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We know that bandwidth delay product for one way communication i.e half duplex is (one way propagation delay)*(bandwidth).This gives the maximum number of bits that can be present in the link before receiver receives the first bit.

when there is two-way communication i.e full-duplex then bandwidth delay product is (RTT)*(bandwidth).This gives the maximum number of bits that can be present in the link before sender receives the first acknowledgement from receiver.

Now my question is in case of full-duplex when the receiver received the first bit then the pipe was (one way propagation delay)(bandwidth) full. Now when the receiver sends the acknowledgement (till it reaches sender) it becomes more (one way propagation delay)(bandwidth) full, then while sender was filling the pipe while receiver was sending the acknowledgment,won't the acknowledgement and the sender data COLLIDE? or else how this mechanism takes place?I can't visualize it...

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