December 1998
NI222: NETWORKS AND THE INTERNET

QUESTION 2

Total Marks: 20 Marks

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SUGGESTED SOLUTIONS
for Question 2

 
(a) Explain two advantages and two disadvantages of using a layered architecture in organising network protocols.

 

 [4]
(b) List the protocol stack for a Web application and an Email application, assuming an ethernet network.

 

 [2]
(c) With the aid of a suitable diagram, describe the three IP Address formats used for addressing single hosts. From these, identify which is the most commonly encountered. Also explain briefly the IP address format used for multiple destinations.

 

 [8]
(d) Describe the main properties of routers used in wide area networks, and explain briefly the concept of hierarchical routing used in the Internet. [6]