Windows computers have a similar utility (netstat) built into the operating system. Macs are just as vulnerable in many cases to network based attacks. The supposed security benefits of the Mac exist only because it is used on only 10% of desktop computers. As adoption of the OS increases, security will decrease as it becomes more of a target of hackers. The exact same thing happened with Firefox. Now that adoption has reached an estimated 15% of the market, vulnerabilities are being detected more frequently as attackers are seeing it as a viable target.

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The best way to learn anything, is to question everything.