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Computer Networks Question Paper

Computer Networks

Course:Bachelor Of Computer Science (It Telecommunication)

Institution: Kabarak University question papers

Exam Year:2012

KABARAK
UNIVERSITY
UNIVERSITY EXAMINATIONS
2011/2012 ACADEMIC YEAR
FOR THE DEGREE OF BACHELOR OF COMPUTER SCIENCE

COMP 312: COMPUTER NETWORKS
DAY: TUESDAY

DATE: 07/08/2012
TIME: 2.00 – 4.00 P.M.

STREAM: Y3S1
INSTRUCTIONS:
1. This question paper has FIVE questions
2. Answer question one and any other two questions

QUESTION ONE (30 MARKS)
(a) Explain the meaning of following terms
i.
CRC
ii.
PCMCIA
iii.
Shannon’s theorem

(6mks)
(b) Distinguish between
i.
Data encryption and data decryption
ii.
CDMA and GSM

(4mks)

(c) One of the categories of networks is client-server. Explain three drawbacks of this
network

(3mks)
(d) Differentiate between cut-through and store-and-forward switching modes
(4mks)

(e) To be assigned an IP address by a DHCP server a node broadcast a request packet in the
network. Which one between TCP and UDP protocols would the network use as
transport protocol? Explain

(3mks)
(f) For each of the following networking issues: MAC, DoS, RJ-45 and HTTP,
i. Write their acronyms in full

(4mks)
ii. Explain their functionalities in networking

(4mks)
iii. State the OSI layer each operate at

(2mks)
Page 1 of 3

QUESTION TWO (20 MARKS)
(a) TCP/IPv6 uses 128-bit address space. Determine the number of maximum address space
for this protocol.

(2mks)
(b) Describe class “A” IP address

(8mks)
(c) Consider the IP address 10110100.11011111. 10110100.11011111 in dotted binary
number format
(i)
Convert and write the number in dotted decimal parts

(5mks)
(ii)
Identity the class, NID, HID and subnet of the IP address

(2mks)
(iii)
Is it advisable to assign the address to a network node? Explain
(3mks)

QUESTION THREE (20 MARKS)
(a) Explain the meaning of the term modal dispersion as in signal transmission
(2mks)
(b) Differentiate between WiFi and 10Base2 network technologies

(4mks)
(c) Fibre optic cables are the most secure and reliable transmission media type. Describe
how fibre optic cables transmit signals.

(5mks)
(d) A channel with 24dB noise transmits signals between 5MHz and 6MHz frequencies.
i.
Determine the maximum capacity the channel can transmit

(5mks)
ii.
Determine the number of signal levels needed to achieve the above capacity if
there were no noise

(4mks)

QUESTION FOUR (20 MARKS)
(a) Describe three ways that a Differential Manchester coding system can achieve

synchronization

(3mks)

(b) Compare and contrast Differential Manchester and Non Return to Zero Inverted (NRZ-I)

encoding schemes wave formats as a means of converting data to signals to be transmitted

over a channel

(4mks)
(c) Determine the input value for the following NRZ-I encoding scheme

(4mks)
V (v)

t(s)

(d) Use the input values obtained in (c) to plot a NRZ, Manchester and differential Manchester

schemes

(9mks)

Page 2 of 3

QUESTION FIVE (20 MARKS)
The network topology setup below with corresponding table of IP addresses shows specifications
for a certain network. The secret word for the routers is trial.

Device
IP Address
Subnet mask
DNS (Name)
Gateway
Name/interface
Sample
192.168.1.3

sample.com

PC
192.168.3.10

192.168.1.3

R1 fa/0/0
192.168.3.1
255.255.255.0
N/A
N/A
S0/0/0
12.168.2.1

N/A
N/A
R2 fa/0/0
192.168.1.1

N/A
N/A
S0/0/0(DCE) 12.168.2.2
255.0.0.0
N/A
N/A

(a) State the gateway for sample server and PC devices

(2mks)
(b) Explain the meaning of the terms
i.
Privileged Mode
ii.
NVRAM
iii.
Static routing

(6mks)
(c) Describe the configurations that have to be made at the S0/0/0 R2 interface
(5mks)
(d) The clock rate for synchronizing R1 and R2 routers is 56000. Write CLI commands for
the two R2 S0/0/0 interface configuration

(7mks)

Page 3 of 3

Computer Networks Question Paper

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