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R 1 0 . What is meant by a handshaking protocol? R 1 1 . Why do HTTP , SMTP , and IMAP run on

R10. What is meant by a handshaking protocol?
R11. Why do HTTP, SMTP, and IMAP run on top of TCP rather than on UDP?
R12. 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.
R13. Describe how Web caching can reduce the delay in receiving a requested object. Will Web caching reduce the delay for all objects requested by a user or for only some of the objects? Why?

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