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YouTube – Verify and control/limit connections to and use of external systems
Norfolk State University – Administrative Policy: Use of External Information Systems
SANS Whitepaper – Proxies and Packet Filters in Plain English
SANS Whitepaper – Web Application Firewalls
NIST SP 800-77 Guide to IPSec VPNs
NIST SP 800-41 Rev 1: Guidelines on Firewalls and Firewall Policy