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Andrew S. Tanenbaum Edition 5th Exercise 6 Question 27 (Page No. 608)

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In Fig. 6-36 we saw that in addition to the 32-bit acknowledgement field, there is an
ACK bit in the fourth word. Does this really add anything? Why or why not?

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in the fourth word the ACK bit means that its expecting required segment , of some specific size, from sender.
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