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The Internet and e-commerce Fundamentals of Information Technology Session 7 The Internet • The Internet is a global WAN – a network of networks • It is based on a client-server network model Hundreds of thousands of web-servers throughout the world provide resources and services to millions of clients • Communication between computers on the Internet largely takes place using the TCP/IP protocol, although other protocols, such as FTP, are also used Data transmission over the Internet – IP and DNS • Each computer on the Internet has its own unique IP address (e.g. 193.61.29.155) • Users can not possibly remember long, abstract strings of numbers like IP addresses • To make it easier to remember, a Domain Name System (DNS) is used to convert IP addresses to domain names • The DNS has a hierarchical structure with several levels – – – – The root domain (Internet root domain) Top-level domains (e.g. .edu, .com, .gov, etc.) Second-level domains (e.g. Amazon, Birkbeck, Google) Third level domains (sales, finance, Home Office) Sending messages over the Internet – IP and DNS Internet root domain *.* ac.uk edu .ac.uk bbk.ac.uk amazon dcs.bbk.ac.uk mycomputer.dcs.bbk.ac.uk 193.61.29.155 org birkbeck gov Home office Top-level domain Foreign office Second-level domain Third-level domain dcs Internet services • The Internet is the actual physical network infrastructure • This infrastructure consists of servers, clients, network devices and cables • It is used to provide a range of services to users: – – – – – Email VoIP Chat/Instant messaging File Transfer Protocol (FTP) World Wide Web (the Web) • Note that the Internet and the Web are not synonymous The World Wide Web • The World Wide Web is a system of inter-linked hypertext documents accessed via the Internet Linear Node Node link link Node link Hypertext link Node Node Node The World Wide Web • Navigation between pages (nodes) on the Web is achieved by adding hyperlinks to web pages • The Web provides a way of locating and acquiring different kinds of media, including: – – – – Graphics Video Animation Documents (e.g. *.doc, *.pdf, *.ppt) Navigating the World Wide Web – URLs • Underlying a hyperlink is a Uniform Resource Locator (URL) • A URL tells a web browser (e.g. Firefox, Internet Explorer) where to look for a specified resource • Clicking a hyperlink sends a HTTP request to the host web server (HTTP is the is the transfer protocol used for the transfer of pages on the Web. It works in conjunction with TCP/IP) • The host web server then sends back a response using the unique IP address of the requesting computer as the recipient address Navigating the World Wide Web – URLs http://www.amazon.com/books/345223.html packet data Host Server (Amazon.com) The Internet Network server Requesting Computer http request including IP address http://www.amazon.com/books/345223.html • HTTP works with TCP/IP to send requests and responses Navigating the World Wide Web – URLs • A typical URL contains: – A reference to the transfer protocol being used – A domain name – A reference to any sub-directory in which a requested resource resides on the web server – The name of the resource being requested Domain name Resource being requested http://www.amazon.com/books/classics.html Transfer protocol Directory on the server Intranets • An intranet is a private network that runs over a private LAN belonging to a business or other organisation • The LAN is the physical infrastructure; the intranet is the collection of hyperlinked resources that are made available over the LAN • Intranets are used to make private or sensitive organisational data available to organisational members, but to shield it from outsiders • Intranets require authentication to enter • Check out and login to the SCSIS intranet at: http://vili.dcs.bbk.ac.uk/intranet/ Intranets Public web pages only Public web pages only External client External client The Internet Public web pages and private intranet pages Company client LAN Web server Company client Company client Company client Valid authentication allows access to intranet pages from inside or outside the company network Company client Public web pages and private intranet pages E-commerce • E-commerce involves buying or selling goods or services over the Internet. This can include amongst other things: – – – – Concrete goods (e.g. cars, furniture, jewellery, etc) Virtual goods (e.g. access to Web content, digital music) Concrete services (financial, insurance, etc.) Digital services (e.g. advertising, internet service provision, webhosting, etc., music downloads) • There are three main categories of e-commerce: – Business-to-customer (B2C) – Business-to-business (B2B) – Customer-to-customer (C2C) Benefits of e-commerce (for customers) • • • • • • Access to a wider choice of goods and services Better product information (price comparison sites) Better access to customer service No need to travel for purchases No time restrictions on doing business Cheaper goods due to disintermediation between self and vendor Benefits of e-commerce (for customers) • Disintermediation removes middlemen and allows customers to aquire goods from manufacturers or wholesalers rather than from retailers. This can significantly reduce costs. Cost Manufacturer Wholesaler Retailer Customer £50 Manufacturer Wholesaler Partial disintermediation Customer £40 Customer £30 Manufacturer Complete disintermediation Benefits of e-commerce (for businesses) • E-commerce allows vendors to reduce their overheads and pass on savings to customers – Savings are made by: • reducing the need for expensive commercial real estate (e.g. high street shops) • Reducing the number of staff required to process a transaction • Reducing the time needed to process a transaction • E-commerce also expands a company’s reach. The Internet allows a global reach beyond geographical boundaries • E-commerce allows business to take place outside of normal time constraints (e.g. 24/7) E-commerce business models • E-commerce is conducted using several different business models. These include: – – – – – – – Virtual storefront Online marketplace Transaction broker Information broker Content provider Online service provider Portal E-commerce business models • Virtual storefront – Sells physical or digital products to individuals or businesses • Online marketplace – Provides a digital environment where users can buy and sell products from one another • Transaction broker – Processes sales transactions and charges a fee each time a transaction occurs • Information broker – Provides product pricing, quality and availability information to users E-commerce business models • Content provider – Generates income by providing digital content such as music, video, etc. • Online service provider – Provides online services for users. Gets income from subscriptions fees, as well as advertising and/or collecting marketing information from users • Portal – Provides focal point of access for users seeking a particular category of product or service E-commerce payment systems • Credit or debit cards account for the vast majority of transaction payments on the Web • Other online payment systems include: – Digital wallet (a system of payment that securely stores credit/debit card details so that they do not have to be repeatedly entered) – Micropayment system (a system that allows for payments too small for debit/credit cards to be made online) – Stored value payment systems (allows users to pay from a prepaid account) – Peer-to-peer payment systems (Allows users to credit a third party internet service so that payments can be made between individuals who do not have the ability to process credit/debit card transactions) E-commerce revenue generation methods • E-commerce sites generate revenue in several different ways – – – – – – Sale of goods services or information Advertising Commission on transactions Commission on referrals Sale of customer information Gambling FIT Session 7 – Activities • Now do – Activity 7 – The internet and e-commerce