Communications, Networks and Internet

1. Communications, Networks and Internet

2. Communication • This growth in communications technology has revolutionized the way the businesses work and keep in touch with staff and customers

3. Method of communication • Telephone • Internet- Facebook, Twitter,Tumblr,Gmail • Skype • Flair • MSN • MySpace • Letter • Sonar • Sounds • Facial expression • ICQ • Text message • BBM • Mix it • OOVOO • Speech

4. Network • A network consists of two or more computers that are linked in order to share resources e.g. exchange files, communicate • The computers on a network may be linked through cables, telephone lines, radio waves, satellites, or infrared light beams • There are 2 types: WAN LAN

5. Local area network (LAN) Supplies networking capability to a group of computers in close proximity to each other such as in an office building, a school, or a home • A LAN is useful for sharing resources like files, printers, games or other applications Advantages: • Software and data files can be shared • Users can work together on a single shared document • Users can communicate e.g. Messenger • Users can stream media, so they can view video and play audio • It saves time and money, to install the software on one main computer • You can share hardware devices and internet connection

6. Types of LAN Client networks: • For those available to you to use Server networks Peer-to-peer networks: • Allows every computer to communicate directly with every other computer in the network • A user can access data from any computer on the network • Is limited to about 10 machines • Found in small businesses and departments

7. Cabled LAN vs. Wireless lan • All computers and other peripheral devices on the network are attached to cables that transmit data between them • A network cable is required • Uses's a wireless link to connect to the network • Slower transmission speed • Has 3 sets of components: • Wireless points • Wireless interface cards • Routers

8. Wide Area Network (wAN) • A large geographic area in a state, province or country • WANs often connect multiple smaller networks • The world's most popular WAN is the Internet • Information can be transmitted in many ways like high-speed telephone lines • The internet, school network, network of bank cash are WANs • LANs are often connected to WANs • WANs can be connected together using the internet, leased lines or satellite links • They are used by large companies, universities

9. Components of a wan • Modem- is a Modulator-Demodulator • 1ST created to take digital signals from a computer and convert them to analogue so that they can be transmitted down a telephone line • Speed at which a modem operates will affect the download time of web pages and files • Data transmission is basically the transmission of data from on location to another for direct use or for further processing • Bandwidthdetermines the volume of data that can be transmitted in a given time

10. What’s the internet • It’s a international network of networks that connects computers worldwide It consist of: • WWW- World Wide Web • Forums where people can seek help and advice about a topic • Research database used by universities and large companies • USENET- discussion groups about a specific subject from the latest boy band to favorite pets e.g. Google Groups • Email and Instant Messaging system • Nobody owns it • Its made up of individual networks that someone has put together and then linked to the internet • The internet is not the same as the WWW

11. Connecting to the Internet-ISP • ISP- Internet Service Provider sells internet access to companies and individuals • It provides web servers which connect to the internet • Isp will provide its customers with a wide range of services…. • Bandwidth options • Email serviced • Web hosting • Online and telephone assistance

12. Dial up or narrow band • The computer dials a phone number to connect to your ISP using a telephone line Broadband • Single cable that can provide cable TV, telephone and internet services • Available over a telephone line or cable or mobile telephone network

13. Connecting to the internet- Hardware • Computer • Internal or external modem or similar device • Satellites • Fibre-optic cables • Radio wave

14. Connecting to the internet-others • Internet address • Every device on the internet has a unique address that identifies it. This address is a number called the IP address • The IP address could be static(it remains the same every time you connect to the internet) or dynamic (a temporary address that changes each time you can connect to the Internet)

15. Connecting to the internet- Software Browser software allows users to view and use the web pages on the internet: • An address bar • And navigation bar • A bookmark/favorites option • A search engine • A history button • A browser setting and internet options e.g. Filtering

16. World Wide Web (WWW) • It’s a multimedia service that runs on the internet • The web consist of hypertext and hypermedia documents • This documents contain hyperlinks to other documents located on the same computer or an another computer in any part of the world • All the information that can be accessed via the internet is often called Cyberspace

17. Components of a wan • The higher the bandwidth, the quicker the data will flow along the line…… • Web pages load quicker • Multimedia is downloaded faster • Internet connection is faster • Less network traffic • Quicker response time

18. Broadband ISND: Integrated Services Digital Network • Supports video conferencing, faxes and voice applications • Users still must dial up • High speed digital transfer • Its permanently switched on

19. Difference between stand-alone and workstation • A stand-alone PC works on its own • A workstation is connected to a network, you can freely share your files and databases to other PC.

