Hosts A and B are communicating over a TCP connection, and Host B has already received from

A all bytes up through byte $500.$ Suppose Host A then sends three segments to Host B back$-$to$-$

back. The first, second and third segments contain $100,70,$ and $80$ bytes of data respectively. In

the first segment, the sequence number is $500,$ the source port number is $1000,$ and the

destination port number is $2000.$ Host B sends an acknowledgment whenever it receives a

segment from Host AHosts A and B are communicating over a TCP connection, and Host B has already received from

A all bytes up through byte $500.$ Suppose Host A then sends three segments to Host B back$-$to$-$

back. The first, second and third segments contain $100,70,$ and $80$ bytes of data respectively. In

the first segment, the sequence number is $500,$ the source port number is $1000,$ and the

destination port number is $2000.$ Host B sends an acknowledgment whenever it receives a

segment from Host A