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> Chapter 9 - Firewall > Firewall concepts

Firewall concepts

There are a number of concepts that are consistent throughout the firewall industry. Having a solid grasp of these ideas and terms can give you a better idea of what your FortiGate firewall is capable of and how it will fit within your network's architecture.

This chapter describes the following firewall concepts:

  • What is a Firewall?
  • IPv6
  • NAT
  • How packets are handled by FortiOS
  • FortiGate modes
  • Quality of Service
  • Interfaces and zones