Bit2108:Computer Networks Question Paper
Bit2108:Computer Networks
Course:Bachelor Of Information Technology
Institution: Meru University Of Science And Technology question papers
Exam Year:2012
1
INSTRUCTIONS: Answer question one and any other two questions
QUESTION ONE – 30 MARKS
a. Describe the term ‘baseband’ and ‘broadband’. (4 Marks)
b. Explain the following terms as used in computer networks. (8 Marks) i. Bandwidth ii. Hosts iii. Intranet iv. Extranet
c. Differentiate between ‘circuit switching’ and ‘packet switching’. (4 Marks) d. With the aid of a suitable diagram show the construction of a typical fiber optic cable. (4 Marks)
e. Repeaters and gateways are used for networking. Under what circumstances would each of these technologies be used? (4 Marks)
f. Describe asynchronous and synchronous modes of data transmission. (4 Marks) g. What is the function of a terminator in a networked environment? (2 Marks)
QUESTION TWO – 20 MARKS
a. Distinguish between LAN and WAN giving an example of each. (4 Marks) b. Explain the operation of the carrier sense multiple access with collision detection (CSMA/CD) contention technique used in Ethernet. (6 Marks) c. Describe the token passing process in the token ring topology. (6 Marks) d. List two benefits of thin client computing. (4 Marks)
2
QUESTION THREE – 20 MARKS
a. Explain the difference between client/server based networks and peer-to-peer networks. (4 Marks) b. Describe the OSI model seven layers, explaining the function of each layer. Give examples of protocols in each layer. (10 Marks) c. Explain with the aid of suitable diagrams the terms: (6 Marks) i. Amplitude modulation ii. Frequency modulation iii. Phase modulation
QUESTION FOUR – 20 MARKS
a. Using labelled diagrams, describe three LAN topologies stating the strength and weaknesses of each. (6 Marks) b. Modern networks including the internet use packet switching technique to transport message from sender to receiver. Briefly explain the concept of packet switching. (6 Marks) c. Both TCP and UDP offer transport services. Explain their differences stating where each is best suited. (6 Marks) d. Provide a brief description of the decapsulation process in networking. (2 Marks)
QUESTION FIVE – 20 MARKS
a. Briefly discuss the security risks of a computer network and state how you can mitigate against these risks. (8 Marks) b. Describe two key components of a wireless LAN. (4 Marks) c. In terms of the security of data, describe how a wireless LAN differs from a conventional wired LAN. (6 Marks) d. List any two default groups in a Windows Server. (2 Marks)
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