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Chapter 14 Networking and Open Source Concepts Solutions

Question - 31 : -
Differentiate between packet switching over message switching ?

Answer - 31 : -

Packet Switching : Follow store and forward principle for fixed packets. Fixes an upper limit for packet size.
Message Switching : Follows store and forward principle for complete message. No limit on block size.

Question - 32 : -
What is Trojan Horse ?

Answer - 32 : -

A Trojan Horse is a code hidden in a program, that looks safe but has hidden side effects typically causing loss or theft of data, and possible system harm.

Question - 33 : -
Write any two differences between twisted pair and coaxial pair cable.

Answer - 33 : -

Twisted Pair

Co-axial Cable

Their bandwidth is not as high as coaxial cables.

It has high bandwidth.

A twisted pair consists of two copper wires twisted around each other (each has its own insulation around it) like a double helix.

A coaxial cable consists of a copper wire core covered by an insulating material and a layer of conducting material over that.

Question - 34 : -
Write one advantage of Bus Topology of network, also, illustrate how 4 computers can be connected with each other using star topology of network.

Answer - 34 : -

Cable length required for his topology is the least compared to other networks.
OR
Any other correct advantage of Bus Topology of network.
Illustration of 4 computers connected with each other using star topology of network.

Question - 35 : -
Indian School in Mumbai is starting up the network between its different wings. There are Four Buildings named as SENIOR, JUNIOR, ADMIN and HOSTEL as shown below.:
 
The distance between various buildings is as follows:

ADMIN TO SENIOR

200m

ADMIN TO JUNIOR

150m

ADMIN TO HOSTEL

50m

SENIOR TO JUNIOR

250m

SENIOR TO HOSTEL

350m

JUNIOR TO HOSTEL

350m

Number of Computers in Each Building :

SENIOR

130

JUNIOR

80

ADMIN

160

HOSTEL

50
(b1) Suggest the cable layout of connections between the buildings.
(b2) Suggest the most suitable place (i.e., building) to house the server of this school, provide a suitable reason.
(b3) Suggest the placement of the following devices with justification, i Repeater i Hub/Switch
(b4) The organisation also has inquiry office in another dty about 50-60 km away in hilly region. Suggest the suitable transmission media to interconnect to school and inquiry office out of the following : i Fiber optic cable, i Microwave, i Radiowave

Answer - 35 : -

(b1)
 
(b2) Server can be placed in the ADMIN building as it has the maxium number of computer.
(b3) Repeater can be placed between ADMIN and SENIOR building as the distance is more than 110 m.
(b4) Radiowaves can be used in hilly regions as they can travel through obstacles.

Question - 36 : -

G.R.K InternationalInc. is planning to connect its Bengaluru Office Setup with its Head Office inDelhi. The Bengaluru Office G.R.K. inter-national Inc. is spread across andarea of approx. 1 square kilometer, consisting of 3 blocks – Human Resources,Academics and Administration.
You as a network expert have to suggest answers to the four queries (i) to (iv)raised by them.
Note : Keep the distance’ between blocks and no. of computers in each block inmind, while providing them the solutions.

Shortest distancesbetween various blocks :

Human Resources to Administration

100 m

Human Resources to Academics

65 m

Academics to Administration

110 m

Delhi Head Office to Bengaluru Office Setup

2350 km

Number of Computersinstalled at various blocks are as follows:

BLOCK

No. of Computers

Human Resources

155

Administration

20

Academics

100

Delhi Head Office

20

1.   Suggest the mostsuitable block in the Bengaluru Office Setup, to host the server. Give asuitable reason with your suggestion.

Suggest the cable layoutamong the various blocks wit

Answer - 36 : -

(i) Human Resources because it has maximum number of computers.
(ii)
 
(iii) Switch
(iv) Satellite link

Question - 37 : -

To providetelemedicine faculty in a hilly state, a computer network is to be setup toconnect hospitals in 6 small villages (VI, V2, …, V6) to the base hospital (H)in the state capital. This is shown in the following diagram.

No village is more than 20 km away from the state capital.
Imagine yourself as a computer consultant for this project and answer thefollowing questions with justification :

1.   Out of the followingwhat kind of link should be provided to setup this network :

1.   Microwave link,

2.   Radio Link,

3.   Wired Link ?

2.   What kind of networkwill be formed; LAN, MAN, or WAN ?

3.   Many times doctors atvillage hospital will have to consult senior doctors at the base hospital. Forthis purpose, how should they contact them: using email, sms, telephone, orvideo conference ?

4.   Out of SMTP and POP3which protocol is used to receive emails ?

5.   What are cookies inthe context of computer networks?

6.   Rajeshwari is tryingfor on-line subscription to a magazine. For this she has filled in a form onthe magazine’s web site. When the clicks submit button she gets a message thatshe has left e-mail field empty and she must fill it. For such checking whichtype of script is generally executed; client side script or server-side script?

7.   Mention any onedifference between free-ware and free software.

 

Answer - 37 : -

(i) Radio Link
(ii) MAN
(iii) e-mail
(iv) POP3
(v) Cookies are files that store user information that is used to identify the user when he logs into the system.
(vi) Server-side script.
(vii) Freeware is a software that has the user to get unlimited usage. Free software may be free for a certain period’only.

Question - 38 : -

Rehaana Medicos Centerhas set up its new center in Dubai. It has four buildings as shown in thediagram given below :

Distances between various buildings are as follows:

Accounts to Research Lab

55 m

Accounts to Store

150 m

Store to Packaging Unit

160 m

Packaging Unit to Research Lab

60 m

Accounts to Packaging Unit

125 m

Store to Research Lab

180 m

Number of computers

Accounts

25

Research Lab

100

Store

15

Packaging Unit

60

As a network expert,provide the best possible answer for the following queries :

1.   Suggest a cable layoutof connections between the buildings.

2.   Suggest the mostsuitable place (i.e. buildings) to house the server of this origanization.

3.   Suggest the placementof the following device with justification :
(a) Repeater
(b) Switch/Hub

4.   Suggest a system(hardware/sofware) to prevent unauthorized access to or from the network.

 

Answer - 38 : -

(i)Layout 1

(ii) The most suitable place/building to house the server of this organizationwould be in Research Lab, building as this building contains the maximum numberof computers.
(iii) (a) For layout I, since the cabling distance between Accounts to Store isquite large, so a repeater would ideally be needed along their path to avoid lossof signals during the course of data flow in this route. For layotat2, sincethe cabling distance between Store to Research Lab is quite large, so arepeater would ideally be placed.
(b) In both the layouts, a Flub/Switch each would be needed in all thebuildings to interconnect the group of cables from the different computers ineach building.
(iv) Firewall

 

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