Transport Layer

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  TCP/IP layers 

  • recall the 5-layer model above
  • the network interface layer is often called the link layer
  • we use the generic term packet for each block of data transmitted
  • recall that each layer adds its own header, so nature of "packet" varies
  • so in fact the following terms are usually used for "packets" at each layer
    • frames at the link layer
    • datagrams at the internet layer
    • segments at the transport layer
  • we focus on the transport layer in this section

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