April 2000
AN215 : ADVANCED NETWORKING

QUESTION 1 (Compulsory)

Total Marks: 30 Marks

• Question 2
• Question 3
• Question 4
• Question 5
• Cover Page

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SUGGESTED SOLUTIONS
for Question 1

(a)Describe two reasons for using layered protocols.[4 marks ]

(b)Describe two advantages of using a ring topology for a network.[2 marks ]

(c)What is noise,in the context of data communications?Explain two ways in which noise may arise.[4 marks ]

(d)Name and briefly describe the 3 stages in circuit switching.[3 marks ]

(e)What are the components of the RS232-C standard?Briefly describe each one. [6 marks ]

(f)Of which layer of the OSI reference model is the RS232-C specification a part? [1 mark ]

(g)Briefly describe one encryption technique (include a suitable example).[3 marks ]

(h)Delay distortion is a type of network fault.Explain what this is.[2 marks ]

(i)Why is flow control necessary in data communications?[2 marks ]

(j)Message switching is prone to ’hacking ’.Why is this?Suggest possible solutions to combat this type of risk.[3 marks ]