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You are here: Home / CompTIA / Network+ / Section V: Network Security / Chapter 31: Firewalls / Firewall Rules

Firewall Rules

Firewalls usually block all traffic by default. To permit certain types of traffic, you can create a list of rules that reflects the firewall behavior. Firewalls generally operate using rules known as tuples, which are a grouping of variables:

  • Source IP
  • Destination IP
  • Port number
  • Application
  • Packet size
  • Time of day

For example, if you configure a rule to allow a specific source IP to communicate with a specific destination IP, the source IP and the destination IP form a tuple.

Firewall rules take a logical . . .

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