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Dcis 121:Introduction To Computer Network Question Paper

Dcis 121:Introduction To Computer Network

Course:Diploma In Computer Science

Institution: Kenya Methodist University question papers

Exam Year:2012

KENYA METHODIST UNIVERSITY

END OF 2ND TRIMESTER 2012 (EVENING) EXAMINATIONS
FACULTY : COMPUTING & INFORMATICS
DEPARTMENT : COMPUTER SCIENCE & BUSINESS INFORMATION
UNIT CODE : DBIT 223/DCIS 121
UNIT TITLE : INTRODUCTION TO COMPUTER NETWORK
TIME : 2 HOURS

Instructions: Answer Question ONE and any Other TWO Questions.

Question One (Compulsory): 30 Marks

Differentiate between any SIX of the following terms.

(18 Marks)

Synchronous and asynchronous data transfer
Serial and parallel transmission
LAN switches and Routers
LAN and WAN
Data communication and Telecommunication
Bit rate and Band Rate
Network topologies and network protocols
Radio Ware and Microwave Transmission

Describe the meaning of the following terms as used in the world of modern telecommunications.

(12 Marks)

Bandwidth
Multiplexity
Modulation

Question Two

Give a detailed illustration of the characteristics of the following THREE cables;

(12 Marks)

Coaxial cable
Twisted fair cable
Fibre optic cable

Calculate the following

(8 Marks)

The frequencies of a radio wave with a wavelength 200 cms.
The wavelength of an EM wave with a frequency of 1.50 x 104 metres.

Question Three

Open system interconnection (OSI) model is a reference model developed by ISO, as a conceptual framework of standards for communication in the network across different equipment and applications by different vendors. It is now considered the primary architectural model for inter-computing and internetworking communications.

Name the seven layers of the OSI model in their proper sequence.

(10 Marks)

Describe the detail any THREE layers of the OSI Model.

(10 Mark)

Question Four
You are line as a network society consultant by xyz company Ltd. Describe when you would propose the following solutions and the type of security threat that may be addressed by each one of them. (20 Marks)

Data encryption
Packet filtering
Antivirus and Antspyware
Access control lists and passwords
VLAN’s and DMZ

Question Five
The computer industry has been gradually integrating with the telecommunications industry. Some telecommunication technology has brought about new possibilities in the world of computing. Discuss these technologies and the new possibilities that have been enabled. (20 Marks)

Dcis 121:Introduction To Computer Network Question Paper

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