Question

If two applications use TCP to send data but only send 10 bytes per segment (e.g. by using the push operation), what is the maximum percent of the network bandwidth they will have for their data?

Answer 1

TCP provides a reliable transport service between two processes running on different hosts. Another extremely important component of TCP is its congestion control mechanism. As we indicated in the previous section, TCP must use end-to-end congestion control rather than network-assisted congestion control, since the IP layer provides no feedback to the end systems regarding network congestion. Before diving into the details of TCP congestion control, let's first get a high-level view of TCP's congestion control mechanism, as well as the overall goal that TCP strives for when multiple TCP connections must share the bandwidth of a congested link.

IF TCP send 10 bytes per segment then max bandwidth is given as follows:

If a TCP sender transmits all w segments back-to-back, it must then wait for one round trip time (RTT) until it receives acknowledgments for these segments, at which point it can send w additional segments. If a connection transmits w segments of size MSS bytes every RTT seconds, then the connection's throughput, or transmission rate, is (w×MSS)/RTT bytes per second.

So, 10 bytes are sent but RTT is not given,so max bandwidth is 0.1 % as only 10 bytes per segment.

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