CloudFlare is CDN with robust security features.

[ESCO]

CloudFlare is CDN with robust security features. Online threats range from comment spam and excessive bot crawling to malicious attacks like SQL injection. It provides protection against comment spam, excessive bot crawling, and malicious attacks.
Feature:

• It is an enterprise-class DDoS protection network
• Web application firewall helps from the collective intelligence of the entire network
• Registering domain using CloudFlare is the most secure way to protect from domain hijacking
• Rate Limiting feature protects user's critical resources. It blocks visitors with suspicious number of request rates.
• CloudFlare Orbit solves security issues for IOT devices