The TCP/IP Protocol Suite
     Need
     Published standards so that 
      manufacturers can supply equipment 
      and software that could function well 
      with products of other vendors. 
     Open System Interconnection (OSI) 
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        The TCP/IP Protocol Suite
     OSI Reference Model
    By International Organization for 
     Standardization. 
    Seven level hierarchy as compared to four 
     level hierarchy we just learnt
    Remained slow in replacing the 4 level 
     hierarchy as it was already in use. 
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        The TCP/IP Protocol Suite
     TCP and IP
     TCP Suite is collection of large number 
      of protocols to implement four level 
      hierarchy 
     Entire collection is referred to as 
      TCP/IP-misleading.
     Transmission Control Protocol
     Internet Protocol
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        The TCP/IP Protocol Suite
      TCP version
     TCP defines a version of transport layer. 
     More than one way of implementing 
      transport layer either for TCP or UDP 
      (User Datagram protocol)
     This is similar to choosing different 
      shipping company
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        The TCP/IP Protocol Suite
     Differences between TCP and UDP
     TCP establishes a connection first while 
      UDP does not. 
     UDP is called connectionless protocol
     Destination might not be operational!
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