17._CS-12-Networking-1_Evolution_of_Network_1.docx

CLASS: XII SUBJECT: Computer Science
UNIT: Networking - I LESSON: Networking - 1 No of session required: 01
Session Gist of Lesson Expected Learning
Outcomes/ELO
Teaching Learning activities
planned
Suggested material /
Resources
Assessment
strategies
planned/Assignments
Worksheets
1 Networking-1:
Evolution of
Networking:
ARPANET, Internet,
Interspace Different
ways of sending data
across the network
with reference to
switching
techniques (Circuit
and Packet switching).
● Data
Communication
terminologies:
Concept of Channel,
Bandwidth
(Hz, KHz, MHz) and
Data transfer rate
(bps, Kbps, Mbps,
Gbps,
Tbps).
● Transmission
media: Twisted pair
cable, coaxial cable,
optical fiber,
infrared, radio link,
microwave link and
satellite link.
Student will be able to
understand the
evolution of
Networking along
with basics of
Computer
Networking.
Student will learn
 Switching
Techniques
o Circuit
Switching
o Packet
Switching
 Basic
terminologies in
Data
Communication
 Transmission
media
o Guided Media
o Unguided Media
At least 15-20 minutes talk on the
topic
 Evolution of Networking
 A computer network is a
collection of interconnected
computers and other devices to
share data and other resources
(hardware and software
resources).
 Network of networks makes
the internet.
 The technique of sending data
across the network is known as
Switching technique. The three
types of techniques used are
Circuit switching, Packet
switching and Message
switching.
 Communication media is a
transmission media used for
sending data or signal across
the network.
 Link of PPT
https://docs.google.com/present
ation/d/10uv9qq7aK3P8Ktkou
CY0A48Y_lKQPyQOo9rik_8I
OJo/edit?usp=sharing
 Teacher will take this session
Using Lifesize App/ Google
Duo / Google Meet
Students should be
advised to see these
video
https://youtu.be/1VX
_ddArI08
Comparisons /
Differences
(At a Glance)
 Guided Media
https://drive.google.c
om/file/d/1F3NAGS6
6TnEbCe9Xm6kYVp
u_OuD_JMAY/view?
usp=sharing
 Unguided Media
om/file/d/145cgCMU
ptv2amAy1v02n-
jAuzFoztis0/view?usp
=sharing
 Switching
om/file/d/1xovAoZcY
4klUYVLGDZ-
myAQYcU7o3UsM/v
iew?usp=sharing
MCQ’s Questions
(Teacher can select
questions and make
Online Quiz using
Google Forms etc.)
om/file/d/1CJfSUYi
GmrDPklI9VdI-
XieABJ2lHCd5/view
?usp=sharing
Collection of All
CBSE Board
Questions of
Networking
(Teacher can create
Assignment / Tests /
Worksheets for
assessment using this
Question bank)
om/file/d/1sPaht-
p8E9cAZy356OtDU
ZJ2FLpd1_cE/view?
usp=sharing
HOTs / Long
Answers Questions
om/file/d/1_FZ8zwP
2ws7R33eNTM1NQ
ZnsyS5ungP5/view?u
sp=sharing
Worksheet 1
(1 Mark Questions
/ Very Short
Answers / MCQ’s)
Worksheet 2
(CBSE 2 Mark
Questions / Short
Answers)
Worksheet 3
(CBSE Questions
based on Case
Study)
(Click on
Worksheet 1/
Worksheet 2/
Worksheet 3)

