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Now a network consists of 2 main categories or 2 main components
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We have what’s called the Physical Components that are used
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to create a physical topology and here we are physically
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connecting devices to each other using various types of cables
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We may be using Ethernet cables as shown here,
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we may be using optical cables or fiber cables and more and more
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these days we used the air to connect devices to each other
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We also have the logical connection or logical topology
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and these discusses how data is transported across physical cables or
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across the air in the wireless environment
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So how data is actually transferred or transported from one device to another?
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that’s the logical connection made between devices
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Various protocols are used to do this, think of a protocol as a type of language
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So at the moment I am speaking English but a protocol called IP
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or Internet Protocol is used for communication in a lot of networks today
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When physical cabling is used you would plug an Ethernet cable such as
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in this example into what’s called a Network Interface Card or NIC on a PC
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Network Interface Card gives your PC the physical capability to connect to a network
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If a wireless device such an iPad or an iPhone or a MAC
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was used to connect to a wireless network a wireless Network Interface Card
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is used to enable that device to send and receive data
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through wireless transmission across the air
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That’s very similar to a traditional radio receiving radio signals
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from a broadcaster so that you can listen to music while driving
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in the same way you’re iPad is receiving data through the use of airwaves
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and is also transmitting back to wireless routers as an example
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A traditional radio just receives signals but other devices can
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transmit and receive and in the same way your iPad or PC
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is transmitting and receiving data through the use of radio waves
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