Question

Assignment 4 - Problem Set Homework . Due in 15 hours 3/21 answered Close Question 2: Hosts A and B are communicating over a TCP connection, and Host B has already received from A all bytes up to and including byte 1059. Suppose Host A then sends three segments to Host B back-to- back. The first second and third segments contain 1200, 150 and 80 bytes of data respectively. In the first segment, the sequence number is 1060, the source port number is 8080, and the destination port number is 80. Host B sends an acknowledgment whenever it receives a segment from Host A. Answer the following questions: Question 2 -part (a) Homework. Unanswered What is the sequence number in the second segment sent by Host A? Numeric Answer: Unanswered Submit Question 2 -part (b) Homework. Unanswered What is the sequence number in the header of the third segment sent by Host A Numeric Answer

Answer 1

Given, the following data:

• Host A and B are communicating over a TCP connection, and Host B has already received from A all bytes up through byte 1059.
• The first, second and third segments contain 1200, 150 and 80 bytes of data, respectively.
• The first segment of sequence number is 1060.
• The source port number is 8080.
• The destination port number is 80.

a. Sequence number in the second segment is:

=> Sequence number of first segment + Destination port number

=> 1060 + 80

=> 1140

Sequence number = 1140

Source port number = 8080

Destination port number = 80

b. Sequence number in the third segment is:

=> Sequence number of second segment + Destination port number

=> 1140 + 80

=> 1220

Sequence number = 1220

Source port number = 8080

Destination port number = 80

c. Destination port number = 80

• Because, it is sending third segment but still sending to host B only.

d. Acknowledgement number = Sequence number while sending = 1140

Source port number = 80

Destination port number = 8080

e. Acknowledgement number = 1060

• Because, it is still waiting for the first segment.