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TCP is a sliding window protocol that provides handling for both timeouts and retransmissions TCP performs unsatisfactorily since packet reordering and random losses may be falsely interpreted as congestive losses. This TCP triggers fast retransmission and fast recovery, leading to under-utilization of available network resources. The transmitted data does not have security .There is a lot of possible attack in original information. Data modification also possible by the user .There is no data confidentiality during data transmission. In this paper, the authors propose a novel TCP variant, known as TCP for Non Congestive Loss (TCPNCL),to adapt TCP to wireless networks by using more reliable signals of packet loss and network overload for activating packet retransmission and congestion response, separately.
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