Information Technology, Engineering Faculty

UNIM

Internet & Web Application

Academic Year: 2014-2015

UNIM

(2nd Week)

2Overview

Internet and Web

Markup Language

Internet and Extranet

Internet Connection Option

3Web (1)

WEB = World Electronic Broadcast

WWW

The World Wide Web (www, W3) is an information system of interlinked hypertext documents that are accessed via the Internet.

The inventor of the Web Tim Berners-Lee, a British computer scientist and former CERN employee

Proposal : On 12 March 1989

Completed Test : Around 20 December 1990

Reported Project : on 7 August 1991

4Web (2)

The Web

An infrastructure of information combined and the network software used to access it

Web page

A document that contains or references various kinds of data

Links

A connection between one web page and another

5Web (3)

WebsiteA collection of related web pages

Web browserA software tool that retrieves and displays eb pages

Web serverA computer set up to respond to requests for web pages

Uniform Resource Locator (URL)A standard way of specifying the location of a Web page, containing the hostname, "/", and a file

6Web (4)

Definition

Page of information provided via the Internet that can be accessed around the world for the network connected to the Internet

Type of Web

1. Static Web

2. Dynamic Web

3. Interactive Web

7Web (5)

Static Web

A static website contains Web pages with fixed content. Each page is coded in HTML and displays the same information to every visitor. Static sites are the most basic type of website and are the easiest to create.

Dynamic Web

Dynamic websites contain Web pages that are generated in real-time.

When a dynamic page is accessed, the code within the page is parsed on the Web server and the resulting HTML is sent to the client's Web browser.

8Web (5)

Interactive Web

An interactive website is an Internet page that uses various software to create an interactive experience that allows the person viewing the webpage to be actively engaged with the site.

In general, an interactive website will use the standardgraphical user interface (GUI) present on all websites to create interactivity with the viewer.

9Internet (1)

Definition

The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite (TCP/IP) to link several billion devices worldwide.

Inventor

J.C.R Licklider and his friend (Vint Cerf

and Robert Kahn)

MIT (Massachuet Institute of Technology)

Concept : 1962

Modernization : 1991

10

Internet (2)

Internet Grows Exponentially

Source : http://navigators.com/stats.html

11

Internet (3)

Advantages

The Internet provides opportunities galore, and can be used for a variety of things. Some of the things that you can do via the Internet are:

E-mail

Access Information

Shopping

Online Chat

Downloading Software

12

Internet (4)

Disadvantages

There are certain cons and dangers relating to the use of Internet that can be summarized as:

Personal Information

Pornography

Spamming

13

Layered System View

14

Markup Language (1)

Definition

Markup languages are designed for the processing, definition and presentation of text.

The language specifies code for formatting, both the layout and style, within a text file.

The code used to specify the formatting are called

tags.

HTML (Hyper Text Markup Language, 1980) is a an example of a widely known and used markup language.

Inventor

William W. Tunnicliffe at a conference in 1967

15

Markup Language (2)

HTML

Example of the classic Hello world program

16

Intranet & Extranet (1)

Intranet Internal company network that uses Internet standards (HTML, HT

TP & TCP/IP protocols) & software

Accessed only by authorized persons, especially members or employees of the organization

Extranet Extranet is an Intranet for outside authorized users using same int

ernet technology.

Inter-organizational information system.

enable outsiders to work together with companys employees.

open to selected suppliers, customers & other business partners

17

Intranet & Extranet (1)

Intranet Internal company network that uses Internet standards (HTML, HT

TP & TCP/IP protocols) & software

Accessed only by authorized persons, especially members or employees of the organization

Extranet Extranet is an Intranet for outside authorized users using same int

ernet technology.

Inter-organizational information system.

enable outsiders to work together with companys employees.

open to selected suppliers, customers & other business partners

18

Intranet & Extranet (2)

Intranet : Advantages and Disadvantages

Advantages Security from outside users Relatively cheap to set up Quick access to information Easy and cheap to post information Increase in productivity

Disadvantages Security from within New budget Cost of training Cost of maintaining Separate software might be needed for internet and e-mail

19

Intranet & Extranet (3)

Intranet : Advantages and Disadvantages

Advantages

Automation

Time Saving

Information Updating

Disadvantages

Comparatively more expensive.

The security can be a major issue in case of extranets as well.

20

Internet Connetion Option (1)

Description As technology grows, so does our need for bigger, b

etter and faster Internet connections.

Over the years the way content is presented via the Web has also changed drastically.

Ten years ago being able to center, bold, and produce text in different colors on a webpage was something to admire.

Today, Flash, animations, online gaming, streaming video, database-driven websites, ecommerce and mobile applications (to name but a few) are standards.

21

Internet Connetion Option (2)

Kind of Internet Connection

1. Analog: Dial-up Internet Access, Speeds range from 2400 bps to 56 Kbps. Today, analog has been widely replaced by broadband (Cable and DSL).

2. ISDN - Integrated Services Digital Network, Integrated services digital network (ISDN) is an international communications standard for sending voice, video, and data over digital telephone lines or normal telephone wires. Typical ISDN speeds range from 64 Kbps to 128 Kbps.

3. B-ISDN - Broadband ISDN, similar in function to ISDN but it transfers data over fiber optic telephone lines.

4. DSL Digital Subscriber Line, uses existing 2-wire copper telephone line connected. The two main categories of DSL for home subscribers are called ADSL and SDSL. Speeds range from 128 Kbps to 9 Mbps.

5. ADSL - Asymmetric Digital Subscriber Line, speed rates from 1.5 to 9 Mbps when receiving data and from 16 to 640 Kbps when sending data. ADSL requires a special ADSL modem.

6. ADSL+2 - ADSL Extension, significantly faster download speeds when compared to traditional ADSL connections. most commonly offered in highly-populated metropolitan areas .

7. SDSL - Symmetric Digital Subscriber Line, Supports data rates up to 3 Mbps. Supports the same data rates for upstream and downstream traffic.

8. VDSL - Very High DSL, the shorter the distance, the faster the connection rate.

22

Internet Connetion Option (3)

9. Cable - Broadband Internet Connection, speeds range from 512 Kbps to 20 Mbps.

10. Wireless Internet Connections, the newest Internet connection types. It is typically more expensive and mainly available in metropolitan areas.

11. T-1 Lines Leased Line, Popular leased line option for businesses connecting to the Internet and for Internet Service Providers (ISPs) connecting to the Internet backbone. Supporting data rates of 1.544Mbps. A T-1 line actually consists of 24 individual channels, each of which supports 64Kbits per second.

12. Bonded T-1, A Two or more T-1 lines that have been joined (bonded) together to increase bandwidth. Two bonded T-1s allow to use the full bandwidth of 3Mbps where two individual.

13. T-3 Lines Dedicated Leased Line, Dedicated phone connections supporting data rates of about 43 to 45 Mbps. A T-3 line actually consists of 672 individual channels, each of which supports 64 Kbps. Speeds ranging from 43 to 45 Mbps.

14. OC3 - Optical Carrier, Short for Optical Carrier, level 3 it is used to specify the speed of fiber optic networks conforming to the SONET standard. OC3 is typically used as a fiber optic backbone for large networks with large voice, data, video, and traffic needs. Speeds are 155.52 Mbps, or roughly the speed of 100 T1 lines.

15. Internet over Satellite, Allows a user to access the Internet via a satellite that orbits the earth. IoS is slightly slower than high-speed terrestrial connections over copper or fiber optic cables. Typical Internet over satellite connection speeds (standard IP services) average around 492 up to 512 Kbps

Finish