Crash Course: Open-Source Security Tools a Double-Edged Sword
The good news: Plenty of open-source tools are available to test the security of your network and alter your network settings. They're freely available as part of your OS or over the Internet, and they usually cover a wider range and scope than off-the-shelf security products. And, often, these open-source tools have more features than comparable commercial options (though this can mean more complexity). In general, these tools are easy to acquire and install.
The bad news: Would-be attackers know about and have access to these tools, too. Therefore, you must know how intruders can use these tools against you and how to recognize when one is at work in your network.
Start Probing
Open-source network security tools fall into three main categories: those that probe the network; those that listen on the network; and those that alter the network.
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