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In this video we’re not going to be doing anything, we’re not gonna be learning about networking specifically on Linux. We need to understand a few general concepts before we get to that. So, this video is going to be a sort of introduction to networking on Linux. An introduction to networking in general. So, right now you are on a computerized device watching this video which is on the Internet. And the way that’s happening is basically you’re connected to a router, or a modem router all-in-one device, and the router is connected to your internet service provider, and your internet service provider has devices that are connected to the bigger world of the internet. So, you send a request, if you open up a browser and type in google.com and then hit enter, your web browser sends that as a request. It’s basically saying okay this is the web page that this computer wants to look at right now. It sends that through your router, which sends it to your internet service provider, and your internet service provider has all these fancy computers that properly route certain requests to DNS servers, any requests actually. What a DNS server does is it says okay, you gave me this string of text, a domain name or URL, and I have a record here that shows this domain or string of texts is supposed to serve up the content at this IP address. And so how the internet works is it doesn’t understand Google.com or Facebook.com. The internet uses network addresses, right, and so think of it like each web server, each server out there has and address just like every house on your street has an address. So, if you were gonna send somebody down the street to Joe’s place, you would say okay well go to this address, then you would give them the address of Joe’s place and they would be able to find it. The same thing is happening on a DNS server. You give the DNS server a domain name that you want to look at, and then th the DNS server takes that and says okay well I know this domain name is supposed to route to this IP address. So, you request, you need to go over to the server to get that content, and so your request then gets translated to an IP address and other information, and it gets to the web server that it’s supposed to be at. And then the web server running Apache or anything really nginx, I’m sure there’s tons out there that I don’t know about, but the web server receives requests, it receives all of the information related to it. So, cookies you know session variable stuff like that as well as the exact item you want to look at it. So, if you go to website.com/something /something else, everything after the .com/ is called a URI and that indicates what piece of content on the server you want. So, think of the first part domain.com as what server you need to be communicating with, and then afterward you know /about.php or something that’s gonna tell the server once it gets the request what page it needs to send you. And then it does it’s you know rendering process and it sends you that page in the exact same route that your request took to get there. So, it’s like when you send your friend down the street to Joe’s place to pick up a box of pizza. So, your friend walks down the street he turns left you know maybe turns right, he gets to Joe’s place, he walks in says hey I need to get a pizza, Joe gives him the pizza, then he walks same way back to your house, and before you know it a web page has loaded within your computer box. That’s how that happens. I hope you guys understood that. In the next video we’re actually gonna cover a few more concepts before we dive into you know really understanding to the point that we can use applications to do certain things. So, I hope you guys found that informative. If you didn’t, if there’s any point in this video that you felt lost or confused, or even that I was just rambling, or even if you just want to tell me you know a few more web server applications aside from Apache, there is a comment section to the side of this video. You just leave a comment I will reply and get you whatever information you need, and hopefully this will make sense to you.
