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So building Anami example of a simple network consisting of two PCs at home you may have a network connecting
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you to the Internet using an DSL or cable or some other type of broadband connection which allows you
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from your laptop or desktop to access the internet.
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You may have an idea cell Rodda connecting to a modem or directly to your Internet service provider
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or ISP that router may provide wireless connectivity so that you can access the Internet from your iPad
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or iPhone or a laptop anywhere in your house or it may have a wired connection where you physically
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cable a PC such as a desktop into the router.
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Now in its most simple terms a router essentially receives data from a PC or an iPad and then determines
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which to forward it so it may receive a message from your PC on one interface and then it needs to make
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a decision where am I going to send those traffic or data do I send it on to the wireless network so
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that it can be sent to the laptop or do I send it onto the Internet.
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Because you trying to access a web site such as Facebook does come at a very basic level.
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A router or other devices such as switches simply move data or information from one thing to face to
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another interface based on some kind of decision criteria in the same way as you may make decisions
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every day about which way to drive or which bus route or train route to take roads make decisions based
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on some kind of criteria to determine the best path to a destination.
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The Internet consists of many thousands of routers that are making decisions all the time about the
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best path or route to a destination.
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If you were driving from San Francisco to New York you would make a decision on which way to drive.
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You'd have to decide which path to take if you are driving as an example from San Francisco to San Jose.
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You probably wouldn't decide to drive via New York because the distance is far greater VI in New York
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than it would be simply driving from San Francisco to San Jose in the same way a router will make a
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decision based on distance or what's called a cost of a route to determine the best path to a destination.
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So your home network may consist simply of a router with some iPads or laptops and desktops or you may
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have a large home network or work in a small business environment or Soho environment Soho small office
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home office and in an environment like this you may have a router connected to a device called a switch
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a switch essentially gives you multiple ports or interfaces that you can connect devices to.
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So in this example we have a network printer and two PCs that are connected physically via a cable to
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a switch which in turn is connected to the router.
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Now in a lot of home environments the switch is built into the router so you won't have two physical
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devices.
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There'll be one device.
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The router may provide wireless connectivity once again so that your wireless laptop or iPad can connect
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to the Internet without cables.
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