August 2000
AN215 : ADVANCED NETWORKING

QUESTION 5

Total Marks: 15 Marks

• Question 1
• Question 2
• Question 3
• Question 4
• Cover Page

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SUGGESTED SOLUTIONS
for Question 5

Access control deals with the management of the communications medium. Control can either be centralized or distributed.

(a) What are the advantages and disadvantages of having centralized controls? [4]

(b) What does CSMA/CD stand for? What kind of media access control technique
does this type of network employ? Explain how this type of network operates. [4]

(c) What is the IEEE standard for CSMA/CD? Provide the standard frame format
for this standard. [5]

(d) Besides token-passing ring networks, what is the other type of network that uses the token passing scheme for media access? What is the IEEE standard for this type of network? [2]