The document provides details about a computer networking lesson plan, including the expected learning outcomes, teaching activities, resources, and assessments. The lesson will cover the evolution of networking from ARPANET to the internet, switching techniques like circuit and packet switching, networking terminology such as bandwidth, and transmission media including wired and wireless options. Students will learn about these topics through a presentation, videos, worksheets, quizzes and assignments using provided question banks and resources.
This document provides an overview of computer networking concepts including:
- Types of network topologies such as star, bus, ring, and mesh.
- Transmission media like twisted pair cable, coaxial cable, optical fiber, radio waves, and satellite links.
- Network devices, protocols, wireless computing, internetworking terms, open source software, security, and viruses.
This document provides an overview of computer networks and networking concepts. It defines key terms like data communication, networks, links, nodes, gateways/routers, and topologies. It discusses factors that affect network security. It also covers the OSI model layers and their functions, as well as network performance metrics like bandwidth and latency. Additional topics include routing, protocols, standards, error detection/correction methods, and LAN architectures/standards.
The document provides an overview of communication and network concepts. It discusses what a network is, the need for networking, and the evolution of networking from ARPANET to the modern Internet. It also describes different switching techniques, data communication terminologies, transmission media, network devices, network topologies, types of networks, common protocols, and wireless/mobile communication. The key topics covered include circuit switching, packet switching, Ethernet cards, hubs, switches, routers, star and bus topologies, local and wide area networks, protocols like TCP/IP, FTP, and wireless data transmission without landlines.
Lesson 5 data communication and networking (136 kb)IMRAN KHAN
This document introduces data communication and computer networks. It discusses how computer networking allows users to share data and programs between computers regardless of location. The objectives are to learn about the basic elements of data communication systems, communication protocols, transmission modes, computer networks, and network types. It describes the basic components of a communication system including a sender, medium, and receiver. Data communication involves the electrical or electromagnetic transmission of encoded data signals across communication channels or media.
Computer networks allow computers to share resources by connecting nodes using telecommunication technologies over digital interconnections. Nodes on a network include devices like personal computers and servers that are identified by hostnames and network addresses. The ARPANET was a pioneering computer network developed in the late 1960s that served as a forerunner to the modern Internet. Computer networks aim to enable resource sharing, improve performance and reliability, allow scalability, and enhance security. Key hardware components of networks include servers, clients, transmission media, and connecting devices. Software components comprise networking operating systems, protocols, and protocol suites. Common cable types for connecting devices are coaxial, twisted-pair, and fiber-optic cables.
Lesson 4 communication and computer network (123 kb)IMRAN KHAN
Communication between computers has increased with advancements in data communication facilities, allowing users to access computers remotely. A computer network connects multiple computers over communication channels to share data and programs across geographical locations. It consists of senders and receivers of messages connected by a medium like cables, wireless signals, or satellites. Protocols define how computers transmit data over the network by sequencing packets, routing them efficiently, and detecting and correcting errors.
The document provides an overview of optical fiber communication systems and synchronous digital hierarchy (SDH) networks. It discusses the advantages of optical fiber over traditional communication mediums, including higher bandwidth and lower attenuation. It also outlines the history of optical communication networks, from early generations with limitations like dispersion and lower bit rates, to current networks that use single-mode fiber and technologies like SDH to achieve multi-gigabit transmission over long distances with minimal losses. The objectives are to understand SDH concepts, network applications, architectures, and other aspects relevant to designing and operating efficient SDH transmission networks.
This document provides an overview of computer networking concepts including:
- Types of network topologies such as star, bus, ring, and mesh.
- Transmission media like twisted pair cable, coaxial cable, optical fiber, radio waves, and satellite links.
- Network devices, protocols, wireless computing, internetworking terms, open source software, security, and viruses.
This document provides an overview of computer networks and networking concepts. It defines key terms like data communication, networks, links, nodes, gateways/routers, and topologies. It discusses factors that affect network security. It also covers the OSI model layers and their functions, as well as network performance metrics like bandwidth and latency. Additional topics include routing, protocols, standards, error detection/correction methods, and LAN architectures/standards.
