Why would unplugging and then reconnecting a LAN to a DSL modem make an Internet connection work again?

Answer

It's not that it makes the Internet respond, it makes your DSL modem respond. Occasionally DSL and Cable modems will become unresponsive for whatever reason. Disconnecting and reconnting the Internet connection cable is one way to "wake up" the modem. Often that doesn't work and you have to reboot the computer or power-cycle the modem. Annoying but sometimes necessary.

Answer

The way my ISP, who gave me my DSL modem to use, explained it is that, like a computer, every now and then, the modem just needs to be reset or rebooted, much like your computer

 

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