Problem
I. Suppose Host A opens a TCP connection with Host B, and notifies Host B that the initial sequence number to expect will start from 120. Furthermore, suppose that Host A sends three TCP segments back-to-back to Host B over a TCP connection. The first segment is marked with sequence number 120, the second is marked with 160, and the third is marked with 200 and a fourth marked with 240. Given this:
i. How many BYTES of data did Host A send to Host B in the first segment?
ii. After Host B receives the second packet, it sends an ACK packet back to Host A. What is the acknowledgement number sent back to Host A?
iii. Suppose now that, instead of a successful receipt of packets by Host B that the first segment AND the second segment got lost. When Host B receives the third segment and the fourth segment, it replies with an ACK each time. What is the acknowledgement number sent back to Host A for each ACK? (Specify acknowledgment number for each ACK sent by Host B when the third and fourth segments are received).
iv. Let's go back and assume ALL segments arrived successfully. After the fourth packet is received by Host B, it replies with ACK(300). Then, Host A decides to close the TCP connection. Assuming all packets have successfully arrived and acknowledged, how many total bytes did Host A transfer to Host B?
II. A subnetwork has a network address of 207.61.32.252/30. Please answer the following questions:
i. How many unique IP addresses can be assigned behind this network?
ii. True/False: The host 207.61.32.257 is a possible and valid IP behind this subnetwork. (Justify your answer. Why or why not?...and be VERY specific)
iii. True/False: The host 207.61.32.254 is a possible and valid IP behind this subnetwork.
iv. What is the corresponding subnet mask (in dotted decimal notation) for the subnetwork address provided above?
v. List all the IP addresses that can be assigned behind this subnetwork. (At least ONE IP address on its own line, and in increasing numerical order).