December 1998
AN215: ADVANCED NETWORKING

QUESTION 1 (Compulsory)

Total Marks: 20 Marks

 Click here to access other questions

Click to access
SUGGESTED SOLUTIONS
for Question 1

 
(a) Explain briefly with the aid of diagram the following LAN topologies [6]
(i) Bus
(ii) Ring
(iii) Star

 
(b) Frequency division multiplexing (FDM) and time division multiplexing (TDM) are two channel allocation techniques. Briefly describe one of these, and one other channel allocation technique.

 

 [4]
(c) What are the two sub-layers that make up the data-link layer?

 

 [2]
(d) Briefly describe one encryption technique (include a suitable example).

 

 [3]
For parts (e) - (i), write down the letter of the appropriate answer in each case.
(e) At which layer of the OSI model do bridges operate?
  1. The Network Layer
  2. The Session Layer
  3. The Data-Link Layer
  4. The Physical Layer
  5. The Transport Layer

 

 [1]
(f) Which device would allow a LAN to access different devices on a WAN over a public network?
  1. Bridge
  2. Repeater
  3. Amplifier
  4. Router
  5. Fiber Optics

 

 [1]
(g) IEEE has defined  a standard for Token-bus networks. Which of the following defines this standard?
  1. 802.2
  2. 802.4
  3. 802.3
  4. 802.1
  5. 802.5

 

 [1]
(h) Which of the following access control methods is an example of contention technique?
  1. CSMA/CD
  2. CSMA/CA
  3. Token Ring
  4. Token Bus
  5. Polling

 

 [1]
(i) Which of the following types of transmission medium has the fastest data-rate?
  1. Copper Wire
  2. Unshielded Twisted Pair
  3. Shielded Twisted Pair
  4. Fibre Optic cable
  5. Microwave
 [1]