Firewalls

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Introduction

There are four primary categories of firewall:

• Physical firewalls
• Virtual firewalls
• Hypervisor-integrated firewalls
• Client Firewalls

Physical firewalls

e.g. Juniper SSG, Cisco PIX, Cisco ASA, etc

Virtual firewalls

e.g. Fortigate, pfSense, etc

Hypervisor-integrated firewalls

e.g. VMware NSX

Client Firewalls

e.g. Windows Firewall, iptables, etc