Computer Networks Question Paper
Computer Networks
Course:Bachelor Of Computer Science (It Telecommunication)
Institution: Kabarak University question papers
Exam Year:2010
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KABARAK UNIVERSITY
UNIVERSITY EXAMINATIONS
2010/2011 ACADEMIC YEAR
FOR THE DEGREE OF BACHELOR OF COMPUTER SCIENCE
COURSE CODE: COMP 312
COURSE TITLE: COMPUTER NETWORKS
STREAM: SESSION VI &VII
DAY: SATURDAY
TIME 2.00 – 4.00 P.M
DATE: 27/11/2010
INSTRUCTIONS:
1. This question paper has FIVE questions
2. Answer question ONE and any other TWO questions
PLEASE TURNOVER
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QUESTION ONE (30 MARKS) COMPULSORY
(a) Explain the meaning of following terms
i. Firewall
ii. Intranet (4mks)
(b) Distinguish between
i. Backup server and domain controller server
ii. Interior and exterior router (4mks)
(c) Perform the following conversions
i. 16810 to base 2
ii. 10110001012 to base 10 (4mks)
(d) Compare and contrast between a hub and a switch (6mks)
(e) Describe how token passing method of transmission control works (5mks)
(f) i. State Nyquist theorem (2mks)
ii. Determine the maximum channel capacity of a 6 kHz channel that has a
thermal noise of 60dB (5mks)
QUESTION TWO (20 MARKS) ELECTIVE
(a) Explain how a Shielded Twisted cable is designed to cope up with signal flaws (3mks)
(b) Explain the difference a routing table and a forwarding table (4mks)
(c) A school wishes to set up a simple network within a computer lab to connect a number of
computers, a switch and an application server.
i. Among UTP, Coaxial and Fibre optic cables, which one would
recommend for them? (1mk)
ii. Explain four reasons for your choice (4mks)
iii. Give four demerits of the cable chosen above (4mks)
(d) A node that employs ASCII coding system sends out the word Dec! over the network.
Determine the block checksum of the word sent. (5mks)
QUESTION THREE (20 MARKS) ELECTIVE
(a) Explain the meaning of the term encoding scheme (2mks)
(b) Compare and contrast NRZ and NRZ-I encoding schemes wave formats
(4mks)
(c) State the encoding rules and limitations for Manchester encoding schemes
(5mks)
(d) Determine the input value for the following Differential Manchester encoding
scheme V (v) (4mks)
t(s)
(e) Plot a Manchester graph for the input value 00101110 (5mks)
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QUESTION FOUR (20 MARKS) ELECTIVE
(a) Describe a class C IP address (8mks)
(b) Differentiate between Network Layer and Transport Layer of the OSI reference model
(5mks)
(c) Consider the IP address 192.168.10.255
i. Distinguish between TCP and IP (2mks)
ii. Identify the class, Network ID, Host ID and subnet of the address (2mks)
iii. Explain why it is not advisable to assign this address to a node (3mks)
QUESTION FIVE (20 MARKS)
(a) Explain the meaning of the following terms
A token
i. CRC (4mks)
(b) Differentiate between 10Base2 and 100Base5 Ethernet standards (5mks)
(c) Describe a token ring frame format (6mks)
(d) The table below shows the description of aspects of Ethernet technology. Fill in the table
(5mks)
Feature Description
Topology
Signal Mode
Access Method
Specification
Transfer speed
Cable type
Maximum Frame Size
Media
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