JCOM_V2_N3_RP3 Sreekanth Bandi Balakoteswara Panchakshari Shoba Bindu C. Journal on Computer Science 2347–6141 2 3 11 16 Congestion Control, Constant Bit Rate (CBR), TCP New Reno, TCP Reno, TCP Tahoe, TCP Vegas Transmission Control Protocol (TCP) is the transport layer protocol which is reliable and connection oriented. The beauty of TCP is its congestion control feature. TCP delights the packet losses as an indication of the congestion. TCP is widely used on the internet. There are various congestion control mechanisms that are available based on four basic approaches, such as slow-start, congestion avoidance, fast retransmit and fast recovery. Several TCP variants are used to control and avoid the congestion; these are TCP Tahoe, TCP Reno, TCP Vegas, and TCP New Reno. In this paper, the authors have evaluated the performance of various TCP congestion control algorithms with different Constant Bit Rate (CBR) traffic from the following aspects, based on the number of packets sent, number of packets lost and number of packets dropped. To calculate Packet Delivery Ratio (PDR), average end-end delay and average packet loss are calculated. In order to evaluate the performance of various TCP variants, the authors have used NS-2 simulator and the graphs have been generated using Xgraph. September - November 2014 Copyright © 2014 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=3312