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Bbt 2102:Fundamentals Of Computer System Question Paper
Bbt 2102:Fundamentals Of Computer System
Course:Bachelor Of Business Information Technology
Institution: Meru University Of Science And Technology question papers
Exam Year:2014
1
INSTRUCTIONS: Answer question one and any other two questions
QUESTION ONE – 30 MARKS
a. Explain each of the following terms as used in computer networks. (4 Marks)
i. Protocol
ii. Asynchronous transmission
b. Using the data stream 010011, draw the graphs for the following line codes: (4 Marks)
i. Return to zero
ii. Non return to zero inverted
c. By use of a diagram, describe the basic communication model on which computer networks are
based. (6 Marks)
d. A computer network is created when two or more computers are wired together to share
information and resources. Discuss four other motivations for computer networks. (4 Marks)
e. Describe four functions of the TCP/IP protocol. (4 Marks)
f. Specify which layer of the OSI model provides the following functions. (2 Marks)
i. Physical connections
ii. Common language
g. Given the IP address and subnet mask 132.34.40.19 and 255.255.255.240
i. What are the net id, subnet id and host id. (4 Marks)
ii. What is the maximum number of subnets in this network? (1 Mark)
iii. What is the maximum number of hosts per subnet in this network? (1 Mark)
QUESTION TWO – 20 MARKS
a. State two error detection and control mechanisms. (2 Marks)
b. Explain four salient features of the IEEE 802 for LAN. (4 Marks)
c. Signal picks unwanted random energy during transmission, discuss four such transmission
impairments. (4 Marks)
d. With the aid of a neat diagram explain the transmission control protocol/internet protocol
(TCP/IP) suite. (10 Marks)
2
QUESTION THREE – 20 MARKS
a. Distinguish between the following networking hardware’s (4 Marks)
i. Switch and router
ii. Repeater and bridge
b. Explain each of the following error correction mechanism. (6 Marks)
i. Hamming distance
ii. Block interleaving
c. Describe the following data switching technologies specifying one ideal application area of each.
(4 Marks)
i. Packet switched networks
ii. Circuit switched networks
d. Satellite communication is a technology implemented in the creation of data networks; describe
the characteristics of the media clearly showing the satellite transmission process. (6 Marks)
QUESTION FOUR – 20 MARKS
a. Distinguish between guided and unguided transmission media giving an example in each case.
(4 Marks)
b. Describe the pulse code modulation (PCM) technique used in converting analogue data into a
digital signal. (4 Marks)
c. The following devices are commonly used in setting up a network
Unshielded twisted pair (UTP) cable, network interface card (NIC), hubs, bridges, switches and
routers.
i. Sketch a network diagram that makes use of all the devices. (6 Marks)
ii. Explain the layer each of the device functions of the open system interconnection (OSI)
reference model. (6 Marks)
QUESTION FIVE – 20 MARKS
a. Determine the hamming distance for the following pairs of codes. (4 Marks)
i. 10000, 01000
ii. 0000, 0000
b. Describe each of the following analogue signal modulation schemes. (4 Marks)
i. Amplitude modulation
ii. Frequency modulation
c. With the aid of a flow sketch, describe the changes a massage undergoes as it traverses each layer
of the open system interconnection model (OSI) (7 Marks)
d. Routers are devices that connect nodes and networks of different architectures by performing
protocol translations. Discuss some of the functions that routers would need to perform in the
following:
i. Connections between dissimilar LANs, one supporting datagram and the other supporting
circuit connections. (3 Marks)
ii. Connections between devices on the same LAN that understand different higher-level
protocols. (2 Marks)
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