Transcript The Internet Powerpoint

Cloud, Internet,
and Browsers
Filezilla Checklist
 ISIS
access
 COMP101 file on your computer
 FILEZILLA installed
Saved
Set
passwords and certificate
up bookmarks
Exercise 1
Move the index.html page
From
public_html on ISIS
to COMP101 on your computer
From COMP101 on your computer
to public_html/COMP101 on ISIS
Repeat the last step
The Cloud
The cloud is …
 Poll
Everywhere!
 Poll:
pollev.com/dianepozefsk778
 Responses
Is the cloud ethereal?
 Heck
no!
 Cloud =
Data
stored many places
Data
easy to access interface
The Cloud (A Brief History)
 Concept
 First
 Not
 All
as old as computers
descriptions 1950s
interesting until
people had GOOD access
Early Computers

Every company had a “private cloud”
Today

Internet and cell phones wide-spread


Web services


NOT ubiquitous
Anything that you want to do is probably on the web
If you store it,

“they” can read it

Anyone can copy it


People sometimes try to block it

But always a way to get around it
It’s probably archived somewhere

And may never go away!
Internet
What is the Internet?
 The
machines
 The connections
 The content
The Internet in 1980
The Internet Circa 1998
What made the Internet succeed?

Early users shared information



Command lines
1993: Browser invented!

Mosaic

Marc Andressen
Brought

Graphical Interface

Easy access

No technical skill needed
Browsers
Viewing a Web Page
SERVER
web page repository
WEB PAGE
instructions stores
information and
instructions
2
Web
Server
Pages
Server
1 3
BROWSER
retrieves web page and
follows instructions
Browser
Client
Viewing a Web Page
SERVER
web page repository
WEB PAGE
instructions stores
information and
instructions
2
Web
Server
Server
1 3
BROWSER
retrieves web page
and follows instructions
Pages
Browser
Client
What is http and https?

HyperText Transfer Protocol

Protocol: set of rules

Transfer: move it from one place to another

Hypertext: the essence of the web – the links

HTTPS is the secure version

Tells the browser that it has to go to the internet to find it
Retrieving a web page
 You
type the URL
 How
 Up
does your computer find it?
to the first slash is the SERVER name
 Everything
after that is inside of
public_html!
Just
At
follow the folders
the end, get to a file
Routing: Getting to the Server



Server names don’t tell me where anything is

They DO tell me who gave them the name

cs.unc.edu:

organization that manages edu gave the university unc

Unc gave the department cs
Translate the name to a number called the IP address

Example: 149.72.62.234

Each value ranges from 0 to 255!
Translation is done through a table called the Comain Name System
(DNS)
Browser Instructions
What do the instructions look like

Open Chrome

We want to look at a page

View Page Source

Only TEXT

Even though the page has a picture on it!
Web Instructions: Three Legs
HTML
Content
CSS
Presentation
JavaScript
Behavior
Creating HTML

All we have to do is edit a page

CANNOT use a word processor

Word, Pages, Writer

Why? They add all sorts of gorp

Do NOT need special software

We WILL use it: Komodo Editor

It HELPS
Using Komodo Edit
Exercise 2

Open Komodo Edit

Create a project:

direct access to your COMP101 file

Load index.html

Change the text

Save it

Look at it

Move it back to isis

Look at it there