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present age is the age of science and it is not wrong to that almost everybody depend upon science for almost everything. The wide use of wireless network and the various hand held devices increase their importance which results in the popularity of ad hoc network. MANET consists of various mobile nodes that communicate with each other. The reason for congestion in a mobile ad hoc network is not only congestion loss can take place due to various reasons which are BER, multipath routing, other attacks and so on. In this paper the study of various TCP variants has been done which are compared and analyzed on the basis of end to end delay parameter.. The routing protocols which have been taken are AODV, DSR and DSDV and the variants are TCP, TCP SACK,TCP New Reno, TCP Vegas and TCP Westwood. This comparison is done with the help of simulation in NS-2 and the analysis is done on the basis of end to end delay parameter which shows which variant perform better in respective routing protocols and less delay the variant takes the number of packets reaches its destination which means more data reaches the destination. This analysis also helps in better speed, reliability and congestion control KeywordsDSR, DSDV, TCP, TCP Variants, MANET.

End to End Delay Performance and Comparative analysis of Various TCP Variants in Mobile Ad hoc Networks (MANETs)