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Abstract — Transport Control Protocol (TCP) incast congestion happens when number of senders work in parallel with the same server where the high bandwidth and low latency network problem occurs. TCP provides an end-to-end, reliable, byte-oriented service to the applications. To prevent senders from overwhelming the receivers, TCP employs flow control whereas in order to avoid overwhelming the network, it uses congestion control. Packet loss is the main reason of congestion and incast congestion degrades the performance of system. Congestion also occur in Broadcast condition and it also degrades the performance of network. To improve the performance and to provide security this paper focuses on the TCP throughput, RTT, receive window, retransmission and RC6 for security. Index Terms — Data-center networks, incast congestion, TCP, retransmission