What’s the Difference between a Hub, a Switch, and a Router?

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What’s the difference between a hub, a switch, and a router?

In a word, intelligence.

Hubs, switches, and routers are all devices that let you connect one or more computers to other computers, networked devices, or even other networks. Each has two or more connectors called ports, into which you plug the cables to make the connection.

Varying degrees of magic happen inside the device — and therein lies the difference.

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Why doesn’t my machine’s IP address match what I’m told on the internet?

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Using tools on my machine, I can see that my IP address is one thing (in my case, 192.168.1.100). But when I go to an internet site that shows me my IP, it shows my something completely different. Which is right?

They both are.

Your machine really has only one IP address, but it isn’t necessarily the IP address that’s used to connect to the internet.

The IP address that appears really depends on who’s looking and from where.

Let me explain the who and where that I’m talking about.

Read moreWhy doesn’t my machine’s IP address match what I’m told on the internet?

Why Does My Home Network Only Work with One Computer at a Time?

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The network consists of a cable modem, a hub/router, CAT5 cable in the walls, and two computers. If I disconnect one computer at the hub, the other one works. If I disconnect that one and connect only the other computer, it works. But, when I connect both neither works. I suspect a problem with the two computers getting the same address. Is this likely? How do I trouble shoot this kind of problem?

I suspect pretty much what you’ve indicated: a problem in the IP address assignment. But exactly what problem depends on a few details. Details we can look at.

Read moreWhy Does My Home Network Only Work with One Computer at a Time?