Topic: Networking-1
(Evolution of Networking, Switching techniques, Data Communication terminologies, Transmission media)
Name of the Vidyalaya: ________________________________________________________________
Name of the Student: ________________________Class & Sec:______________Roll No:______
(1 Mark Questions / Very Short Answers / MCQ’s / True False / Fill in the Blanks)
1 Fill in the Blanks
a Through ................................ you can establish contact with anyone in the
world.
b ....................... refers to wireless fidelity which enables us to connect to the ISP
without any cable.
c The first network that planted the seed of internet was ................................ .
d Wi-Fi, infrared and Bluetooth are examples of ................................ .
e Interspace is a ................................ .
f The technique of switching in which data is divided into smaller fragments is
called .............. .
g ................................ is a dedicated link between the sender and the receiver.
h ................................ is the measuring unit of speed at which the data transfer
takes place?
Answer (a) Internet (b) Wi-Fi (c) ARPANET (d) Communication Mediums (e) Network
(f) Packet switching (g) Circuit switching (h) bits/second
2 Multiple Choice Questions (MCQs)
a A computer network:
(i) Is a collection of hardware components and computers
(ii) Is interconnected by communication channels
(iii) Allows sharing of resources and information
(iv) All of the above
b Which of these is not a communication channel?
(i) Satellite
(ii) Microwave
(iii) Radio wave
(iv) Wi-Fi
c Which of these is not an example of unguided media?
(i) Optical Fiber Cable
(ii) Radio wave
(iii) Bluetooth
(iv) Satellite
d In which type of switching first the connection is established between sender
and receiver and then the data is transferred?
a. Packet Switching
b. Line Switching
c. Parallel Switching
d. Circuit Switching
e Identify the cable which consists of an inner copper core and a second
conducting outer sheath:
(i) Twisted Pair (ii) Co-axial (iii) Fiber Optical (iv) Shielded Twisted Pair
f In Fiber optic transmission, data is travelled in the form of:
(i) Light (ii) Radio link (iii) Microwave Link (iv) Very low frequency
g Out of the following, Which transmission media has the highest transmission
speed in a network?
(i) Twisted Pair Cable (ii) Co-axial Cable (iii) Fiber Optical
WORKSHEET -1

(iv) Electrical Cable
h A Local telephone line network is an example of
(i) Packet Switched (ii) Line Switched (iii) Circuit Switched
(iv) Bit switched
i Packet switching is based on the principal
a. Stop and Wait
b. Store and Forward
c. Store and Wait
d. Stop and Forward
j The required resources for communication between end systems are reserved
for the duration of the session between end systems in method
a. Packet Switching
b. Line Switching
k In which type of Switching techniques, the resources are allocated on demand?
a. Packet Switching
b. Line Switching
l Out of the following guided media, which is not susceptible to external
interference?
(i) Twisted Pair (ii) Co-axial Cable (iii) Fiber Optical (iv) Electric Wire
m Amit is working as a manager in ABC Ltd. He wants to install CCTV Camera in
every part of multi-storey Building of his office. Select the best wire media to
connect each CCTV camera.
(i) Twisted Pair (ii) Co-axial Cable (iii) Fiber Optical(iv) Electric Wire
n Mohit is a Cable TV operator; he wants to give connection to his customers.
Which type of Cable will be best for Raj to connect his subscribers in the
different areas of City?
a. Ethernet b. Telephone c. Optical Fiber d.Co-axial
3 _______________ is used to provide short-range wireless connectivity between
two electronic devices that within the distance of 4-5 cms.
4 What is the name of earliest form of Internet? Also expand it
5 Which connector is used connect Ethernet Cable to LAN Card?
6 What is Internet? What are the major services offered by Internet?
7 What is Bandwidth? What is the measuring unit of Bandwidth in term of range
of frequencies a channel can pass?
8 Which of the transmission is suitable for the transferring data from one place
to anywhere in the world?
9 What is the difference between Radio wave transmission and Microwave
transmission?
10 Which wireless transmission medium is used for controlling our TV, AC with
Remote?
11 ABC International School is planning to connect all computers, each
spread over a distance of 50 metres. Suggest an economic cable type
having high speed data transfer to connect these computers.
Answer:
Optical Fiber Cable.
12 Which device is used to connect all computers to the internet using
telephone wire?
Answer:
RJ – 45. It is an eight wired connectors used to connect computers on a LAN.