The document provides an overview of communication and network concepts. It discusses what a network is, the need for networking, and the evolution of networking from ARPANET to the modern Internet. It also describes different switching techniques, data communication terminologies, transmission media, network devices, network topologies, types of networks, common protocols, and wireless/mobile communication. The key topics covered include circuit switching, packet switching, Ethernet cards, hubs, switches, routers, star and bus topologies, local and wide area networks, protocols like TCP/IP, FTP, and wireless data transmission without landlines.
Lesson 5 data communication and networking (136 kb)IMRAN KHAN
This document introduces data communication and computer networks. It discusses how computer networking allows users to share data and programs between computers regardless of location. The objectives are to learn about the basic elements of data communication systems, communication protocols, transmission modes, computer networks, and network types. It describes the basic components of a communication system including a sender, medium, and receiver. Data communication involves the electrical or electromagnetic transmission of encoded data signals across communication channels or media.
Computer networks allow computers to share resources by connecting nodes using telecommunication technologies over digital interconnections. Nodes on a network include devices like personal computers and servers that are identified by hostnames and network addresses. The ARPANET was a pioneering computer network developed in the late 1960s that served as a forerunner to the modern Internet. Computer networks aim to enable resource sharing, improve performance and reliability, allow scalability, and enhance security. Key hardware components of networks include servers, clients, transmission media, and connecting devices. Software components comprise networking operating systems, protocols, and protocol suites. Common cable types for connecting devices are coaxial, twisted-pair, and fiber-optic cables.
Lesson 4 communication and computer network (123 kb)IMRAN KHAN
Communication between computers has increased with advancements in data communication facilities, allowing users to access computers remotely. A computer network connects multiple computers over communication channels to share data and programs across geographical locations. It consists of senders and receivers of messages connected by a medium like cables, wireless signals, or satellites. Protocols define how computers transmit data over the network by sequencing packets, routing them efficiently, and detecting and correcting errors.
The document provides an overview of optical fiber communication systems and synchronous digital hierarchy (SDH) networks. It discusses the advantages of optical fiber over traditional communication mediums, including higher bandwidth and lower attenuation. It also outlines the history of optical communication networks, from early generations with limitations like dispersion and lower bit rates, to current networks that use single-mode fiber and technologies like SDH to achieve multi-gigabit transmission over long distances with minimal losses. The objectives are to understand SDH concepts, network applications, architectures, and other aspects relevant to designing and operating efficient SDH transmission networks.
This document contains a series of questions and answers related to computer networking and communication technologies. It begins with 26 very short answer questions testing knowledge of topics like domain names, web hosting, packet vs message switching, protocols, cloud computing, Wi-Fi characteristics, mobile technologies, and network topologies. It then includes 17 short answer questions requiring 1-2 sentences, and 12 short answer questions requiring more explanation. The questions cover additional topics such as network cable types, IP addresses, HTTP, cookies, spam, and cyber crimes.
This document provides an overview of communication networks, including:
1. Communication networks are composed of nodes and branches to facilitate the movement of information. Nodes are connection points and branches are transmission mediums like wires or radio channels.
2. There are different types of communication networks including telephone networks, computer networks, broadcast networks, and integrated networks. Telephone networks traditionally used circuit switching while computer networks use packet switching.
3. Communication networks are organized hierarchically, with the core network carrying the most traffic and access networks connecting individual users. The core network uses high-capacity optical fiber transmission.
This document discusses networking technology and computer networks. It defines key concepts like data communication, transmission modes, communication media, computer network components and services. Data can flow in simplex, half-duplex or full-duplex transmission modes. Communication media includes bounded media like twisted pair cables and coaxial cables, and unbounded media like wireless transmission methods. Computer networks allow interconnected computers to share resources and communicate. Basic network services include file, print, message and application services.
