12 min read Course Complete Lesson 8 of 8
Course 08 Complete

Internet Security & Web Defense

Congratulations! In this capstone lesson, we master the defenses that protect global web applications: Public Key Infrastructure (PKI), XSS, CSRF, CORS, and DDoS Mitigation.

Core Web Security Pillars

1. TLS / Certificate Authorities (CA)

Cryptographic chain-of-trust authenticating server identity and preventing Man-in-the-Middle (MitM) snooping.

2. Cross-Site Scripting (XSS)

Injecting malicious JavaScript. Mitigated via Content Security Policy (CSP) and output encoding.

3. Cross-Origin Resource Sharing (CORS)

Browser sandbox rule allowing servers to selectively whitelist cross-domain API access.

4. DDoS Defense & WAF

Absorbing terabit-scale packet floods via Anycast BGP scrubbing centers and Web Application Firewalls.

Course 08 Graduation Summary

  • You have completed all 8 lessons of Course 08: How the Internet Works!
  • Next Course: Course 09: Modern Web Development — HTML5, Modern CSS, React, REST/GraphQL APIs, and Production Deployment!