Every company has its own computer that belongs to finance department. I can bound computer's mac and IP. Although computer always communicate after installing IP address, but actually computers don't communicate by IP, but MAC address. Besides, IP address is easily changed, MAC address is in EEPROM. So if someone wanna change IP address to steal important information, the one will fail because mac address is wrong.
Besides, when we build a website, we should pay attention to domain and hosting. For example, i wanna run a website of cafe shop, the domain can be www.cafeshop.com. And the domain the only one, if people search www.cafashop.com, they can visit my website and look different kind of cafa. I can also put the domain to another website, customers can click the link to website.
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