20. How can you tell whether a computer is networked to other computers • It allows you to send messages to a friend who is working on another computer • A message will tell you that you are entering a networked system when you logon • You have a choice to chose your printer • You have a file server

21. A file server • Is a powerful computer that runs the network operating system and allows resources to be shared over the networked by other devices and computers connecting to it • These devices could include printers, disks,drives,CD-ROM drives, camera,etc • Must be kept in a cool temperature room • Has to be in a dust free room • Has to be in a secured room

22. Print server • Coordinates printing on the network

23. Bluetooth vs. Wi-Fi • 10 meters • Mobile phones, mouse, keyboards • Simple to use • Low cost • Developed in 1994 • Notebook, PC, desktop • 100 meters • More complex • High cost • Developed in 1991

24. What can you do on the internet and the web • View web pages • Use a search engine to find pages you want • Send and receive email • Shop online (e-commerce) • Bank online (e-commerce) • Gamble online (e-commerce) • Access customers support • Software download and distribution • Access and discuss information via mailing lists, bulletin boards and new groups • Chat online • Video conferencing • Online radio • Web broadcast • Set up your own website or blog or wiki • Social networking

25. Research on any 2 of the following: Online shopping Online banking Web broadcasting Social networking sites Discuss the disadvantages and advantages Discuss the impact on society

26. Social networking sites

27. Social networking • It's the way the 21st century communicates today • Social networking often involves grouping specific individuals or organizations together • There are a number of social networking websites that focus on particular interests • You can become a member to any website, no matter what their hobbies, beliefs, or views are • You communicate with new people and old friends, so you can stay connected

28. Advantages of social network • It's cheaper to use online social networking for both personal and business use because most of it is usually free e.g. Facebook • A social networking site can be a good way to make connections with people with similar interests • Meeting people and staying connected with classmates and friends is a huge benefit of social networking sites • It can be a great way to understand and stay connected to your community as a whole

29. Disadvantages of social network • Social networking sites such as  MySpace, Face book , and twitter offer even less security and protection because they are open to anyone • Students often post detailed and specific information on Facebook e.g. phone numbers, addresses • You can be easily stalked by strangers

30. Impact on the society with social networking • Students are getting in trouble with University administrators for inappropriate information or pictures on their social networking profiles that are violations of school policy • Students are being turned down by employers for jobs, internships and even interviews because of the information employers are finding out about students on their social networking accounts • Employers take the images that students are portraying on social networking sites very seriously as a reflection of personal character

31. Online banking

32. Advantages of Online Banking Convenience • Online banking sites never close • They are available 24 hours a day and seven days a week Ubiquity • If you're out of town or even out of the country and you have no money, you can log on immediately to your online bank and get money Efficiency • You can access and manage all of your bank accounts, including IRAs, CDs, even securities, from one secure site.

33. Disadvantage of Online Banking Start-up • If you want to register for your bank's online program, you will need a ID and sign a form at a bank branch Learning • Banking sites can be difficult to navigate at first • You need to take your team and read everything

34. Impact on online banking Since many people use online banking, many people can hack into their accounts and steal money. This increased the number of crime.

35. Facebook • Today there are more than 800 million active users • 50% of active users log on to Facebookevery day • People spend over 700 billion minutes per month on Facebook • There are more than 250 million active users accessing Facebook through their mobile devices • People that use Facebook on their mobile devices are twice as active on Facebook than non-mobile users

36. Facebook-Popilarity In this graph you can see that in 2004 many people used Facebook but in 2006-2011 the number of facebook users increased rapidly and in 2011 Facebook had 800 million users

37. Facebook-Users by age • In this graph you can see that older people with the age of 55-64 only spent 5% in Facebook • While people with the age of 14-34 spent 26% in Facebook

38. Total active users in Facebook As you can see in the graph and table the number of users increased by 100 every year

39. Advantages of Facebook • Its free and it's one of the best medium for communication • Gives you the chance communicate with any of our old friends • Youcan share what's happening around your daily life • Has good privacy setting which gives you the option to customize according to your wish • Online games are really popular and addicting • Has thousands of application, quiz and games • The “like button” is connecting their user to every other website

40. Disadvantages of Facebook • You get addicted - kills your valuable time • Fake profiles – people pretend to be someone they are not • There are many groups that are being created to abuse or violate other religion , personalities , nation etc • Often brings bad effects on students results- Students who are Facebook addicted fail their exam or have bad results • Facebook chat doesn't work properly. User often have trouble while chatting in Facebook

41. Bibliography • Facebookhttp://en.wikipedia.org/wiki/Facebook