Host A and B are directly connected with a 100 Mbps link. There is one TCP connection between the two hosts, and Host A is sending to Host B an enormous file over this connection. Host A can send its application data into its TCP socket at a rate as high as 120 Mbps but Host B can read out of its TCP receive buffer at a maximum rate of 50 Mbps. Describe the effect of TCP flow control.

Host A and B are directly connected with a 100 Mbps link. There is one TCP connection between the two hosts, and Host A is sending to Host B an enormous file over this connection. Host A can send its application data into its TCP socket at a rate as high as 120 Mbps but Host B can read out of its TCP receive buffer at a maximum rate of 50 Mbps. Describe the effect of TCP flow control.

A+ Guide To It Technical Support

10th Edition

ISBN:9780357108291

Author:ANDREWS, Jean.

Publisher:ANDREWS, Jean.

Chapter8: Network Infrastructure And Troubleshooting

Section: Chapter Questions

Problem 8TC

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Host A and B are linked directly to a 100 Mbps link. There is a TCP link between the two servers, and the host A sends a huge file to host B. Host A can transmit its application data to its TCP socket at a rate of 120 Mbps, but Host B can read its TCP buffer at a maximum speed of 50 Mbps. Describe the TCP flow control effect.
Host A and B are communicating over a TCP connection, and Host B has already received from A all bytes up through byte 126. Suppose Host A then sends two segments to Host B backto-back. The first and second segments contain 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 port number is 80. Host B sends an acknowledgment whenever it receives a segment from Host A.a. In the second segment sent from Host A to B, what are the sequence number, source port number, and destination port number?b. If the first segment arrives before the second segment, in the acknowledgment of the first arriving segment, what is the acknowledgment number, the source port number, and the destination port number?c. If the second segment arrives before the first segment, in the acknowledgment of the first arriving segment, what is the acknowledgment number?d. Suppose the two segments sent by A arrive in order at B. The…
Host A is sending an enormous file to Host B over a TCP connection. Over this connection there is never any packet loss and the timers never expire. Denote the transmission rate of the link connecting Host A to the Internet by R bps. Suppose that the process in Host A is capable of sending data into its TCP socket at a rate S bps, where S=10·R. Further suppose that the TCP receive buffer is large enough to hold the entire file, and the send buffer can hold only one percent of the file. What would prevent the process in Host A from continuously passing data to its TCP socket at rate S bps? TCP flow control? TCP congestion control? Or something else? Elaborate.
Host A and B are communicating over a TCP connection. Host B has already received from Host A all bytes up through byte 23. Suppose Host A then sends two segments to Host B back-to-back. The first and the second segments contain 30 and 50 bytes of data, respectively. In the first segment, the sequence number is 24, the source port number is 3000, and the destination port number is 80. Host B sends an acknowledgment whenever it receives a segment from Host A. A. In the second segment sent from Host A to B, what arethe sequence number_________,source port number __________,and destination port number__________?B. If the second segment arrives after the first segment, in the acknowledgment of the second segment, what arethe acknowledgment number___________,the source port number__________,and the destination port number __________?C. If the second segment arrives before the first segment, in the acknowledgment of the first arriving segment,what is the acknowledgment number ___________?D.…
Host A and B are communicating over a TCP connection, and Host B has already received from A all bytes up through byte 126. Suppose Host A then sends two segments to Host B backto-back. The first and second segments contain 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 port number is 80. Host B sends an acknowledgment whenever it receives a segment from Host A. d. Suppose the two segments sent by A arrive in order at B. The first acknowledgment is lost and the second acknowledgment arrives after the first timeout interval. Draw a timing diagram, showing these segments and all other segments and acknowledgments sent. (Assume there is no additional packet loss.) For each segment in your figure, provide the sequence number and the number of bytes of data; for each acknowledgment that you add, provide the acknowledgment number.
A Wireshark trace of TCP traffic between hosts A and B indicated the following segments. A sent a segment of 0 bytes data payload to B with FIN flag set, sequence number 1000 and ACK number 500. Later B sent a segment of 0 bytes data with FIN flag set, sequence number 500 and ACK number 1001. What is the state of the connection in host B after receiving FIN from A______________________ and after sending its FIN to A __________________________?
Consider the Host Aand Host B TCP link. Assume that the TCP segments that fly from host Ato host B have source port x and destination port y. What are the source and destination port numbers of Host B to Host A segments?
QUESTION 19 Suppose a process in Host C has a UDP socket with port number 4320. Suppose both Host A and Host B each send a UDP segment to Host C with destination port number 4320. Then both of these segments will be directed to the same socket with port number 4320 at Host C True False QUESTION 20 With TCP’s flow control mechanism, where the receiver tells the sender how much free buffer space it has (and the sender always limits the amount of outstanding, unACKed, in-flight data to less than this amount), it is not possible for the sender to send more data than the receiver has room to buffer. True False
Suppose two hosts are connected with each other by means of a 100-Mbps link, and assume the round-trip time between them is 1 ms. What is the minimum TCP window size that would let TCP achieve the maximum possible throughput between these two hosts? (Note: Assume no overhead.)
Consider transferring an enormous file of L bytes from host A to host B. Assume an MSS of 1460 bytes.a. What is the maximum value of L such that TCP sequence numbers are not exhausted? Recall that the TCP sequence number field has four bytes.b. For the L you obtain in (a), find how long it takes to transmit the file Assume that a total of 66 bytes of transport, network, and data-link header are added to each segment before the resulting packet is sent out over at 10 Mbps link. Ignore flow control and congestion control so A can pump out the segments back to back and continuously.
Consider transferring an enormous file of L bytes from Host A to Host B. Assume an MSS of 536 bytes.a. What is the maximum value of L such that TCP sequence numbers are not 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 66 bytes of transport, network, and data-link header are added to each segment before the resulting packet is sent out over a 155 Mbps link. Ignore flow control and congestion control so A can pump out the segments back to back and continuously.
a) Host A uses TCP to transfer a file to host B. The file contains 24 MSS (maximum segment size) worth of data. During the transmission Round 1 (that corresponds to one RTT), the congestion window is 1 MSS. During Round 4 when the connection is still in slow start, all the transmitted packets are lost. Assume that host A times out at the start of round 8 (i.e. it is idle in rounds 5 to 7). What is the Slow Start threshold at this point? Show detailed analysis. b) Assuming that there is no packet loss during any other round. During what data transmission Round does B receive the complete file? Ignore connection establishment and termination and assume that the RTT is large enough that transmission time is negligible. Show your detailed work