1. It's free. It's everywhere on the Internet. Download it at will. There is no need to distinguish between the beta shared version and the cracked version. No one will ask you for money if it is installed. The company saves money.<BR>2. Open source, customizable. But that's good enough.<BR>3. Powerful network function, even the operating system of Cisco equipment uses BSD.<BR>4. Fried chicken is stable. There are many machines that do not need to be shut down or restarted for several years.<BR>5. Good separation of core and shell<BR>6. Sometimes the hardware requirements are very low, for example, do you want to use a router? Celeron 300 + 32m memory + 3 or 4 network cards, install a text interface and run.<BR>
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