Communication to and from the channel emulator uses UDP. To implement the protocols, you need to write two programs: a sender and a receiver with the specifications given below. For simplicity, the protocol only needs to be unidirectional, i.e., data flows in one direction (from sender to receiver) and acknowledgements (ACKs) in the opposite direction. The reliable transfer protocol must be able to handle network errors such as packet loss, duplication, and reordering. You must implement both the Go-Back-N and Selective Repeat versions of pipelined reliable data transfer, as well as a simple file transfer application that can transfer any file (including binary files) over the unreliable channel emulator. In this assignment, you are provided with an unreliable channel emulator.
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