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Chapter 8

Networks

Class 8 - Logix Kips ICSE Computer with BlueJ


Fill in the blanks

Question 1

Transmission medium is the physical path through which the message travels from the sender to the receiver.

Question 2

Bluetooth is a communication technology that uses low power radio waves to connect electronic devices wirelessly.

Question 3

A PAN is a computer network that covers a small area of about 10 meters.

Question 4

A Hyperlink is an image, audio, video, graphics or text that connects one web page to another web page.

Question 5

An IP address is a 32 bit address containing a set of four numbers, which varies from 0 to 255.

Question 6

The set of rules that determines how data should be transferred over networks, compressed, and presented on the screen is called Protocol.

State True or False

Question 1

A Crossover Ethernet cable has got both its ends identical to each other.
False

Question 2

Infrared technology can connect only two devices at a time.
True

Question 3

Wi-Fi stands for Wireless Filtering.
False

Question 4

CAN covers an area smaller than MAN.
True

Question 5

ISP provides Internet connection to the users free of cost.
False

Application Based Questions

Question 1

Riya wants to transfer pictures of her recent US trip from her mobile to her computer. Suggest a wireless mode of transmission which she can use for the same.

Answer

Riya can connect her mobile and computer through Bluetooth wireless networking technology. As the mobile phone can be brought in close range to the computer so the transmission range of Bluetooth is well suited for this setup.

Question 2

Mr. Nanda is opening a new branch of his office in Noida. He wants to connect the computers of this branch with the computers of his home branch at Panchkula. Which networking type best suits his requirement?

Answer

As the branches are located in two different cities so Mr. Nanda should use Wide Area Network (WAN) to connect the computers of the two branches.

Question 3

Which type of network will you recommend in a school for data and hardware sharing?

Answer

To connect the computers present in different buildings of the school, a Cluster Area Network (CAN) is best suited.

Multiple Choice Questions

Question 1

Hypertext appears with an underline and is usually in .......... colour.

  1. Green
  2. Red
  3. Blue ✓

Question 2

Which networking device is used to connect multiple computers and computing devices directly to the network using cables?

  1. Switch
  2. Hub ✓
  3. Router

Question 3

A .......... converts digital signals to analog signals and vice versa.

  1. Repeater
  2. Bridge
  3. Modem ✓

Question 4

Cable television is an example of .......... Network.

  1. Metropolitan Area ✓
  2. Campus Area
  3. Wide Area

Question 5

Which one of the following modes of transmission requires the devices to be in a direct line of sight with each other?

  1. Wi-Fi
  2. Bluetooth
  3. Infrared ✓

Answer the following

Question 1

What is a computer network?

Answer

A Computer Network can be defined as a group of computers and other peripheral devices that are linked together for the purpose of sharing data and hardware resources.

Question 2

What is the role of transmission medium in a computer network?

Answer

Transmission medium is the physical path through which the message travels from the sender to the receiver. Twisted pair cable, coaxial cable, fibre optic cable and radio waves are some examples of transmission medium.

Question 3

Write any two advantages of networking.

Answer

Two advantages of networking are:

  1. Reduction in hardware costs — In a network, the hardware devices that are not used very often, like modems, printers, scanners, CD-writers, etc. can be shared. This reduces the cost of the hardware.
  2. Efficiency — In a network, the deletion, modification or upgradation of the software/data is to be done at a single point only. This brings more efficiency and effectiveness into the working system.

Question 4

What is a Coaxial cable? Differentiate between Broadband and Baseband Coaxial cable.

Answer

A Coaxial cable consists of central copper wire surrounded by insulation and then a shield of braided wire. It is used in transmission of video, communications and audio specially in the cable television industry.

Difference between Broadband and Baseband Coaxial cable is that Baseband Coaxial cable supports quick transmission of a single signal at a time and is mainly used for LANs whereas Broadband Coaxial cable transmits multiple signals at the same time and is used for longer distances.

Question 5

Differentiate between the Bluetooth and Infrared wireless technology.

Answer

BluetoothInfrared
Bluetooth uses low power radio waves.Infrared uses infrared waves.
Bluetooth has a transmission range of upto 240 metres.Infrared has a transmission range of 5 metres.
Bluetooth is not limited to line of sight communication.Infrared works only in direct line of sight.

Question 6

What is the utility of Domain Name? Explain with the help of an example.

Answer

Domain name is a unique name given to each website or resource connected to the internet. Domain names are easier to remember than IP addresses since name has strong correlation with the website. For example, to use Google search engine, the domain name is google.co.in and to use Wikipedia, it is wikipedia.org.

Question 7

What is the role of a Gateway in Computer Networks?

Answer

A Gateway is a network point that acts as an entrance to another network using different protocols. It is a shared connection between a local area network and a larger system i.e. WAN. It basically works as the messenger agent that takes data from one system, interprets it and transfers it to another system.

Question 8

Write short notes on each of the following:

i. Wi-Fi
ii. Modem
iii. Cluster Area Network

Answer

Wi-Fi

Wi-Fi stands for Wireless Fidelity. It uses radio waves to create a secure, reliable and fast Wireless Local Area Network (WLAN). The devices require a wireless adapter to connect to the WLAN using WiFi. It is widely used to share an internet connection among the devices connected to the WLAN. Its advantages are:

  1. It can be used to connect to Internet anywhere and anytime and is quickly replacing the wired medium.
  2. It is relatively cheaper compared to the wired medium.
  3. Multiple devices can be connect with WiFi to create a WLAN.

Its limitations are:

  1. Higher power consumption.
  2. Slower speeds than wired medium.
  3. Transmission breaks or slows down when there is noise interference.

Modem

Modem stands for Modulation/Demodulation. Modulation is the process of converting digital signals to analog and Demodulation is the process of converting analog signals to digital i.e. reverse of Modulation. Thus, Modem helps in transmitting and receiving data between devices over a transmission medium like telephone lines, co-axial cables, radio waves, etc. Modem are of two types — internal or built-in modems and external modems.

Question 9

Write two points of differences for each of the following:

i. Hub and Switch
ii. Router and Repeater

Answer

HubSwitch
Ports of hub do not have individual addresses assigned to them.Switch is aware of the addresses assigned to each of its ports.
Hub sends all data it receives to all the connected ports.Switch sends the incoming data it receives only to the correct port.
Performance of Hub is relatively lower than Switch.Performance of Switch is relatively greater than Hub.
RouterRepeater
A Router is a communication device that is used to connect two different networks.A Repeater is a communication device that is used to regenerate a signal.
Routers help the data packets to travel from source to destination over the best route possible.Repeaters help signals to travel longer distances with the same strength or even at a higher power.
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