During the establishment of the TCP connection as shown in the figure , the Z part of SYN should be filled in ________ .

 During the establishment of the TCP connection as shown in the figure , the Z part of SYN should be filled in ________ .

A . a
B . b
C . a+1
D . b+1

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Answer:   D

Explanation:

X = a + 1 (confirm receipt of a , expect to send a + 1 next time )

Y = a + 1

Z = b + 1 (Confirm receipt b )