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UDP Client and Server Programs

This assignment, you will write UDP client and server echo programs. You will also learn the advantages and disadvantages of UDP over TCP and understand how UDP can be used for bidirectional communication in spite of its lack of connection.

 

Using the online library or the Internet, research UDP client and server echo programs and UDP broadcasting

 

Based on your research and understanding, complete the following discussions:

 

Part 1

 

Answer the following questions:

 

  • How can you enhance a UDP application to provide the kind of reliability offered by TCP?
  • What are the situations when UDP is preferred over TCP, and vice versa?

 

Part 2

 

Write and post client and server programs to implement a reliable File Transfer Protocol (FTP) using UDP. Your program should take the following into consideration:

 

  • The client will request chunks of a file from the server. If the client does not receive some chunks back after a certain period of time, the client will ask for those chunks again.
  • The client can request multiple chunks of data in one request and can handle multiple replies from the server.
  • The client should be able to handle overlapping chunks of data, find missing chunks, and only request missing data, not the entire window worth of data, to be retransmitted.
  • The client will send a request message to the server and then wait for data messages in reply. If the client does not receive a valid response before a time-out occurs, it will retransmit the request. If, however, the client receives some valid replies, it will transmit a request for missing data in each gap before requesting for new data. A retransmission request is made in each gap before requesting for the new data. Retransmission is done for a maximum of four times. A selective retransmission request is considered a separate request.
  • The server will listen at a given port for client requests. If it receives a well-formed request, the server will respond with the data message. However, if the server encounters an error, it will send an error message.

** Write the code for this discussion or find the code on the Internet to make this process possible **

 

                              

 

     Grading Criteria for this assignment

 

* Quality of Initial Posting

 

* Writing of Mechanics ( Spelling, Grammar, APA formating, Use of Abstracts, and Literacy are a must)

 

 

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