Computer History Notes - Herong's Tutorial Notes - v3.13, by Herong Yang
What Is Internet Gateway
This section provides a quick introduction of Telnet application that allows you to log into a remote computer over the Internet as a text based terminal.
What Is Internet Gateway? - An Internet Gateway is an special computer on the Internet that is connected to two physical networks and relays data messages from one network to the other.
If a local physical network wants to join the Internet, it must have a gateway connected to another physical network on the Internet.
For example, your modem at home is an Internet gateway that is connected to your home network and the ISP (Internet Service Provider) network as shown below:
When you open a Website on the Internet, your Web browser actually sends a request message that travels over many physical networks through their gateways in order to reach the Website hosting computer. You can use the "tracert" on a Windows computer to see how many gateways between your computer and a remote computer as shown below (Source: study-ccna.com):
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