If ‘N’ TCP connections uses a bottleneck link with transmission rate R bps, then each TCP connection gets equal share(R/N) of available bandwidth(R).
That is, each TCP connection sends their files at the rate of R/N bps.
Always TCP aims at the fair share in the connection.
That is approximately half in the available transmission rate to each of the connections.
Here, two TCP connections are passing through a bottleneck link.
TCP shares R/2 bps transmission rate to each TCP connection.
Therefore, the transmission rate will be R/2.
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