1. CISC103 Web Development Basics: Web site:
All assignments and information is posted on web site
All assignments must be submitted via sakai
All labs Are due Thursday at midnight
All Homeworks are due Sunday at Midnight
unless otherwise noted
INSTALL Notepad++ or Text Wrangler on your COmputer

2. Intro to the Internet Internet: a network of network
The internet consists of thousands of smaller networks
They may be educational, commercial, nonprofit, military organizations, etc.

3. Brief History Internet History
Began with 1969’s ARPANET for US Dept. of Defense
62 computers in 1974
500 computers in 1983
28,000 computers in 1987
Early 1990s, multimedia (www) became available on internet

4. How Does the Internet Work?
Protocols
set of rules
Internet uses TCP/IP
Rules used for all internet transactions
Base protocol on which all other protocols are built

5. How Does the Internet Work?
TCP
Deals with Transfer of Data
how it is broken up and reassembled to be sent across the internet
Packets
Fixed-length blocks of data
Files are broken up into packets
Not all packets from the same file follow the same path
Data is reassembled at the other end
IP Addresses
Internet Protocol Address – a unique address that identifies every computer and device connected to the internet

6. Key Internet Model: Client/Server Model Built ON Top Of TCP/IP
Client: a computer requesting data or services
Server: a host computer, a central computer supplying data or services requested of it
Services can be requested over the internet
E.g., Check your bank account
Getting
Downloading Web page
Often multiple clients share the services of one server

7. WWW The World Wide Web: uses client-server model client : Your browser
Browser requests web page from web server,
When it gets the web page, it displays the web page
Server: a computer or set of computers (ELSEWHERE) that gives web pages to clients.
Client (browser) requests Web pages, images, sounds, movies, etc from Server.
If Server can locate it, it sends it back to browser
If it can’t locate it, it sends back an error

8. WWW Browsers do two key things:
Locate web sites via unique addresses (URL)
Read web pages and display them (displays html code, css, javascript, etc.)

9. WWW: URL http://www.udel.edu/fall13/webfile.HTML URL
A website’s unique address
It consists of
The web communication protocol, http
The domain name of the web server
The directory or folder on that server
The file within the directory, including optional extension
protocol
domain name
directory
file name . extension

10. Clients, Servers and the Web
HTTP:
The internet protocol used to access the World Wide Web
rules that govern communication between a web client and a web server
Stands for HyperText Transfer Protocol
HTTPS
The secure version of HTTP

11. The Web HTML Hypertext links connect one web document to another
The language used in writing and publishing web pages
The set of tags used for formatting and linking to other documents on the web
NOT a programming language (but it can contain programming code)
Hypertext links connect one web document to another

12. Other Terms CSS – Javascript Cascading Style Sheets
used for styling web page
HTML is for formatting
CSS is used for styling
Javascript
Client-side scripting language
Not stand-alone, but an add-on to HTML
Most popular scripting language L