Review of Chapter 2

Important concepts – The Internet is a worldwide collection of networks that links millions of businesses, government agencies, educational institutions, and individuals – Many home and small business users connect to the Internet via high-speed broadband Internet service Cable Internet service: through cable television network DSL: using regular copper telephone line Dial-up: using standard telephone lines Fiber to the Premises (FTTP): through fiber-optic cable Fixed wireless: using dish-shaped antenna to send signals Cellular Radio Network: using cell phone wireless modems Wi-Fi: using radio signals Satellite Internet Service: via satellite

Important concepts – An access provider is a business that provides individuals and organizations access to the Internet free or for a fee ISP: Provide access to the internet OSP: Provide access to the internet AND some member-only features Wireless internet service provider: Provide wireless access to the internet – A web browser allows users to access Web pages and Web 2.0 programs. Components of a web page – Link(Hyperlink): build-in connection to other web page or part of the web page – URL(Uniform Resource locator): Consists of a protocol, domain name, path to the web page or web application

Important concepts – Practice Figure out the protocol, domain name and path to the web page in following url: – – Use search engine Search engine: Finds information related to a specific topic Subject directory: Classifies Web pages in an organized set of categories

Important concepts – Types of web sites Blog: informal web site consist of time-stamped articles, or posts,in a diary or journey format. Wiki: Collaborative web site that allows users to create, modify or delete the web site content via their browser Online social network: Encourage users to share their ideas or life experiences to other users. Web application: web site allows users to access and interact with software through web browser or any computers or devices that connected to a network

Important concepts – Multimedia A graphic is a digital representation of nontext information – BMP, GIF, JPEG, PNG, and TIFF Animation is the appearance of motion created by displaying a series of still images in sequence Audio includes music, speech, or any other sound Compressed to reduce file size Streaming is the process of transferring data in a continuous and even flow Video consists of images displayed in motion Virtual reality (VR) is the use of computers to simulate a real or imagined environment that appears as a three- dimensional space A plug-in is a program that extends the capability of a Web browser

Important concepts – E-commerce is a business transaction that occurs over an electronic network Business-to-consumer (B2C) – Example: Apple application market, Steam, Amazon Business-to-business (B2B) – Online transactions between visa and amazon.com Consumer-to-consumer (C2C) – ebay

Important concepts – A mailing list is a group of names and addresses given a single name Subscribing adds your name and address Unsubscribing removes your name – Instant messaging (IM) is a real-time Internet communications service – A chat is a real-time typed conversation that takes place on a computer – A chat room is a location on an Internet server that permits users to chat with each other – VoIP (Voice over IP) enables users to speak to other users over the Internet – A newsgroup is an online area in which users have written discussions about a particular subject – A message board is a Web-based type of discussion group – FTP (File Transfer Protocol) is an Internet standard that permits file uploading and downloading with other computers on the Internet An FTP server is a computer that allows users to upload and/or download files using FTP

IP address – An IP address is a number that uniquely identifies each computer or device connected to the Internet The format of IPv4 address (Class A, Class B, Class C) – A domain name is the text version of an IP address Top-level domain (TLD) – A DNS server translates the domain name into its associated IP address