Today Internet suffers from resource bottlenecks and largely unpredictable user access patterns. TCP is widely used in the transport layer in wired network. However, in recent years, TCP is implemented in wireless link because of the high demand. This is because of the importance of supporting application over wireless communication. There are different implementations among which are TCP Reno, SACK and Vegas. The authors use simulations to evaluate these TCP congestion control algorithms in wireless networks.NS-2 is used for the simulation. Comparative study is done and delay is analyzed for different version of TCP.