Exam Paper - Pravin Shetty > Resume

chinchillatidyNetworking and Communications

Oct 26, 2013 (3 years and 8 months ago)

93 views


Office Use Only












Monash University


Faculty of Information Technology


Sample

Exam Paper



EXAM CODES:

FIT1005


TITLE OF PAPER:

Networks and Data Communications




EXAM DURATION:

180 minutes writing time


READING TIME:

10 m
inutes


THIS PAPER IS FOR STUDENTS STUDYING AT:

(

tick where applicable)




Berwick



Clayton




Malaysia



South Africa



Caulfield



Peninsula



Candidates must complete this section


STUDENT ID ___ ___ ___ ___ ___ ___ ___ __
_

DESK NUMBER ___ ___ ___ ___


During an exam, you must not have in your possession, a book, notes, paper, calculator, pencil case, or other
material/item which has not been authorised for the exam or specifically permitted as noted below. Any material

or item on your desk, chair or person will be deemed to be in your possession. You are reminded that possession
of unauthorised materials in an exam is a discipline offence under Monash Statute 4.1.

Candidates are reminded that they should have no materia
l on their desks unless its use has been specifically
permitted by the following instructions.


AUTHORISED MATERIALS

CALCULATORS



Y䕓





OPEN BOOK




YES




NO

SPECIFICALLY PERMITTED ITEMS



Y䕓






INSTRUC
TIONS TO CANDIDATES

1.

This Exam consists of:

Part A


20
Multiple Choice Questions (
1 mark per question

is 2
0 marks
)

Part B


7
Questions (
7
0 marks)


Part C


2

Scenario Quest
ion
s

(30 marks)


T
otal
12
0 marks
.

2.

Write your
ID number

and
De
sk number

in the section above.

3
.

Attempt all parts.
Multiple choice answers must be circled on the exam paper.


4
.

This Examination Paper
MUST NOT

be
taken from the Examination Room. It must be placed in the front
of your exam script book.



Part
A



Mul
tiple Choice
Question
s

(20marks)


There is only one correct an
swer for each question;
no marks are deducted for incorrect answers.



Please circle your answers on this sheet


Q1.

Which OSI Model layer

is

the fourth layer above

the
physical layer
?

a)

Sessi
on

b)

Transport

c)

Application

d)

Physical


e)

None of the above


Q2.

Rank the following transmission media (optical fibre, coaxial cable and twisted pair) according
to their channel capacity from the highest to the lowest.

a)

Optical Fi
bre,
C
oaxial
C
able,
T
wisted
P
air.

b)

Optical
F
ibre,
T
wisted
P
air,
C
oaxial cable.

c)

Twisted
P
air,
C
oaxial
C
able,
O
ptical
F
ibre.

d)

Coaxial cable,
O
ptic fibre,
T
wisted
P
air.


e)

None of the above


Q3

As a user’s message moves from the lowest layer to the top layer of the OSI Model,



protocol headers are:


a)

Added

b)

Removed

c)

Rearranged

d)

Modified


e)

None of the above


Q4
.

Which of the following transmission impairments adds unwanted signals to a transmitted
signal?

a)

Attenuation

b)

Delay Di
stortion

c)

Crosstalk

d)

Attenuation Distortion


e)

None of the above


Q5.

What is the bandwidth of a signal that ranges from 35 kHz to 95 kHz?

a)

130 kHz

b)

60 kHz

c)

35 kHz

d)

95 kHz


e)

None of the above


Q6.

A television (TV) transmission
is an exampl
e of which type of transmission?

a)

Simplex

b)

Half duplex

c)

Full duplex

d)

Automatic


e)

None of the above

Part
A



Multiple Choice
Question
s (20marks)


There is only one correct an
swer for each question;
no marks are deducted for incorrect answers.



P
lease circle your answers on this sheet


Q7.

According to Nyquist’s
theorem,
the maximum
transmission
rate (in bps) on a noiseless
channel for a given bandwidth is:

a)

Half the bandwidth

b)

Equal to the highest signal frequency

c)

Twice

highest signal frequency

d)

T
wi
ce the
bandwidth

e)

None of the above


Q8.

In asynchronous transmission:

a)

a start bit is needed before the transmission of a byte

b)

no stop bit is required

c)

a character consists of 5 bits

d)

a stop bit returns the line to the non
-
idle state

e)

None of th
e above


Q9.

In the “Go
-
Back
-
N” ARQ mechanism, the maximum window size for a
k
-
bit sequence number
field in information frames is:


a)

k

b)

k+1

c)

2
k

d)

2
k
-
1


e)

None of the above


Q10.

What topology is illustrated in the diagram below?




a)

Star

b)

Bus

c)

Tree

d)

Ring

e)

None of the above

Part
A



Multiple Choice
Question
s (20marks)


There is only one correct an
swer for each question;
no marks are deducted for incorrect answers.



Please circle your answers on this sheet


Q11.

Whi
ch of the following Ethernet standards does
not

utilize the CSMA/CD access method?

a)

1000 Mbps Ethernet

b)

500 Mbps Ethernet

c)

100 Mbps Ethernet





d)

10 Mbps Ethernet

e)

None of the above


Q12.

Which LAN standard has the highest data rate?

a)

10Base5

b)

10Ba
se
-
T

c)

Twisted Pair Token Ring

d)

FDDI

e)

None of the above


Q13.

Which of the following IP

Network addresses
is
a
reserved

address
?


a)

127
.0.0.0

b)

130
.50.0.0

c)

19
7.65.10.0

d)

4
.0.0.0


e)

None of the above


Q14.

