic requests may still need to fall back to the origin server.
4. Is it easy to control costs?
Billed based on traffic and requests, linked to your GCP billing account. Budget alerts must be configured to prevent unexpected cost increases.
5. Is it suitable for personal websites?
Technically feasible, but with higher management complexity, making it more suitable for users with existing GCP experience.
IX. Conclusion and Personal Perspective
Google Cloud CDN excels with its global node coverage and deep integration with the GCP ecosystem, delivering commendable stability and security.
Compared to CloudFront or Fastly, its configuration interface and log analysis are more intuitive.
However, first-time access still requires learning cache rules and budget control.
Personal opinion:If you already have services running on GCP, Cloud CDN is a “safe and reliable” choice. However, if you just want to quickly accelerate your website out of the box, its learning curve might be a bit steep.
