Unit 3

1. Unit 3 Communications, networks and internet

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

3. Communication • Forms of communication E-Mail Social Networking Face To Face Talking Drums Sign Language Flares Morse Code Video Conferencing Telephone

4. Network What is a Network? • A network is the connection of two or more electronic devices using wires or it may be wireless enabling them to share files and data • A computer not connect to a network is a stand alone.

5. Types of Computer Network • Local Area Network (LAN) • Wide Area Network (WAN) • The INTERNET • Intranet • Extranet

6. LAN • If you are connection to a LAN you can still work outside of the LAN. You can work independently • A LAN is a connection of computers that can share resources on a network. • For a workstation to share or access the internet, it must be connected to a network.

7. WAN • Wide area network. • They are expensive and can spread round a large area.

8. Components of a WAN • Data Transmission – it’s the transmission of data from one location to another for direct use or for further processing. • Narrowband- for data transmission over a telephone line using an analogue modem that can transmit data. • Broadband – Asymmetric Digital Subscriber Line, it is probably switched on.. No need for dial up

9. LAN’s $ WAN’s • The internet is a connections of LAN’s and WAN’s. • A network of bank cash dispensers is a WAN. • A school network is usually a LAN • A WAN is made up of LAN’s

10. What is the Internet • The internet is an international network of networks that connects computers worldwide. • It consists of: - WWW – World wide Web - Forums where people can seek help and advice about a topic -Research databases used by universities and large companies - USENET : discussion groups about a specific subject from the latest boy band to favorite pets - Email and Instant Messaging Systems

11. Internet to ISP • An ISP (Internet Service Provider) sells internet access to companies and individuals • It provides web servers which connects to the internet • An ISP will provide its customers with a range of services … • Bandwidth options • Email service • Web Hosting • Online and Telephone Assistance

12. Internet - ISP • Dial up or narrow band • Is when the computer dials a phone number to connect you to your ISP using a telephone line. • Broadband • A single cable that can provide cable TV, telephone and Internet services • Available over a telephone line or cable, or mobile telephone network.

13. WWW • The World Wide Web is a multimedia service that turns on the internet. • The web consists of hypertext and hypermedia documents. • This document contains hyperlinks to other documents located on the same computer or on another computer in any part of the world. • All the information that can be accessed via the internet is often called Cyberspace

14. Uniform Resource Locators • Uniform Resource Locators are the full forms of URL • Example http://press2reset.com/wp-content/uploads/2011/11/Fifa12Screen3.jpg • TypeOfResource://HostComputer.Domain/Directors/SubDirectoty/Filenam.Extension • E.g. http: or mailto: e.g. www.cislagos e.g. .com e.g./students e.g. / exams e.g./timetable e.g./ doc = • http://www.cislagos.com/students/exams/timetable.doc

15. File Names And Extension • A Graphics file timetable.doc • Microsoft Word: timetable.doc • Microsoft Excel: timetable.xls • Microsoft power Point: timetable.pptx • Microsoft Access: timetable.dbs • A text editor: timetable.txt • A Zipped File: timetable.zip

16. What Can You Do On The Internet And The Web • View Web Pages • Use A search engine to find what you want • Send And Receive E-Mail • Use Online Shopping (e-commerce) • Use Online Banking (e-commerce) • Customer Support • Access Customer Support • Software Download and distribution • Access and discuss information via mailing lists, bulletin boards and news groups • Chat Online • Video Conferencing • Web Broadcasting • Set up your own website, blog or wiki

17. Online Shopping What Is Online Shopping? • Online Shopping is a form of e-commerce where the consumers directly purchase items or services from a seller over the internet without immediate service. What Is Its Effect And Function On Society

18. Online Shopping Advantages And Disadvantages: • Advantages:1. you can do home/office/school/everywhere with Internet connection.. shopping2. the shops available is worldwide and open 24hour3. should be cheaper if not look at delivery fees4. free parking, free of traffic jam. no need ques up at counterDisadvantages:1. Personal privacy and security (BIGGEST!!)2. Delivery fees... May cost more than the things you purchase..3. What if purchased good get is not good, return back? delivery fees again...4. Can't inspect goods before purchase

19. Social Networking • Social networking is the grouping of individuals into specific groups, like small rural communities or a neighbourhood subdivision, if you will. • Social networking is based on a certain structure that allow people to both express their individuality and meet people with similar interests. This structure includes having profiles, friends, blog posts, widgets, and usually something unique to that particular social networking website

20. Pros Of Social Networking • The Pros Of Social Networking Sites • The best advantage of social networking sites is that these sites allow you to keep in touch with your friends, classmates, and relatives. It is also the most cost effective way to keep in touch with your people. • These sites allow you to send and receive messages, upload photos, and videos. As such, they are very interactive as you can get to see what your friends and relatives are up to. • With social networking sites, you are not bound by any geographical and cultural differences. You get to meet and know a variety of people whose interests are similar to your own. These sites are a window to different cultures and places. • You can build a network of contacts and interact with a lot of people at the same time. As such, you can spread your thoughts and interests to a large number of people. • The social networking sites also facilitate you to procure information on any subjects from anywhere. These sites also make it easier and faster to collect the information. • Social networking sites can also be a tool to promote your business, services, products, or websites. Due to the huge number of people who regularly use networking sites it has found huge • rs. 

21. Cons Of Social Networking • The Cons Of Social Networking Sites  • The most glaring disadvantage of social networking sites is the risk of identity theft and fraud. The personal information of users can be used by dubious people for illegal activities. Information like the e-mail address, name, location, and age can be used to commit online crimes. • Also, many people pretend to be someone else and prepare their online profiles with false information, so as to dupe unsuspecting users. So, if you do not know the person face to face then it will be very hard for you to find the real identity. • Another cause of concern is cases of online harassment and stalking. Since the social networking sites, are very poorly regulated so it can be a very fertile ground for people trying to get even with you.

22. Threats from The Internet and Security • There are many threats to safe use of the internet. These are some of the threats: • Viruses • Spam • Phishing • Bluesnarfing • Farming

23. Viruses • A virus is a software that is designed to be secretly loaded unto a computer without the users knowledge for malicious intent. • Viruses have many forms and you do not want any form of virus on your computer. Viruses are capable of: • Typing the same character no matter which key is pressed • Deleting every data on a hard disk • Crashing computers • Viruses are transmitted by downloading programs or accessing backing storage • Antivirus Software can check a computer for viruses and remove them

24. Spam • A spam is an unsolicited email and is the equivalent of junk mail. • It is an inappropriate attempt to use an email address or other networked communications facility as a means of broadcasting the same email to a large number of people who didn’t ask for it • Spam's mostly contain pornography and viruses making the use of email difficult and time consuming • Spam can be removed using a spam filter however they are not entirely accurate and can delete some of your mails while trying to delete the spam

25. Phishing • Phishing is an attempt to find out personal, usually social security number, credit card numbers, or usernames and passwords for online banks • Phishing attacks are usually made by email.

26. Bluesnarfing • Bluesnarfing is the art of hacking a Bluetooth connection. • This allows access to a calendar, contact list, emails and text messages, and on some phones users can copy pictures and private videos. • Currently available programs must allow connection and to be 'paired' to another phone to copy content.