When installing an Ethernet 10BASE
-
T network, wha
t type of cable is used?

a)

Fiber Optic

b)

Coaxial Cable

c)

Twisted Pair

d)

Wireless

e)

None of the above


Q15.

The key requirement/s for a routing function in packet
-
switching networks is/are:

a)

Efficiency

b)

Correctness, Simplicity and Fairness

c)

Optimality, Robustness and St
ability

d)

All of the above

e)

None of the above



Q16.

In alternate routing scheme (circuit
-
switched networks), the responsibility to select the
appropriate route for each call rests on the
:

a)

End station

b)

Routing station or switch at mid
-
point

c)

Originating switch

d)

End station and the originating switch

e)

None of the above
Part
A



Multiple Choice
Question
s (20marks)


There is only one correct an
swer for each question;
no marks are deducted for incorrect answers.



Please circle your answers on this sheet


Q17.

In
pac
ket switched networks that use
distributed routing
:

a)

The central node typically makes use of information obtained from all nodes for the
purpose of forwarding packets

b)

Each node has the

responsibility of selecting an

output link for routing packets as
they
arrive
, based on a routing table

c)

A routing decision is made by
source only

d)

A routing decision is made by the central node based on best performance criteria


e)

None of the above


Q18.

Which of the following sequences best describes the establis
hment, communication and
termination of a communication session using a packet switched network?

a)

Setup,
D
ata transfer,
D
isconnect

b)

Data
T
ransfer,
D
isconnect

c)

Dial,
D
ata
T
ransfer,
D
isconnect

d)

Dial, Setup, Data Transfer

e)

None of the above


Q19.

A typical digital

telephone channel in TDM circuits is allocated a speed of

a)

4 kbps

b)

8 kbps

c)

64 kbps

d)

1.544 Mbps

e)

None of the above


Q20.

Which of the following is
not

a WAN technology?

a)

X.25

b)

Frame Relay

c)

ATM

d)

TCP/IP

e)

None of the above



Part
B



Question
s

(70marks)



Q1.

Discuss
in detail, the reasons why a layered Network Architecture Model is used to construct a
communications network.


(10 marks)


Q2.

In relation to modulation and data encoding:

a)

Define the term modulation.

b)

Given a bit string, 001110101, show via a diagra
m how it can be encoded on to a sine
wave analog signal using Amplitude Shift Keying (ASK).

c)

Define and discuss in detail, using an example to illustrate each, the following
transmission modes:



i)

Simplex


ii)

Half
-
Duplex




ii)

Full
-
Duplex



d)

Define the following characteristics in relation to the simple
sine wave
model for an


a
nalog signal:


i)

Amplitude



ii)

Frequency



iii)

Phase



(2 + 2 + 3 + 3 = 10 marks)



Q3.

In relation to Local Area Networks:

a)

What is the main downfall of the Carrier Sense Multiple Access (CSMA) method?

How do Collision Detection (CD) methods help alleviate this problem?

b)

What fields are contained in a Medium

Access Control (MAC) frame?

Describe
three
of these
.

c)

What are the differences between half and full duplex Ethernet? What happens to the
theoretical transfer rate when a full duplex transmission mode is used?


(3 + 4 + 3 = 10 marks
)


Q4.

a)

Identify the

di
sadvantages of fragmenting data. D
iscuss two
of these
disadvantages.

b)

What is the role of sequencing in a connection
-
oriented data transfer?

c)

Why are global and device
-
level addressing systems necessary?

d)

In what scenarios are priority a
nd QoS (Quality of Service) protocol services useful



(
3 + 2 + 2 + 2 = 10 marks)



Q5.

In relation
to routing in switched networks:


a)

Explain the routing technique known as “flooding
.


b)

What are the main advantages of this technique?

c)

What are the main disad
vantages?


(4 + 3 + 3 = 10 marks)






Q6.

Discuss in detail and compare

the following modes of data transmission

on a communication
link
. Use diagrams
to help illustrate your answers
.


a)

Asynchronous transmission
.

b)

Synchronous transmission
.

(5

+

5

=

10

mark
s)


Q7.

a)

List
three

advantages

of the packet switching technique compared with that of circuit
switching
.


b)

Define the following terms in the context of message delivery over a network, and link
utilization.

i.

Propagation delay
.

ii.

Transmission time
.

iii.

Node d
elay
.


(
4 + 2 + 2 + 2 = 10 marks)

Part C


Scenario Question

(30marks)


Q1.

You have been asked to configure the hardware for a LAN to provide office automation
capabilities for a factory. The Factory Manager has asked you to provide a LAN that will make
use of four IBM compatibles with
128

MB

of memory, two IBM compatibles with
256

MB

of
memory, two IBM compatibles with
512

MB

of memory, a photocopier, a laser printer and two
ink jet printers. In addition, some employees will need to access the LAN from h
ome to
transfer files and to do remote printing.


There are currently no network facilities installed in the factory. Each of the printers is attached
to one particular desktop, and the photocopier is not attached to any computers.


Using a physical star t
opology, draw a network diagram of your proposed LAN. Label all
hardware components in your diagram. Support your network diagram, by providing an
explanation of the following:


i.

equipment, software, and cabling that will be needed to connect each device

to the LAN

ii.

details of configuration of the hardware, software, and communications capabilities
required at the LAN and home user ends of the connection.


Q2.

A company has two large computers connected by a synchronous communication line having a
spee
d of 56kbps. These computers are 300 kilometres apart. Each location also has a LAN. The
company wants to allow all computer users, those connected to the LANs as well as those
connected to the large computers, to be able to communicate. Is the current con
nection
sufficient for the proposed configuration? Why or why not? Explain your answer.



(20 + 10
= 30 marks)



-

END OF EXAM
-