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Firewall and Security

In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. A firewall typically establishes a barrier between a trusted internal network and untrusted external network, such as the Internet.

Firewalls are often categorized as either network firewalls or host-based firewalls. Network firewalls filter traffic between two or more networks and run on network hardware. Host-based firewalls run on host computers and control network traffic in and out of those machines.


  • Introduction to Firewalls

  • Introduction to IDS

  • Access Control Lists

  • Context-Based ACcess Control (CBAC)

  • TCP Intercept

  • Hardening Router Security

  • AAA [Authentication, Authorization, and Accounting]

  • IPSEC Overview

  • IPSEC Site-to-Site Tunnels on IOS Device

  • Network Address Translation (NAT)


Cisco ASA/PIX Firewalls

  • Fortinet

  • Checkpoint 

  • Palo Alto

  • Cisco Meraki

  • Aewin

  • Cyberoam

  • Sophos

  • Sonicwall

  • Introduction to Cisco PIX/ASA Firewalls

  • The PIX OS Command Line Interface

  • NAT on a PIX/ASA

  • PIX/ASA Access-Lists

  • IPSEC Site-to-Site Tunnels on a Cisco PIX/ASA      

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