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
- 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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