Networks and the Internet

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En provenance du cours de University of California, Davis

Introduction to Web Development

239 notes

University of California, Davis

Introduction to Web Development

239 notes

This course is designed to start you on a path toward future studies in web development and design, no matter how little experience or technical knowledge you currently have. The web is a very big place, and if you are the typical internet user, you probably visit several websites every day, whether for business, entertainment or education. But have you ever wondered how these websites actually work? How are they built? How do browsers, computers, and mobile devices interact with the web? What skills are necessary to build a website? With almost 1 billion websites now on the internet, the answers to these questions could be your first step toward a better understanding of the internet and developing a new set of internet skills. By the end of this course you’ll be able to describe the structure and functionality of the world wide web, create dynamic web pages using a combination of HTML, CSS, and JavaScript, apply essential programming language concepts when creating HTML forms, select an appropriate web hosting service, and publish your webpages for the world to see. Finally, you’ll be able to develop a working model for creating your own personal or business websites in the future and be fully prepared to take the next step in a more advanced web development or design course or specialization.

À partir de la leçon

Course Overview and Website Structure and Hosting

This first module provides an overview of how websites function, their structure, and the ins and outs of choosing a website name and selecting an online host to house your website. By the end of this module, you'll be able to: find and select a web hosting company; choose an effective domain name; use the host to manage your websites; and discuss how networks and the internet function at a high level.

Module 1 Introduction0:54

What is a Web Hosting Company?4:21

How to Find and Select a Web Hosting Company4:05

Naming a Website2:36

Website Name Registration4:26

Networks and the Internet3:59

First Look at a Website Control Panel4:08

Web Development Tools6:44

Rencontrer les enseignants

Daniel Randall
Senior Architect at Composer Solutions and Instructor
UC Davis Division of Continuing and Professional Education

[MUSIC]

Hi, welcome back.

In this lesson, I want to talk about some basic network ideas.

First, where is a website?

When we type in google.com or amazon.com, or any other website's name,

where does it go to get the information?

For example, if we type in yahoo.com we'll get Yahoo's website.

Our computer finds that information

by requesting that yahoo.com is looked up for us.

And Yahoo is really identified by this long number.

We read this as 209.191.88.254 and it's called an IP address.

IP stands for Internet Protocol.

Now normally,

we do not need to know the IP addresses because they can be looked up for us.

By using yahoo.com, we allow a service called a domain name service or

DNS to find the IP address for us when we use the name.

This way, we never have to know the IP address which would make it much harder

to reach Yahoo or other websites if we actually had to know that number.

This DNS runs on computers associated with our hosting service.

It also runs on computers associated without ISP or smartphone provider.

Now, ISP is who is you use to reach the Internet.

This stands for Internet Service Provider.

And if you're using your smartphone or some other smart device,

it is probably your cellular provider that is also your ISP.

So, this service DNS,

let's us use name rather than a complicated numbers and syntax.

And it also protects us from changes to the IP addresses.

For example, the IP address above the 209.191.88.254

that belongs to a specific piece of equipment owned by Yahoo.

Now, Yahoo can change equipment, add equipment,

change IP addresses as they need to.

But if we have to follow that, it would be very, very difficult for

us to ever reach Yahoo as they made changes.

Instead, if they make changes,

the new correct changes are looked up whenever we use yahoo.com.

So, let's give it a try.

Go to this website and we'll see what we have here.

We have the IP address that I mentioned and I'm going to click Search.

Now this is a Whois Lookup and

it should show me information associated with this IP address.

Now, it's asking here for me to verify that I'm not a robot, meaning it wants to

know that I'm a real person and not a program trying to abuse their site.

So, we'll wait for a moment while it's looking up and

notice here we see lots of information about this IP address.

Now we're not going to read this through, but we can see it belongs to Yahoo.

And we can also see that the location of the IP address,

the physical location, is in Beijing, China.

So, this means that when we're using Yahoo, we might actually be accessing

the server that's in another country or if we're in China in our country.

In this case all this information is hidden from us, so

we don't have to remember it, follow it, write it down that sort of thing.

Whenever we want to access Yahoo and this is true for

any other website we want to access like Google or Amazon.

All of them work based on IP addresses but humans would have

trouble following the IP addresses and keeping track of all the details.

So, DNS lets us use names to hide this complication.

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