In the present invention,
physical network separation is achieved in a
laptop PC by simply connecting a network separation
dongle according to the present invention while using an
operating system installed on the internal disk of the
laptop PC. Accordingly, for
physical network separation, the internal network cable and the external network cable are connected and used as a basic method. In addition, the external network is configured by connecting the user's smartphone to the network separation
dongle of the present invention via a
USB cable and then activating the
tethering function on the smartphone to convert signals such as 5G, LTE, WiFi, etc., from the smartphone into
Ethernet network signals, thereby providing a PC usage environment where at least the PC connected to the network separation
dongle can be used safely without worrying about hacking, data leakage, or infection from
malware such as
ransomware and viruses from the outside. Furthermore, while conventional
physical network separation inevitably requires a network
interconnection environment via a network for
data transmission between internal and external networks, potentially leading to vulnerabilities in
network security, the present invention enables
data transmission between internal and external networks without a network by creating a shared folder on the desktop of
virtual machine software used for the external network, or on any folder within the explorer window of the main screen.