Data types

• What is a Network?

  A collection of computer equipment such as terminals, computers, printers, etc. that allow users on a system to share hardware, software and data.
• Types of Network

  • Lan - Local Area Network
  • Man - Metropolitan Area Network
  • Wan - Wide Area Network
• Local Area Network (LAN)

  A network within the same area, although they do not have to be in the same building.
• Types of lan

  wireless router

  • Tablet
  • Smartphone
  • Laptop
  • Printer
• Metropolitan Area Network (MAN)

  Falls between a LAN and a WAN; it can span several buildings, and possibly into other cities.

  Used by large companies, universities and stores that occupy several office blocks or occupy large areas of land.
• Types of Man

  Man

  • Hospital Lan
  • School Lan
  • College Lan
• Wide Area Network (WAN)

  Consist of several LANS and can connect computers across cities, states and even countries;

  ⬩Example of WAN is the INTERNET (WWW)
• Types of Wan

  • London
  • America
  • India
• Mobile Network

  • These networks use cells because radio frequencies are a limited, shared resource; It is distributed over land areas called cells;

  • Each cell is served by at least one fixed-location transceiver (main communication point);

  • Cell-sites and handsets change frequency under computer control and use low power transmitters so that the usually limited number of radio frequencies can be simultaneously used by many callers with less interference.
• MOBILE NETWORKS: 1G TO CURRENT

  G stands for generation. It is a Mobile communication evolution.
• 1G

  • Analog
  • No sms
  • Introduced 1980s
• 2G

  • 1st digital network
  • Allows you to make voice conference calls and MultiMedia feature
  • MMS (Multimedia Messaging Service);• SMS (Short Message Service also commonly referred to as a “text message”);• Introducing GSM (Global System for Mobile Communications);
  • Introduced early 90s, on GSM data available using dial-up, later GPRS (General Packet Radio Service) introduced.
• 3G

  • Provides video calling and all 2G service with upgraded versions with high speed;
  • Higher data speed; Video call possible; Introduced late 90s;
• 4G

  • Offers better speed that accommodates for live steaming;
  • You can watch live TV on internet.
• 4G Lite

  • LTE (Long term evolution)
  • An upgraded version of 4G network;
  • Provides better speed and coverage than 4G network.
• Bluetooth

  ⬩ A wireless short-range communications technology standard found in millions of products we use every day – including headsets, smartphones, laptops and portable speakers.

  ⬩ It works by using radio waves instead of wires or cables
• Wi-Fi

  ⬩ A facility allowing computers, smartphones, or other devices to connect to the Internet or communicate with one another wirelessly within a particular area.
• Hotspot

  ⬩ Wireless access points, typically in public locations that provide internet access to mobile devices such as your laptop or smartphone when you are away from the office or your home.

  ⬩ Typical Wi-Fi hotspot venues include cafes, libraries, airports, and hotels.
• Level of Privacy

  Intranet

  Extranet

  Internet
• Intranet

  • Allows for restricted access to only members of an organization;
• Extranet

  • Can be viewed as part of a company’s intranet that is extended to users outside the company, usually via the Internet. Allows non-members such as suppliers and customers to use company resources
• Internet

  • A global system of interconnected computer networks that use the standard Internet Protocol Suite (TCP/IP) to serve billions of users worldwide.

  Generally allows everyone to access all network resources.