CIS105: Computer Applications & Information Systems Lect. 9 ​

Chapter 9: Internet ​

9.1: Internet History ​

• 1969: University of California Los Angeles (UCLA) created the Advanced Research Project Agency Network (ARPANET)
• 1989: Hypertext Transfer Protocol (HTTP) / World Wide Web (WWW)
• 1993: Hypertext Markup Langauge (HTML)

9.2: Internet and WWW Structure ​

• he internet is a network called the Client/Server Model
• The browser application software interprets HTML and HTTP to create web pages
• Everything on the internet lives somewhere physically; the trick is using computer addresses to send info from one place to another

9.3: Internet Addresses ​

• Internet Protocol Address (IP): An address system used to identify and communicate through the network
• Uniform Resource Locators (URLs)
  • https://asu.edu
  • https: refers to standard protocol
  • www: refers to the world wide web
  • Canvas.asu: domain name
  • .edu: a top-level domain code or extension

9.4/9.5: Websites/Browsers ​

• Website: A collection of web pages on a server that exists on the web that can be requested by a client and displayed with a browser
• Hyperlink: Clickable navigation element
• Browser: An application software that provides an interface for the WWW
• Aspects of a good website:
  • Content
  • Interactivity
  • Design

9.6: Browser Features ​

• Common Browser Features
  • Bookmarks: AKA favorites
  • Caching: Just like a CPU cache on the internet
  • Cookies: Text files used to track info about users
  • Graphics File (GIF, JPEG): Images and videos
  • Javascript: A programming language
    • Used to make websites dynamics; Ex: Countdown timer
• Browser Considerations:
  • Security
  • Popup Blockers
  • Usability

9.7: Internet Service Providers (ISP) ​

• Connectivity: When one computer connects to another and shares info & resources
• Internet Service Providers (ISP)
  • Dial-up & Digital Subscriber Line (DSL)
  • Broadband Internet Access
  • Web Hosting

9.8: Search Engines ​

• Search engine: A website that lets a user type in specific key words or phrases and then return a list of hyperlinks that best match the search criteria
  • Google, Bing, Yahoo
  • Directory searches
  • Metasearch Engines
    • Ex: Dogpile

9.9: E-Commerce ​

• Electronic Commerce (E-Commerce): The distribution, buying, selling, advertising, and marketing of goods and services over the web
  • Business-to-Business (B2B)
  • Business-to-Consumer (B2C)
  • Consumer-to-Consumer (C2C)
• The rules of business still apply to online environments

9.10: Security ​

• Malware: Software designed to damage a computer's system without the owner's knowledge
  • Virus
  • Worms
  • Trojan Horse
  • Spyware
  • Adware

9.11/9.12: Email/Email Security ​

• Email: "A store and forward" system of composing, sending, storing, and receiving message over electronic communication systems.
• Never send an email you wouldn't be willing to say in public
• Phishing: An email that looks official but is malicious in nature
• Spam: Unwanted mail