Topic : Networking-1
Name of the Vidyalaya:________________________________________________________________
Name of the Student :________________________Class & Sec:______________Roll No:______
(2 Mark Questions / Short Answers)
1 What is the difference between packet & message switching?
Answer:
Packet Switching Message switching
There is a tight upper limit on the
block size. A fixed size of packet is
specified.
In message switching there was
no upper limit.
All the packets are stored in main
memory in switching office.
In message switching packets are
stored on disk. This increases the
performance as access time is
reduced.
2 What is the difference between Packet switching and circuit switching
techniques?
Answer:
In circuit switching, a dedicated path exists from source to destination while in
packet switching, there is no fixed path.
3 Write two advantages of using an optical Fiber cable over an Ethernet
cable to connect two service stations, which are 200 m away from each
other.
Answer:
Advantages of optical Fiber :
1. Faster speed than Ethernet
2. Lower Attenuation
4 Mahesh wants to transfer data within a city at very high speed. Write the
wired transmission medium and type of network.
Answer:
Wired transmission medium – Optical Fiber cable Type of network – MAN.
5 What is Wi-Fi Card?
Answer:
Wi-Fi cards are small and portable cards that allow the computer to connect to
the internet through a wireless network. The transmission is through the use
of radio waves.
6 Out of the following, which is the fastest
1. wired medium of communication
2. wireless medium of communication
Answer:
1. Wired – Optical Fiber
2. Wireless – Infrared OR Microwave
7 Differentiate between packet switching over message switching?
Answer:
Packet Switching: Follow store and forward principle for fixed packets. Fixes an
upper limit for packet size.
WORKSHEET -2

Message Switching: Follows store and forward principle for complete message.
No limit on block size.
8 Out of the following, categorise the fastest mediums out of Infrared,
Coaxial Cable, Ethernet Cable, Microwave, Optical Fiber in
(i) wired and
(ii) Wireless medium of communication?
Answer:
(i) Wired : Optical Fiber
(ii) Wireless : Infrared OR Microwave
9 Write any two differences between twisted pair and coaxial pair cable.
Answer:
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.
10 Define a network. What is its need?
Answer:
A network is an interconnected collection of autonomous computers that can
share and exchange information.
Need for networking:
(a) Resource sharing: Resources are shared by all computers over the network
for effective utilization.
(b) File sharing: A file in a network can be accessed from anywhere.
11 Write two advantages and two disadvantages of network.
Answer:
Advantages of network:
(a) We can share resources such as printers and scanners.
(b) We can share data and access files from any computer.
Disadvantages of network:
(a) If there is any problem in the server, then no communication can take
place.
(b) Network faults can cause loss of data.
(c) If there is no privacy mechanism used, then the entire network can be
accessed by an unauthorized person.
12 What is ARPANET? What is NSFNET?
Answer:
ARPANET (Advanced Research Project Agency Network) is a project sponsored
by US Department of Defence.
NSFNET, developed by the National Science Foundation, was a high capacity
network and strictly used for academic and engineering research.
13 Why are Fiber optic cables becoming popular?
Answer:
Fiber optic transmission is becoming increasingly popular due to its noise
resistance, low attenuation and high bandwidth capabilities.
14 Write two advantages of using an optical Fiber cable over an Ethernet
cable to connect two service stations which are 200m away from each
other. [CBSE D 2013]
Answer:
Optical Fiber cable guarantees secure transmission and a very high
transmission capacity. Optical Fiber cable is immune to electrical and
magnetic interference.

15 Write two characteristics of Wi-Fi. [CBSE D 2014]
Answer:
(a) It allows an electronic device to exchange data or connect to the internet
wirelessly using microwaves.
(b) Network range of Wi-Fi is much less than other network technologies like
wired LAN.
16 How many switching techniques are there? Explain any one.
Answer:
There are three switching techniques:
(a) Circuit Switching (b) Packet Switching (c) Message Switching
Circuit Switching: In this technique, first the complete physical connection
between two computers is established and then data is transmitted from the
source computer to the destination computer. The entire dedicated line is used
by the caller and the receiver and no other user can use it even if the line
becomes idle. When the data transmission is over, the line is disconnected and
is available for the next communication.
17 What is a communication channel? Name the basic types of
communication channels available.
Answer:
A communication channel is also known as communication media or
transmission media. Communication media can be wireless or wired. Wireless
media is also known as unguided media while wired media is also known as
guided media.
Following are three basic types of communication channels available:
(a) Twisted Pair Cables (b) Coaxial Cables (c) Fiber-optic Cables
18 Define baud, bps and Bps. How are these interlinked?
Answer:
Baud is a unit of measurement for the information-carrying capacity of a
communication channel.
bps (bits per second) refers to a thousand bits transmitted per second.
Bps (Bytes per second) refers to a thousand bytes transmitted per second.
All these terms are measurement units used to refer to the amount of
information travelling through a single channel at any one point of time.

