As a dial-up agent, a router can help you find the "way" to which network, forward the information to other places, and block some messages that are not sent to you.

network adapter

A network adapter is a network card. If you don't have a network card, you can't surf the Internet. Network cards provide an interface between computers and Internet devices.

modem

Modem is commonly known as modem, also known as "cat". Its function is to convert the digital signal on the computer with the analog signal on the telephone line. In other words, the digital signal on the computer can't be transmitted on the telephone line, and the analog signal on the telephone line can't be transmitted on the computer. So change it.

port

Generally speaking, a port refers to a socket on an Internet device. Another one is invisible, that is, the logical port. Is the protocol identification number of the transport layer, namely the port number. You may not understand this.

door

Gateway is the "place" where you must go online. Without experience, you can't get online. It has an address-gateway address, and the so-called "place" is inside the router. Of course, there are independent gateways for sale, but ordinary families don't have to buy independent gateways to access the Internet. Unless it's some big professional companies.