The internet plays a significant role nowadays in the people lives. Two main protocols are being implemented in the transport layer of the internet, namely UDP (User Datagram Protocol) and TCP (Transmission Control Protocol). They are distinguished by their connection type. UDP is a connectionless protocol that suits for multimedia transmissions. TCP is a connection - oriented protocol used to provide a reliable data transfer between two systems. Internet traffic is TCP-based, which causes congestion. To avoid the congestion existing method used slow start, congestion avoidance, and fast retransmit.