The College of Saint Rose CIS 111 – Introduction to Computer Science David Goldschmidt, Ph.D. from Fluency with Information Technology, 4th edition by Lawrence Snyder, Addison-Wesley, 2010, ISBN

 The Internet (1969) is a network that’s  Global  Decentralized  Redundant  Made up of many different types of machines  What do we use the Internet for?  How many machines make up the Internet?

 Synchronously  Sender and receiver are active at the same time  Sending and receiving occur (almost) simultaneously  Asynchronously  Sending and receiving occur at different times

 Messages are divided into individual packets

 Internet revolution (1990s/2000s)  Sir Tim Berners-Lee

 The World Wide Web (or just Web) is:  Global  Decentralized  Redundant (sometimes)  Made up of Web pages and interactive Web services  How many Web pages are on the Web?

 Three key building blocks of the Web:  Uniform Resource Locator (URL)  HyperText Transfer Protocol (HTTP)  HyperText Transfer Markup Language (HTML)  The original intent of the Web was to provide a networked medium to share information

 Read Chapter 3  Do all of the Multiple Choice and Short Answer questions