Network Perimeter Defense Architecture: A Case Study

This paper, written as a case study in 2001, documents a comprehensive architecture for defending network resources of a fictitious company. It illustrates an approach to setting up a strong security perimeter. This document was submitted to SANS GIAC to fulfill GIAC Certified Firewall Analyst (GCFW) certification requirements.

This paper is only available in Adobe Acrobat PDF format. You may download it here. The table of contents is listed below for your convenience:

Part 1: Security Architecture
1.1 Assigned Task
1.2 Application Architecture
1.3 Perimeter Defense
1.4 External Connectivity
1.5 Implementation
Part 2: Security Policy
2.1 Assigned Task
2.2 Guiding Principles
2.3 Border Router
2.4 Firewalls
2.5 VPN Configuration
2.6 Applying Policy
2.7 Compliance Monitoring
Part 3: Audit of the Security Architecture
3.1 Assigned Task
3.2 Planning the Assessment
3.3 Assessment of Security Design
3.4 Assessment of Defense Perimeter Implementation
3.5 Assessment of Defense Component Implementation
3.6 Defense Improvement Recommendations
Part 4: Design Under Fire
4.1 Assigned Task
4.2 Targeted Architecture
4.3 Attacking the Firewall
4.4 Denial of Service Attack
4.5 Compromising an Internal System

About the Author

I transform ideas into successful outcomes, building on my 25 years of experience in cybersecurity. As the CISO at Axonius, I lead the security program to earn customers' trust. I'm also a Faculty Fellow at SANS Institute, where I author and deliver training for incident responders. The diversity of cybersecurity roles I've held over the years and the accumulated expertise, allow me to create practical solutions that drive business growth.

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