Symfony Web Development : Why Businesses should use for web Development ?
Web Development
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WEB DEVELOPMENT Delving into the Internet and Networks
description
Delving into the Internet and Networks. Web Development. In the beginning. ARPANET – set up for the military to have another network of communication Pre-cursor to the internet. HTML. Hyper Text Markup Language Displayed through a web browser Is being replaced by XHTML. XHTML. - PowerPoint PPT Presentation
Transcript of Web Development
WEB DEVELOPMENT
Delving into the Internet and Networks
In the beginning
ARPANET – set up for the military to have another network of communication
Pre-cursor to the internet
HTML
Hyper Text Markup Language Displayed through a web browser Is being replaced by XHTML
XHTML
Extensive Hyper Text Markup Language More specific than HTML Used to allow for XML XML is used to create your own tags
Doctype
Strict Transitional Frameset
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd">
CSS
Cascading Style Sheet Internal or linked Control the appearance of elements in
your web page. Why cascading?
JavaScript
Must activate in Internet Explorer Used with forms for processing
information Used with CSS to animate elements
Cookies
Text file Saved on YOUR computer Used to help keep setting at a website Expiration Date
DOM
Document Object Model
Flash
Good for animations Creates a .swf file Can have anchors/links Embedded into an HTML file Text in Flash movies not searchable
File Types
Files made up of a filename and a file extension separated by a period
myreport.doc
index.html
banner.jpg
file name file extension
Webpage files
use the following extensions .html .htm .php .asp .jsp
Graphic FilesUse the following extensions
File attributes
.jpg .gif
.png .tiff
.bmp
Compressed, basic graphics Compressed, support transparency and
animation Compressed, more colors, alpha channel Not compressed, must have application to
view it Not compressed, basic image, MS Paint’s
default
Other files
.exe – executable files .pdf – acrobat reader .doc – word document .css – cascading style sheet .js – javascript file
Multimedia Files
MPEG – Graphics and Sound .avi – video .mov – quicktime movie .swf - flash movie
Compression Files
Some graphic files are compressed:jpg, gif, png
Other compressionszip (archive)
Protocols
What is a protocol?Just a standard way to do somethingEx: US mail address follows a protocol
○ Persons Name○ Street Address○ City, State, and Zip Code
The internet uses certain protocols for transferring electronic data
HTTP
Hyper Text Transfer Protocol Transfer text, anchors, graphics and
sound Uses port 80
TCP/IP
Used for sending and receiving packets via the internet
Each computer must have a separate and unique IP address
TCP is what the router uses to attach the IP address to packets being sent
IP addresses
Uses Four 3 digit numbers separated by a period
can use the numbers 0 – 255 ex:
172.0.0.1205.52.45.31
DNS Server
resolves domain names to IP addresses This is why you can type in google.com
in the URL and find the site for Google’s search engine
What’s Google’s IP address?
DHCP Server
This server will hand out an IP address to a network computer when it is booted up.
The IP can be changed with RELEASE or RENEW
Set up by your network administrator
IPCONFIG
Let’s you see your computer’s IP settings
Let’s try it
IP Classes
Class AUsed with large businesses and small
countriesSubnet mask : 255.0.0.0
Class BUsed with large businessesSubnet mask: 255.255.0.0
Class CUsed for small businesses and personal useSubnet mask: 255.255.255.0
FTP
File Transfer Protocol Uses Port 21
Email Protocols
SMTP – for out going mail POP3 – for in coming mail
Formats include MIME and Bin Hex and UUEncode
Access
Having rights to connect to a server or folders to FTP
Anchor
Used for Hyper links <a> </a> tags Can include images, text, and image
maps
Tables vs. CSS
Layout of a Web page Tables were the old way
Static, didn’t display as well from one browser to another
CSS was developed to include positioning elements as well as changing the look and feel of text, graphics, etc.Uses the <div> </div> tags for DIViding up
the page into divisions.
Domains
Common names of websitesGoogle.comYahoo.comespn.commurrayschools.org
ISP
Internet Service ProvidersQwest DSL (Direct Sub Link) – Uses
EthernetComcast Cable – Uses Coaxial cable
VPN
Virtual Private Networka tunnel into an network from home
Searches
Search enginesGoogleYahooMSN
use quotations to search for specific phases
Email encoding
Uuencoding Bin Hex MIME
Bandwidth
The amount of data that can be sent through a connection
Safety - Firewall
Firewall set up to block programs from the internet from running on your computer
Virus
– sent in email attachments. Propagates itself when opened.
Worm
– does not have to be run or opened to propagate itself on a network
Trojan
Trojan – You think your running one program, but it’s doing something behind the scenes
Certificate Server
Sends an electronic “certificate” to a computer from the network to tell the computer it is a legitimate program to run
SSL
Secure Sockets Layer HTTPS Encodes the information Used with most online orders
