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Computer Networks

by: Miss Alden Shanahan

Computer Networks CS 4263

Miss Alden Shanahan

GPA 3.9

Abdullah Faruque

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Abdullah Faruque
Class Notes
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This 3 page Class Notes was uploaded by Miss Alden Shanahan on Tuesday October 20, 2015. The Class Notes belongs to CS 4263 at Southern Polytechnic State University taught by Abdullah Faruque in Fall. Since its upload, it has received 16 views. For similar materials see /class/225456/cs-4263-southern-polytechnic-state-university in ComputerScienence at Southern Polytechnic State University.

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Date Created: 10/20/15
Chapter 3 Review Questions 1 N E 4 a Call this protocol Simple Transport Protocol STP At the sender side STP accepts from the sending process a chunk of data not exceeding 1196 bytes a destination host address and a destination port number STP adds a fourbyte header to each chunk and puts the port number of the destination process in this header STP then gives the destination host address and the resulting segment to the network layer The network layer delivers the segment to STP at the destination host STP then examines the port number in the segment extracts the data from the segment and passes the data to the process identi ed by the port number b The segment now has two header elds a source port eld and destination port eld At the sender side STP accepts a chunk of data not exceeding 1192 bytes a destination host address a source port number and a destination port number STP creates a segment which contains the application data source port number and destination port number It then gives the segment and the destination host address to the network layer After receiving the segment STP at the receiving host gives the application process the application data and the source port number c No the transport layer does not have to do anything in the core the transport layer lives in the end systems a For sending a letter the family member is required to give the delegate the letter itself the address of the destination house and the name of the recipient The delegate clearly writes the recipient s name on the top of the letter The delegate then puts the letter in an envelope and writes the address of the destination house on the envelope The delegate then gives the letter to the planet s mail service At the receiving side the delegate receives the letter from the mail service takes the letter out of the envelope and takes note of the recipient name written at the top of the letter The delegate than gives the letter to the family member with this name b No the mail service does not have to open the envelope it only examines the address on the envelope Source port number y and destination port number x An application developer may not want its application to use TCP s congestion control which can throttle the application s sending rate at times of congestion Often designers of IP telephony and IP videoconference applications choose to run their applications over UDP because they want to avoid TCP s congestion control Also some applications do not need the reliable data transfer provided by TOP V39 0 gt1 9 0 a false b false Since most firewalls are con gured to block UDP traffic using TCP for video and voice traffic lets the traff1c though the firewalls Yes The application developer can put reliable data transfer into the application layer protocol This would require a significant amount of work and debugging however Yes both segments will be directed to the same socket For each received segment at the socket interface the operating system will provide the process with the IP addresses to determine the origins of the individual segments For each persistent connection the Web server creates a separate connection socket Each connection socket is identified with a fourtuple source IP address source port number destination IP address destination port number When host C receives and IP datagram it examines these four fields in the datagramsegment to determine to which socket it should pass the payload of the TCP segment Thus the requests from A and B pass through different sockets The identifier for both of these sockets has 80 for the destination port however the identifiers for these sockets have different values for source IP addresses Unlike UDP when the transport layer passes a TCP segment s payload to the application process it does not specify the source IP address as this implicitly specified by the socket identifier Sequence numbers are required for a receiver to find out whether an arriving packet contains new data or is a retransmission To handle losses in the channel If the ACK for a transmitted packet is not received within the duration of the timer for the packet the packet or its ACK or NACK is assumed to have been lost Hence the packet is retransmitted A timer would still be necessary in the protocol rdt 30 If the round trip time is known then the only advantage will be that the sender knows for sure that either the packet or the ACK or NACK for the packet has been lost as compared to the real scenario where the ACK or NACK might still be on the way to the sender after the timer expires However to detect the loss for each packet a timer of constant duration will still be necessary at the sender Java Applet Java Applet c true d false e true f false g false a 20 bytes b ack number 90 16 3 segments First segment seq 43 ack 80 Second segment seq 80 ack 44 Third segment seq 44 ack 81 17 W2 18 False it is set to half of the current value of the congestion window


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