I understood that the firewall was mainly the port control function of the OS. However, I learned that it sometimes refers to the device or system itself that blocks communication that should not be passed . In other words, if a router or gateway device in the network is responsible for monitoring ports, packets, and protocols, these are called firewalls to distinguish them. Firewall-Wikipedia In the background that came into the spotlight in recent years, A wide variety of cyber attacks have increased, and the security functions required for devices that are gateways to networks have increased. Due to the spread of remote work, there has been a demand for access to the internal network from the outside. (Until now, it should have been denied all access from outside to inside) Under such circumstances, it seems that network equipment vendors have come to call products that include various security measures functions as “next-generation firewalls (NGFW).……

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