Firewall

Description:

• Network Routes must be allowed by firewall rules in order to send and receive packages
• Monitor inbound and outbound traffic and either permit or deny based on rules:
  • IP
  • Type (service name/application layer/port)
  • destination
  • interface
• Found in:
  • hosts
  • segments of a network (between subnets)
  • Perimeter network-based (between network and other networks)

Firewall zones:

• Logical groupings of interfaces or networks within a firewall, enabling different levels of trust and policies for traffic between them.

Stateful vs stateless Firewall:

Stateless firewall:

• simplest

Stateful firewall:

• inspect packet contents and identify the behaviour of the connection and how the data changes throughout the network communication process