Differentiate between a frame as used in IEEE 802.3 and a cell as used in ATM and explain why in a frame error checking occurs at the end of the frame while in cell it appears at the end of the header.

a. Describe the public key encryption data security technique. (4 Marks)
b. Describe the following standard interfaces used by data modems. (4 Marks)
i. V.24
ii. RS 449
c. Using the Open System Interconnection Reference Model, explain how data moves from a
computer to a hub, the bridge, another hub, router and finally the internet. (4 Marks)
d. You have been given the responsibility of recommending a suitable network to an organization
give basis for recommending X.25, frame Relay or ATM. (6 Marks)
e. Why is the ATM said to be the technology to implement ISDN. (2 Marks)







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