COMP3331/9331 - Computer Networks and Applications

Assignment Task

Goal

You are to implement a reliable transport protocol over the UDP protocol. We will refer to the reliable transport protocol that you will be implementing in this assignment as Simple Transport Protocol. STP will include most (but not all) of the features that are described in Sections of the text Computer networking by Kurose and Ross or equivalent parts from the week lecture notes. Examples of these features include timeout, sequence numbers, sliding window, etc. Note that these features are commonly found in many transport protocols. Therefore, this assignment will give you an opportunity to implement some of these basic features of a transport protocol. In addition, you may have wondered why the designer of the TCP/IP protocol stack includes such a feature-less transport protocol as UDP. You will find in this assignment that you can design your own transport protocol and run it over UDP. This is the case for some multimedia delivery services on the Internet, where they have implemented their own proprietary transport protocol over UDP QUIC a newly proposed transport protocol also runs over UDP and implements additional functionalities such as reliability. Recall that UDP provides point-to-point, unreliable datagram service between a pair of hosts. 

Assignment 

Should be implemented as two separate programs Sender and Receiver. You should implement unidirectional transfer of data from the sender to the receiver. As illustrated in Figure data segments will flow from Sender to Receiver while ACK segments will flow from receiver to sender. The sender and receiver programs will be run from different terminals on the same machine, as the IP address for the sender and receiver in your program. Let us reiterate this, STP must be implemented on top of UDP. Do not use TCP sockets. If you use TCP, you will not receive any marks for your assignment.

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