ditec - expose yourself to internet & e-mail (second update)
TRANSCRIPT
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?
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!
What is the Internet?
A computer connected to a internet is know as a Host
What is the Internet?
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
Facts about Internet…
Mobile broadband Internet subscriptions in 2012
Facts about Internet…
Website content languages
Facts about Internet…
Internet censorship by country
Facts about Internet…
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
Packets
Packets
Routers
Fault Tolerance
Fault Tolerance
TCP
TCP
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
HTTPS
HTTPS
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
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!
Security Concerns on Internet
Hacker Attacks!
Security Concerns on Internet
Spyware!
Security Concerns on Internet
Spam!
Privacy on Internet
Know what you share with whomKnow the genuine websitesUse strong passwords
The End
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