I - Computer connected to the Internet without a personal firewall

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There is no network protection; all the network data streams (TCP/IP connections) can circulate:

• The computer can accept connection attempts coming from the Internet and allow someone access to the computer (by using a Trojan Horse or simply file sharing, if this is activated).
• The computer can output any traffic whatsoever, even without the user being aware (if malware is running on the system, the computer can propagate a worm, send e-mails, send your confidential codes, etc).