Name the various layers of the osi model, Computer Network Security

Problem

(a) Name the various layers of the OSI model.

(b) Show, by means of a diagram, how the TCP/IP reference model is different from the OSI-7 reference model? Why is the TCP/IP model widely used?

(i) What is the function of a Mail Access Protocol?

(ii) Describe briefly the two download modes of POP3.

(iii) From an ISP's point of view, POP3 and IMAP differ in an important way. Imagine that you were called in to advise an ISP on which protocol it should support. What considerations would you bring up?

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