Nt1210-Unit 3 -Lab 3.1 Essay

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Zackery Skelton NT1210 Unit 3 Lab 3.1: Network Reference Models 1. Why would a three- layer model of communication that has the layers physical, network, and application be insufficient to adequately describe network communication? The three-layer model of communication would be insufficient to adequately describe network communication because because it would not have the ability to transport data to any other network. 2. What is the history of the OSI reference model? How did it come about and why was it created? Use your textbook and Internet research to support your answer. In the late 1970s, two projects began independently, with the same goal: to define a unifying standard for the architecture of networking systems. One was administered by the International Organization for Standardization (ISO), while the other was undertaken by the International Telegraph and Telephone Consultative Committee, or CCITT (the abbreviation is from the French version of the name). These two international standards bodies each developed a document that defined similar networking models. In 1983, these two documents were merged together to form a standard called The Basic Reference Model for Open Systems Interconnection. 3. What is the history of the TCP/ IP model? Why was it created? Use your textbook and Internet research to support your answer. TCP/IP originated out of the investigative research into networking protocols that the US Department of Defense (DoD) initiated in 1969. In 1968, the DoD Advanced Research Projects Agency (ARPA) began researching the network technology that is called packet switching. The original focus of this research was that the network be able to survive loss of subnet hardware, with existing conversations not being broken off. In other words, DoD wanted connections to remain intact as long as the source and destination nodes

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