Answer should be original and similarity (plagiarism) not more than 10% this is very important. Answer should be clear explanation. Answer should be references on Harvard style (Not use Wikipedia) should be Academic Articles or books. When use citation from any reference please keep it between "citation" (Author,Year). As reference you can use the following book: Jim Kurose & Keith Ross (2010), COMPUTER NETWORKING: A Top-Down Approach. 5th ed. Boston: Addison Wesley. Assignment is: 1. List and discuss the four broad classes of services that a transport protocol can provide. For each of the service classes, indicate if either UDP or TCP (or both) provides such a service. 2. Consider an e-commerce site that wants to keep a purchase record for each of its customers. Describe how this can be done with cookies. 3. For the client-server application over TCP described in section 2.7 of the textbook, why must the server program be executed before the client program? For the client-server application in section 2.7 of the textbook, why may the client program be executed before the server program. (Please check section 2.7 from the book, if you dont have the book I will send scan copy to you)

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