Compare networking conceptual models.

Comparison should include the following models:

• Open systems interconnect (OSI)–a seven-layer model that describes communication between systems; the seven layers include the following:
  • Application
  • Presentation
  • Session
  • Transport
  • Network
  • Data link
  • Physical
• Internet transmission control protocol/Internet protocol (TCP/IP)–a four-layer model that describes communication between systems; the four layers include the following:
  • Application
  • Transport (transport/TCP)
  • Network (Internet/IP)
  • Network Access (link, physical)

Process/Skill Questions:

• What layers of the OSI model are important to the app developer?
• What is the benefit of a layered model for representing network communication systems?
• What does TCP provide that IP does not?
• What is an example of software at the application layer of the TCP/IP model?