Computer Networks. Problem 24 in the following image.

PROBLEM 23. Consider the GBN and SR protocols. Suppose the sequence number space is of size k. What is the largest allowable sender window that will avoid the occurrence of problems such as that in Figure 3.27 for each of these protocols? P24, when both the client and server are prepared to communicate, i.e., that the server is listening on the port to which the client sends its SYN segment, a TCP connection can be easily established. Now, consider what happens when a host receives a TCP segment whose port numbers or source IP address do not match with any of the ongoing sockets in the host. For example, suppose a host receives a TCP SYN packet with destination port 80, but the host is not accepting connections on port 80 (that is, it is not running a Web server or port 80). What will happen in this case? 2. Consider the same situation as described in Problem P24. However, the pro- tocol is UDP, instead of TCP. Describe what will happen. Assume an MSS of 512 bytes a. What is the maximum value of L such that TCP sequence numbers are not P25 Consider transferring an enormous file of L bytes from Host A to Host B exhausted? Recall that the TCP sequence number field has 4 bytes. b. For the L you obtain in (a), find how long it takes to transmit the file. Assume that a total of 64 bytes of transport, network, and data-link header are added to each segment before the resulting packet is sent out over a 156 Mbps link. Ignore flow control and congestion control so A can pump out the segments back to back and continuously A and B are communicating over a TCP connection, and Host B has received from A all bytes up through byte 126. Suppose Host A then sends contain two segments to Host B back-to-back. The first and second segments n 80 and 40 bytes of data, respectively. In the first segment, the sequence number is 127, the source port number is 302, and the destination lumber is 80. Host B sends an acknowledgment whenever it receives a second segment sent from Host A to B, what are the sequence nurm segment arrives before the second segment, in the acknowledg egment from Host A ber, source port number, and destination port number? b. Ii the first ment of the the first arriving segment, what is the acknowledgment number source port number, and the destination port number