ditec - expose yourself to internet & e-mail (second update)

Diploma in Information Technology

Module V: Expose yourself to Internet & E-mail

Rasan SamarasingheESOFT Computer Studies (pvt) Ltd.No 68/1, Main Street, Pallegama, Embilipitiya.

Contents1. What is the Internet?2. Benefits of the Internet3. History of the Internet4. Facts about Internet…5. What are the services on Internet?6. How Internet works?7. Binary Signals8. Data Communication9. Packets10. Routers11. Fault Tolerance12. TCP13. What is WWW?14. How to browse Internet?15. Web Browser Software16. Website/Page URL

17. IP Address18. Domain Name System19. HTTP20. HTTP Get Requests21. HTML22. HTTP Post Requests23. Cookies24. HTTPS25. What is Email?26. Types of Email Accounts27. Email Address28. How to use Email?29. Obtaining an Internet Connection30. Types of Internet Connections31. Security Concerns on Internet32. Privacy on Internet

What is the Internet?


The Internet is a global network connecting billions of devices. More

than 100 countries are linked into exchanges of data, news and opinions!


A computer connected to a internet is know as a Host


Once you are connected to the internet, you can communicate and share

Information with each other.

Benefits of the Internet?

Benefits of the Internet

Find InformationShare InformationNewsOnline TV / SportsCommunication (Email / Chat / Video Calls)E-CommerceAnd many more!

Is anybody in charge of the Internet?

History of the InternetYear Milestone

1966 Advanced Research Projects Agency (ARPA) was founded.

1969 ARPANET was born It connected four universities.

1972 First ARPANET international connections to England and Norway.First basic e-mail programs written by Ray Tomlinson for ARPANET

1983 The TCP/IP protocol was introduced.

1984 domain name server (DNS) created. .edu, .gov, .com, .mil, .org, .net, and .int created.

1986 5000 hosts on ARPANET/Internet.

1989 100,000 hosts on Internet.

1990 ARPANET ends. Tim Berners-Lee creates the World Wide Web.

2000 20,000,000 websites on the Internet.

2006 There are an estimated 92 million Web sites online .

2007 1.114 billion people use the Internet according to Internet World Stats.

Facts about Internet…

Internet users in 2012 as a percentage of a country's population


Mobile broadband Internet subscriptions in 2012


Website content languages


Internet censorship by country

What are the services on Internet?

• World Wide Web (www)• Email• FTP• Telnet• News Groups

How information transferred from one computer to another?

Binary Signals

Atoms of the Information

Data Communication

How is data delivered to you reliably?

Requesting a song from the server?

Data travels in less direct fashion

Road Conditions

How you move a ship from a factory to it’s launch?

Packets

Routers

Fault Tolerance

What is WWW?

www is a service on the internetwww allowing users to view information on a

remote computer called web serverwww can be know as a collection of web

pages

How to browse web?

Practical session…Browsing internet using a web browser

softwareSearching information

Web Browser Software

Microsoft Internet ExplorerMozilla FirefoxGoogle ChromeOperaNetscape Navigator

Website/Page URL

http://www.esoft.lk

Domain Name

Domain Extension

Sub Domain

Protocol (Hypertext Transfer Protocol)

IP Address ( Internet Protocol )

Domain Name System

HTTP - HyperText Transfer Protocol

HTTP GET Requests

HTML - HyperText Markup Language

HTTP POST Requests

Cookies

What is Email?

Electronic Mail is an another service on the internet

Electronic Mail is a messaging service

Types of Email Accounts

There are two different Email Account types

Web Based Email AccountsDirect Email Accounts from an ISP

Email Address

[email protected]

Email ID

Domain Name

Domain Extension

How to Use E-Mail?

Practical session…How to get an E-Mail AccountHow to use an E-Mail Account

Email Protocols

IMAP (Internet Message Access Protocol)POP3 (Post Office Protocol 3)SMTP (Simple Mail Transfer Protocol)

Obtaining an Internet Connection

There are several internet service providers in Sri Lanka

Types of Internet Connections

Dial-up ConnectionsISDN (Integrated Services Digital Network)Broadband (DSL / ADSL / Mobile)Leased LinesWi-Fi Connections

Security Concerns on Internet

Virus Attacks!


Hacker Attacks!


Spyware!


Spam!

Privacy on Internet

Know what you share with whomKnow the genuine websitesUse strong passwords

The End

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