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Computer Networks(Dbit 210/ Dcis 121) Question Paper

Computer Networks(Dbit 210/ Dcis 121)

Course:Computer Information Systems And Business Information Technology

Institution: Kenya Methodist University question papers

Exam Year:2011

TIME : 2 HOURS
INSTRUCTIONS Answer Question ONE and any Other TWO Questions
Question 1
a) List and briefly explain two hardware and two software components that a computer network facilitates for sharing. (4Marks)
b) Differentiate between the following computer roles, a server, a client and a peer. (3Marks)
c) In signal transmission, explain the term distortion. (2Marks)
d) Give two functions of an Ethernet network bridge. (2Marks)
e) List two security implementations that can specifically be used to protect communication between two or more network nodes. (2Marks)
f) Compare the security of client-server and peer to peer computer network models. (4Marks)
g) List and explain two multiplexing schemes used in computer networks. (2Marks)
h) A file server offers services that allow users to share files. List two such services.(2Marks)
i) Explain flow control in the logical sub-layer of the data link layer. (2Marks)
j) Explain the term computer network. (2Marks)
k) Using an illustration differentiate between analog and digital signal transmission. (2Marks)
l) Explain the following terms. (3Marks) Amplitude modulation, Frequency modulation and Phase modulation.

SECTION B
Question 2
a) Illustrate and explain the Bus network topology giving both its advantages and disadvantages. (5Marks)
b) List and explain any two merits of digital signal transmission. (4Marks)
c) Explain the carrier sense multiple access as found in the media access sub-layer of the data link layer. (6Marks)
d) Explain the transport layer protocol UDP in detail, including an illustration of its header. (5Marks)

Question 3
a) Explain NFS (network file service) as found in the application layer. (6Marks)
b) List and explain two security attacks that a firewall cannot protect against. (4Marks)
c) List and briefly explain four applications of data communication. (4Marks)
d) List the seven layers of the OSI reference model giving a brief description of its function. (6Marks)

Question 4
a) Explain the computer network model called peer to peer and list the advantages and disadvantages. (5Marks)
b) Switching is the sending of data across different routes in a computer network. There are three types of switching explain each of them briefly. Circuit switching, Message switching, Packet switching. (6Marks)
c) Compare and contrast between a router and a switch. (4Marks)
d) Explain adaptive routing and give two methods that are used to implement it. (5Marks)

Computer Networks(Dbit 210/ Dcis 121) Question Paper

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