Firewalls monitor and regulate the data moving on and off your computer or network. They can keep criminals out while allowing legitimate network traffic in. Mac OS X comes with not one but two firewalls of its own. Even so, those two aren't always enough. Years ago, a bug (long-since fixed) let attackers send Macs a so-called 'ping of death'-specially designed network traffic that could crash a system. There aren't any such network vulnerabilities (that we know of) on Macs now, but many of Apple's security updates specifically address network vulnerabilities. Clearly, Macs aren't inherently immune. With millions of computers in the world, it might seem that the odds of your Mac being targeted are awfully small. But there are computers out there that do nothing all day but probe internet-connected machines for vulnerabilities; it's certainly possible that one will find yours.
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机译：防火墙监视和管理在计算机或网络上和外移动的数据。他们可以阻止犯罪分子，同时允许合法的网络流量进入。Mac OS X本身不带一个防火墙，而是带两个防火墙。即使这样，这两个并不总是足够的。几年前，一个漏洞（长期以来已解决）使攻击者向Mac发送了所谓的“死亡”，这是特别设计的网络流量，它可能导致系统崩溃。 Macs上现在没有（我们知道）任何此类网络漏洞，但是Apple的许多安全更新专门解决了网络漏洞。显然，Mac并非天生具有免疫力。世界上有数百万台计算机，因此将Mac作为目标机的可能性似乎很小。但是，那里的计算机整日无所作为，只能探测连接互联网的机器是否存在漏洞。当然有可能找到您的。
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