Firewalls and VPNs

• What is a Firewall?
• Firewall Limitations
• Firewalls Packet Filters
• Attacks on Packet Filters
• Firewalls Stateful Packet Filters
• Proxy Servers
• Circuit Level Gateway
• Bastion Host
• Host-Based Firewalls
• Personal Firewalls
• Firewall Configurations
• DMZ Networks
• Distributed Firewalls
• Virtual Private Networks
• What is a VPN?
• Layer 2 VPNs
• Layer 3 VPN
• VPN Tunneling Protocols
• GRE
• PPTP
• PPTP Packets
• L2TP
• L2TPv3
• OpenVPN
• Lab 23: Tor

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