This document discusses routing strategies in delay tolerant networks (DTNs) using wireless sensor network (WSN) nodes for localization applications. It first provides background on WSNs and DTNs, and then reviews common DTN routing protocols like epidemic routing, PROPHET, spray and wait, and MaxProp. The aim of the dissertation is to propose a new routing protocol for DTNs using WSN nodes where GPS is unavailable. It discusses using a hybrid of knowledge-based and additional node-based routing. The document outlines simulating the proposed filtered flooding protocol in NS-2 to evaluate delivery ratio and delay for a mining activity scenario. Results show delivery ratio is high for small networks but decreases with more nodes, while delay is
It a a complete ppt explaining the basics of computer networking. It Includes topics like :
1. Types of Network
2. Protocols
3. Threats to network
4. Security of Network
etc
This document provides an introduction to computer networks module. It begins by defining networks and listing the benefits of computer networks such as file sharing, sharing devices, sharing internet access, speed, cost, security, centralized software management, and electronic mail. It then identifies common network devices like hubs, network interface cards, routers, connectors, and modems. It also discusses different types of computer networks including local area networks (LAN), metropolitan area networks (MAN), and wide area networks (WAN). The document defines different network topologies such as star, ring, and bus networks. Finally, it covers current network technologies like Wi-Fi and Bluetooth. The overall goal of the module is for students to understand computer networks at a basic
Networks allow computers to connect and share resources. The document defines networks and their benefits, as well as the devices needed for networks. It describes different types of computer networks including LANs, MANs, and WANs. Network topologies like star, ring, and bus are also explained. Current networking technologies such as Wi-Fi and Bluetooth are discussed. The document is an introductory module on networks and aims to define key terms and concepts for students.
The document discusses various topics related to computer networks including network topologies, physical transmission mediums like twisted pair, coaxial cable and optical fiber, wireless transmission methods like radio waves and infrared, networking devices, internet protocols, and the growth and structure of the internet. It provides information on common network architectures, technologies, and software used to connect devices globally.
This document summarizes different aspects of data communication including analogue vs digital signals, the basic needs of data communication like messages and protocols, different transmission mediums like cables, microwaves and satellites. It also discusses computer networks based on geographical area like LAN, WAN, MAN and the internet. Finally, it covers different network topologies like hierarchical, bus, star, ring and hybrid along with their advantages and disadvantages.
This document provides an overview of key concepts in computer networks and communication. It defines what a network is, discusses the need for networking and sharing of resources, and outlines the evolution of early networks like ARPANET and NSFNET into the modern Internet. It also covers network topologies, transmission media, switching techniques, common network devices, and communication protocols.
[Mcq] computer communication networks lmt2raghad mejeed
The document contains 33 multiple choice questions about computer communication networks. It covers topics like the layers of the OSI model, specifically the physical layer. It also discusses different types of transmission media like twisted pair cable, coaxial cable, optical fiber and their characteristics. Network topologies like star, bus, ring and technologies like multiplexing - TDM, FDM are explained through the MCQ questions.
This document provides information about data communication and computer networks. It defines data communication as the transmission of electronic data from one computer to another. It also defines internet and computer networks. It discusses reasons for computer networks like sharing files and accessing the internet. It describes different types of networks like LAN, WAN, WLAN and network topologies like star, ring and bus. It also includes activities like drawing network topologies and explaining the importance of computer networks.
Ccn(Data communication and networking) edited solution-manual suitable to be ...Vishal kakade
This document provides solutions to review questions and exercises related to network models and data link control. It begins with solutions to review questions on network models, including definitions of the OSI and Internet models. It then provides solutions to exercises on typical network examples like telephone and cable networks. Finally, it discusses data link control protocols like Stop-and-Wait ARQ, Go-Back-N ARQ, and Selective-Repeat ARQ, and provides solutions to related exercises.
The document provides an overview of telecommunications and networking concepts including:
- Different types of networks including personal area networks, local area networks, metropolitan area networks, and wide area networks. The largest example of a WAN is the Internet.
- Network architectures including client-server, peer-to-peer, and hybrid architectures. A hybrid architecture combines elements of client-server and peer-to-peer.
