The OSI protocol stack includes Session and Presentation layers in addition to its Application…

(a) The OSI protocol stack includes Session and Presentation layers in addition to its Application layer. TCP/IP applications, such as Telnet and FTP, have no such separate layers defined. Do you think that such a separation should be made? Give some advantages and disadvantages of incorporating the OSI approach into TCP/IP. (4 marks)

(b) Show the calculations for finding the estimated percentages of overhead for TCP/IP protocol for IPv4 and IPv6 versions. (4 marks)

(c) Why is the length of a TCP segment limited to 65,536 bytes? (2 marks)

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