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Is my home router.
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In this example it's a British Telecom or BT Home Hub.
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Five Rodda I'm connected to the Internet using a DSL.
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If you're not sure what a DSL Please don't worry we'll talk about it later.
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It's essentially a way to connect through telephone lines to the Internet.
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And as you can see here I have some devices connected to what's called a 2.4 gigahertz wireless network
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and a five gigahertz wireless network.
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They are different frequencies and wireless that you can use to connect to networks and there are benefits
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and drawbacks of both.
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I also have some devices connected via the physical network to this router so as an example I can surf
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to Facebook does comb through my router on my local Windows PC I can use a program called Ping to test
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connectivity to a remote network or remote site.
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So in this example I'm pinging Facebook dot com.
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And as you can see here I'm getting a reply from what's called an IP address.
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We'll discuss IP addresses and what are called domain names in more detail later.
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But essentially Facebook dot com is what's called a domain name and it gets resolved to what's called
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an IP address by something called a domain name system server or DNS server.
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So a DNS server has told my local PC that Facebook to come has this IP address and I'm able to test
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my connectivity to that IP address using this program called Ping.
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In this example I'm getting a reply from Facebook dot com.
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So I've just tested that I have connectivity to Facebook dot com and I can even check the path to Facebook
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dot com using an application called Trace search in Windows.
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So I'm going to type traceroute.
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Facebook dot com.
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And what this does now is show me each hop.
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Each device that I am hopping across or jumping across or going through to get to Facebook dot com
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some devices will not reply to those protocol.
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But as an example here you can see that I've hit a call BT router some way in the Internet and this
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traffic is now being forwarded across multiple devices.
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Two Facebook dot com and you can see that we hitting devices called C-1 and various other devices to
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get to Facebook that come.
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Don't worry too much about the details.
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All I want you to see at the moment is that networks including your home network or DSL Rodda at home
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allow you to connect to the Internet and then allow you to connect to sites on the Internet and elsewhere
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networking is essentially the plumbing or the underlying infrastructure that enables devices to share
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information with one another in its most simplest form.
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You may have a PC and want to share a file with someone else.
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So your laptop is able to access a file shared on a PC across a physical cable or more and more these
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days using wireless.
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Another example may be a printer you may have a printer and want to print to that printer across a wireless
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network at home or by physically connecting a cable to the printer.
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Networks essentially allow for the sharing of resources such as files between computers or printers.
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So this printer could except print jobs from multiple PCs or even a phone.
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These days networks allow us to make voice calls using applications such as WhatsApp and Skype.
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They are essentially the plumbing allowing you to connect one device to another.
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