Topic : Networking-1
Name of the Vidyalaya:________________________________________________________________
Name of the Student :________________________Class & Sec:______________Roll No:______
Case Study ( CBSE question of 4 marks, consisting of 1 mark from this topic)
1 Uplifting Skills Hub India is a knowledge and skill community which has an
aim to uplift the standard of knowledge and skills in the society. It is planning
to setup its training centres in multiple towns and villages pan India with its
head offices in the nearest cities. They have created a model of their network
with a city, a town and 3 villages as follows.
As a network consultant, you have to suggest the best network related
solutions for their issues/problems raised, keeping in mind the distance
between various locations and given parameters.
Shortest distance between various location :
VILLAGE 1 to B_TOWN 2 KM
VILLAGE 2 to B_TOWN 1.0 KM
VILLAGE 3 to B_TOWN 1.5 KM
VILLAGE 1 to VILLAGE 2 3.5 KM
A CITY Head Office to B HUB 25 KM
• In Villages, there are community centres, in which one room has been given
as training center to this organization to install computers.
• The organization has got financial support from the government and top IT
companies.
Suggest the best wired medium and draw the cable layout (location to
location) to efficiently connect various locations within the B HUB.
Answer:
Optical Fiber cable is the best for this star topology.
WORKSHEET -3

2 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
The organisation also has inquiry office in another city 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, ii) Microwave, iii) Radio wave
Answer:
(1) Radio waves can be used in hilly regions as they can travel through
obstacles.
3 Trine Tech Corporation (TTC) is a professional consultancy company. The
company is planning to set up their new offices in India with its hub at

Hyderabad. As a network adviser, you have to understand their requirement
and suggest them the best available solutions.
Physical Locations of the blocks of TTC
Block to Block distances (in Mtrs.)
Expected Number of Computers to be installed in each block
Block Computers
Human Resource
Finance
Conference
25
120
90
What will be the best possible connectivity out of the following, you will
suggest to connect the new setup of offices in Bangalore with its London
based office.
• Satellite Link
• Infrared
• Ethernet Cable
Answer:
Satellite link
Block (From) Block (To) Distance
Human
Resource
Conference 110
Human
Resource
Finance 40
Conference Finance 80
4 To provide telemedicine faculty in a hilly state, a computer network is to be
setup to connect 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.
Out of the following what kind of link should be provided to setup this
network :
1. Microwave link,
2. Radio Link,
3. Wired Link?
Answer:
Radio Link
5 Work a lot Consultants are setting up a secured network for their office
campus at Gurgaon for their day-to-day office and web- based activities. They
are planning to have connectivity between three buildings and the head office
situated in Mumbai. Answer the questions after going through the building
positions in the campus and other details, which are given below:

Distances between various buildings :
Building “GREEN” to Building
“RED”
110 m
Building “GREEN” to Building
“BLUE”
45 m
Building “BLUE” to Building “RED” 65 m
Gurgaon Campus to Head Office
1760
km
Number of computers
Building “GREEN” 32
Building “RED” 150
Building “BLUE” 45
Head Office 10
The organization is planning to provide a high speed link with its head
office situated in Mumbai using a wired connection. Which of the
following cables will be most suitable for this job? [CBSE 2012]
1. Optical Fiber
2. Coaxial Cable
3. Ethernet Cable
Answer:
Optical Fiber.
6 Jonathan and Jonathan Training Institute is planning to set up its centre in
Amritsar with four specialised blocks for Medicine, Management, Law courses
along with an Admission block in separate buildings. The physical distances
between these blocks and the number of computers to be installed in these
blocks are given below.
Shortest distances between various locations in metres :
Admin Block to Management Block - 60 mts
Admin Block to Medicine Block - 40 mts
Admin Block to Law Block - 60 mts
Management Block to Medicine Block - 50 mts
Management Block to Law Block 110 - mts
Law Block to Medicine Block - 40 mts
Number of Computers installed at various locations are as follows :
Admin Block - 150
Management Block - 70
Medicine Block - 20
Law Block - 50 [CBSE 2019]

Suggest the most suitable wired medium for efficiently connecting each
computer installed in every building out of the following network cables :
• Co-axial Cable
• Ethernet Cable
• Single Pair Telephone Cable
Answer:
Ethernet Cable

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