- Network topologies such as bus, star, ring, mesh, tree, and hybrid topologies. A mesh topology connects all nodes to each other.
- Network media including wired media like twisted pair, coaxial, and fiber optic cables and wireless transmission using radio, microwave, and Bluetooth. F
The document discusses computer networks and data communication. It defines a computer network as a group of interconnected computers that allows sharing of resources and information. The key components of a data communication system are sender, receiver, message, medium, and protocol. Communication can be simplex, half-duplex or full-duplex depending on the direction of data flow. Common network topologies include bus, star, ring and mesh. Local area networks (LANs) connect devices within a building, metropolitan area networks (MANs) span a city, and wide area networks (WANs) encompass large geographic areas or the entire world. The Internet is an example of interconnected networks.
This document discusses data communication and computer networks. It defines data communication as the exchange of data between devices via transmission medium. A data communication system has five components: sender, receiver, message, medium, and protocol. Communication can be simplex, half-duplex, or full-duplex. The document then discusses networks, defining them as connected devices and discussing LANs (local area networks), MANs (metropolitan area networks), and WANs (wide area networks). It also covers network topologies like mesh, star, bus, ring and hybrid configurations.
This document discusses data communication and computer networks. It covers the following key points:
- Data communication systems have five components: a sender, receiver, message, medium, and protocol. Communication can be simplex, half-duplex, or full-duplex.
- A computer network connects devices like computers and allows them to share resources and information. Common network types include local area networks and the Internet. Networks use distributed processing and must meet criteria for performance, reliability, and security.
- Physical network topologies include mesh, star, bus, and ring configurations. A topology defines how devices are linked together physically in a network.
Computer Networks Unit 1 Introduction and Physical Layer Dr. SELVAGANESAN S
This document discusses data communication and computer networks. It defines data communication as the exchange of data between devices via transmission medium. A data communication system has five components: sender, receiver, message, medium, and protocol. Communication can be simplex, half-duplex, or full-duplex. The document also defines networks, explaining that a network allows interconnected devices to communicate and share resources. Local area networks (LANs), metropolitan area networks (MANs), and wide area networks (WANs) are described as the main categories of networks.
A network connects devices through communication links. A node can be a computer, printer, or other device capable of sending and receiving data from other nodes. There are different types of network topologies that connect nodes in different configurations, such as a star, mesh, ring, or bus topology. Networks also use various transmission media like twisted pair cable, coaxial cable, or fiber optic cable to transmit signals between nodes. Wireless networks also connect nodes using radio waves without physical cables. Network protocols and standards define rules for communication between nodes to ensure interoperability.
This document announces the winners of the 2024 Youth Poster Contest organized by MATFORCE. It lists the grand prize and age category winners for grades K-6, 7-12, and individual age groups from 5 years old to 18 years old.
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This document summarizes different aspects of data communication including analogue vs digital signals, the basic needs of data communication like messages and protocols, different transmission mediums like cables, microwaves and satellites. It also discusses computer networks based on geographical area like LAN, WAN, MAN and the internet. Finally, it covers different network topologies like hierarchical, bus, star, ring and hybrid along with their advantages and disadvantages.
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1. 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
https://drive.google.c
om/file/d/145cgCMU
ptv2amAy1v02n-
jAuzFoztis0/view?usp
=sharing
Switching
https://drive.google.c
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.)
https://drive.google.c
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)
https://drive.google.c
om/file/d/1sPaht-
p8E9cAZy356OtDU
ZJ2FLpd1_cE/view?
usp=sharing
HOTs / Long
Answers Questions
https://drive.google.c
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)
2. 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
3. (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
c. Parallel Switching
d. Circuit Switching
k In which type of Switching techniques, the resources are allocated on demand?
a. Packet Switching
b. Line Switching
c. Parallel Switching
d. Circuit 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.
4. 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:______
(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
5. 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.
6. 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.
7. 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:______
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
VILLAGE 1 to VILLAGE 3 4.5 KM
VILLAGE 2 to VILLAGE 3 2.5 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
8. 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
9. 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:
10. 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]
11. 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