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  • 1. The Internet How did the internet develop?
  • 2. How did the internet develop?
    • The internet as we know it today is actually a very large wide area network (WAN) connecting computers and networks around the world.
    • It makes it possible for millions of computer users to connect to one another via telephone lines, cable lines, and statellites
  • 3. Internet was “born” in the late 1960s
    • Advanced Research Projects Agency (ARPA) or the US Department of Defense linked together mainframe computers to form a communications network.
  • 4. The Agency’s main objectives
    • Create a communication system that could survive a nuclear attack or natural disaster
    • Provide communication links to its users in remote locations
  • 5. ARPANet
    • Early version of the internet was known as ARPANet
    • Backbone
      • Is a term used to describe a structure that handles the major traffic in a networked system– much like a major highway
      • Network Backbone
      • is a “cyberspace highway” made up of high-speed cables and switching stations
  • 6. internetworking
    • The process of linking a collection of networks is called internetworking
    • This term is where the internet got its name
    • The term internet was officially adopted in 1983 .
    • More commonly referred to as the Net
  • 7. ARPANet
    • Users originally used the internet to share
      • Scientific and engineering information
    • Other uses discovered
      • Email most popular
    • Expansion into Europe in 1970s
  • 8. ARPANet splits into two parts
    • ARPANet and MILNet
    • MILNet
      • Various defence agencies and the military
    • ARPANet
      • Research and development network
      • International communication tool for the academic community
  • 9. Mid 1980s
    • Speed of ARPANet backbone no longer sufficient
    • National Science Foundation (NSF) created a new high-speed network NSFNet
  • 10. NSFNet
    • Two main objectives
    • To interconnect supercomputing centres so they could access one another’s recources
    • To give academic and research centres access to one another for purposes of exchanging information
  • 11. ARPANet and NSFNet
    • Linked together but NSFNet had a faster backbone
    • By early 1990s NSFNet fully replaced ARPANet
  • 12. Growth of Internet
    • Fueled by purchase of personal computers
    • Growing demand for “anytime, anywhere”
    • NSFNet academics only
    • Bell, AT&T and Nortel built high-speed backbones and new networks that used the same protocols
  • 13. TCP/IP (Transmission Control Protocol/Internet Protocol
    • Accepted means of communication
    • Protocol
      • Is an agreed upon format for transmitting data between two or more devices
      • A set of formal rules for transmitting data
  • 14. TCIP/IP
    • Available for free
    • Rapid growth of the internet
    • Set up internet accounts with telecommunications companies and Internet service providers (ISPs)
    • Internet - most popular use
      • Email and file sharing