MODULE 3

• Internet Service Provider (ISP) - is a company that provides customers with Internet access
• Simple Mail Transfer Protocol (SMTP) - This is the protocol used for sending e-mail over the Internet
• Post Office Protocol (POP) - is a type of computer networking and Internet standard protocol that extracts and retrieves email from a remote mail server for access by the host machine.
• Internet Message Access Protocol (IMAP) - is a standard protocol for accessing email on a remote server from a local client.
• Wide Area Network (WAN) - a large network of information that is not tied to a single location
• TCP/IP (Transmission Control Protocol/Internet Protocol) - standard Internet communications protocols that allow digital computers to communicate over long distances.
• IRC- Internet Relay Chat (IRC) is a system for chatting that involves a set of rules and conventions and client/server software.
• HTTP (Hypertext Transfer Protocol - Stands for "Hypertext Transfer Protocol." HTTP is the protocol used to transfer data over the web.
• A web application is a computer program that utilizes web browsers and web technology to perform tasks over the Internet. Web technology refers to how computers communicate with each other using markup languages and multimedia packages
• The Internet is a global connection of computers
• THE INTERNET USAGES

  • Exchange of data, news, and opinion.
  • Upload and download files
  • Electronic Mail (E-Mail)
  • Communicate and socialize
  • Marketing
  • Online banking
  • Online shopping
  • Entertainment
• The Internet Requirements

  • Computer with modem/network card
  • Internet connection
  • Account with Internet Service Provider (ISP)
  • Web browser – Example: Internet Explorer, Firefox, Opera
  • 3rd-party software – Example: Flash player, QuickTime Player, Adobe Reader • Internet Connection
  • To gain access to the internet, the user must register with any Internet Service Provider (ISP).
  • Types of Internet connection: – Dial-up – Integrated services digital network – Asymmetric Digital Subscriber Line – Wireless Internet Connections – Internet over Satellite
• Internet Connections Types

  Dialup is naturally the slowest type of connection to the Internet. It runs over analog telephone lines, and its speed is limited by the quality of these lines, which were designed for low-quality voice calls, not data transmissions. Dialup relies on modems (modulator-demodulators), which max out at 57600 bps (in practice, 53000 bps).
• Internet Connections Types

  ISDN (Integrated Services Digital Network) is a digital connection over a conventional telephone line.
• Internet Connections Types

  DSL (digital subscriber line) sends signals at a higher frequency than voice signals over telephone lines. It offers high speeds, but bandwidth degrades as the length of the telephone line increases from the modem to the telephone company's central office
• DSL comes in two flavors:

  ADSL - Asynchronous DSL means that uploading is much slower than downloading. Internet service providers (ISPs) adopt this technology so that they can spend less on bandwidth and so that they discourage users from running bandwidth-intensive servers.
• DSL comes in two flavors:

  SDSL - Synchronous DSL provides equally fast upstream/downstream bandwidth. SDSL is expensive and generally used by businesses hosting web servers
• Internet Connections Types

  Cable uses a television coaxial cable to connect to the Internet.
• • Satellite also comes in two types:

  Modem-Satellite - A modem is used to send upstream data requests, while a dish receives data from a satellite. This method is plagued by latency, as it takes a long time for a request to travel via dial-up to the web server in question, and for the response to arrive through the satellite system.
• • Satellite also comes in two types:

  Satellite two-way - The satellite dish sends and receives data. This technology is more recent but still suffers from latency problems, simply because satellites are far away.
• 3G and 4G

  • Available for mobile phones, computers, and tablets
  • Connects wirelessly through 3G/4G provider
  • Can access the Internet anywhere
  • Slower than DSL and Cable connection