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TCP Sliding Window Acknowledgment System For Data Transport, Reliability and Flow Control (Page 2 of 9) The Problem With Unreliable Protocols: Lack of Feedback A simple send and forget protocol like IP is unreliable and includes no flow control for one main reason: it is an open loop system where the transmitter receives no feedback from the recipient. (I'm ignoring error reports using ICMP and the like for the purpose of this discussion.) A datagram is sent and it may or may not get there, but the transmitter will never have any way of knowing because no mechanism for feedback exists. This is shown conceptually in Figure 203.
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