11.4. Windows Firewall

Windows Firewall has been standard since Windows XP. In Windows XP SP2, it was enabled by default, and it has steadily improved over the years.

A firewall is designed to protect a computer or network by controlling inbound and outbound traffic. Most firewalls operate with an implicit deny philosophy. In other words, all traffic is blocked (implicit deny) unless there is a rule that explicitly allows the traffic.

Windows Firewall on Windows 7 also uses an implicit deny philosophy. The only traffic that is allowed is the following:

  • Traffic that is explicitly allowed by an exception or a rule. Both inbound and outbound rules can be configured.

  • Return traffic that has been requested. For example, if a user requests a web page ...

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