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In protocol rdt3.0 the ACK packets flowing from the receiver to the sender do not have sequence numbers although they do have an ACK field that contains the sequence number of the packet they are?
Wiki User
∙ 11y ago
To best answer this question consider why we needed sequence numbers in the first place. We
saw that the sender needs sequence numbers so that the receiver can tell if a data packet is a
duplicate of an already received data packet. In the case of ACKs, the sender does not need this
info (i.e. a sequence number on an ACK) to tell detect a duplicate ACK. A duplicate ACK is
obvious to the rdt3.0 receiver, since when it has received the original ACK it transitioned to the
next state. The duplicate ACK is not the ACK that the sender needs and hence is ignored by the
rdt3.0 sender.
Wiki User
∙ 11y ago
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