24. TCP provides the following services a. reliable data transfer b. flow control c. congestion control all the above 25. Retransmissions are triggered in TCP by: a. timeout events b. duplicate acknowledgments c. both a and b d none of the above
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- 1. Suppose a TCP connection is transferring a file of 5550 bytes. The first byte is numbered 10001. What are the sequence numbers for each segment if each carries 500 bytes? How many Segments will be there ?5. What can you say about the TCP segment in which the value of the control field isone of the following? a) 000000 b) 000001 c) 010001 Solving with explanationQ3) A. Suppose TCP operates over a 1-Gbps link. Assuming TCP could utilize the full bandwidth continuously, how long would it take the sequence numbers to wrap around completely? B. fill in the blanks 1. The packets exchanged between TCP peers are called 2. In TCP Header The Acknowledgment, SequenceNum, and AdvertisedWindow fields are all involved in TCP's 3. In TCP Header The SYN flag is used when 4. Required window size for 100-ms RTT and bandwidth 1.5Mbps is ---- 5. In Karn/ Partridge algorithm If the variance among Sample RTTS is small Then the Estimated There is no need to 6. АТM (-- ---> 7. Instead of using coax cable, an Ethernet can be constructed from a thinner cable known as 10Base2, thus 10 means Base means 2 means that a
- 3. TCP's Flow Control guarantees that. Optional Answers: 1. The sender won't overwhelm the receiver 2. The congestion window (cgwin) will be larger than the receiver's window (rwnd) 3. the amount of data transmitted by the sender is always larger than rwnd 4. No packets will be dropped. TCP is reliable. 4. TCP uses a 3-way handshake to setup a connection before transmitting actual data. Optional Answers: 1. True 2. FalseIs this the right answer or the wrong answer? Assume that the most recent SampleRTT for a TCP connection is one second. The TimeoutInterval setting for the connection must now be set to a value that is greater than one second.Write a Java code that contains: -develop a TCP secure socket and successfully transmit packetsbetween two computers (server & client)-Authentication & Confidentiality service is Apply in this code
- a) Complete the missing sequence numbers (SEQ), acknowledgment numbers (ACK), and segment length (LEN) in the following TCP connection. We assume: • No timeouts occur at the receiver. • The sender starts the timer at tl. • The connection is full duplex (bi-directional data flow in same connection). • The sender and the receiver have always data to transmit. • There are no delayed acknowledgements at the sender or the receiver. Sender Receiver t1 SEO:190 ACKA LEN40 12 SEO B ACK20LEN C A B SEO F ACK=G LEN SEO:160 ACK25LEN= SEQD ACKE LEN E: F: G: J SEQ HACKLLEN= t4 SEO=140 ACKSLEN=20 b) Calculate the vahue of timeout for the segment with sequence number 140.Q1.Suppose a client, say C, has established a TCP connection with a server, say S. After establishing the connection, the sender sends two TCP messages with data back-to-back ( the first TCP message with sequence number 32 and the second TCP message with sequence number 100). a. What is the sequence number chosen by the client? What could be the reason for choosing this value of sequence number?b. What is the data size of first and second TCP data messages?c. Suppose the server receives the first and second TCP messages with data with the difference of 100 milliseconds delay. What could be the ACK number for both the TCP data messages from the server side as per the TCP RFC.Could i please have some assistance with the following questions. a) When using the exponential weighted moving average (EWMA) to calculate the running time of the RTT, what does the constant ‘x’ control? b) Consider a TCP segment. What is sequence number? What is the range of the sequence number? What is the acknowledge number (ACK)?
- P27. 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 back-to-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. In the second segment sent from Host A to B, what are the sequence number, source port number, and destination port number? 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? If the second segment arrives before the first segment, in the acknowledgment of the first arriving segment, what is the acknowledgment number? Suppose the two segments sent by A arrive in order at B.…Assume a TCP sender sends four packets of size 1024 bytes, carrying bytes 0-4095. If the second packet is lost, what is the content of the Acknowledgement field sent in response to the third packet? (If you think that no acknowledgement is sent, for example because the third packet is out of order, then answer -1.)TCP is a sliding window protocol. This means. а. there can be more than one segment "in flight" (sent but no ACK has been received) at a time. O b. the TCP retransmission timer slides up as ACKS are received. O c. there can only be one segment outstanding (sent but no ACK has been received) at at time.
