Think of the network connection diagrams that show lines at each level of
the IOS model connecting the hosts at each end. Layer 4 TCP at host A is
talking to layer 4 TCP at host B. If layer 3 IP messes up then it is up to
TCP to detect the error and notify the other end to retransmit.
Each layer h
Essentially IP is responsible for addressing the packet so that it conveys information
about the location of the destination and therefore can be routed.
TCP is responsible for establishing and maintaining reliable communications. This
means that if TCP A sends data to TCP B and this data is no
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