class 8 CBSE computer unit 1 networking exercise solved questions and answers
Class 8 Computer Chapter 1 Let us Explore Computer Network Question Answer Notes
DAV Class 8 Computer Chapter 1 Let us Explore Computer Network Question Answer Notes Solution by Expert Computer Teacher. DAV Class 8 Computer 2nd Chapter Let us Explore Computer Network for Students of DAV Schools.
Lesson No 1
Let us Explore Computer Networks
(Q1) Fill in the blanks :-
(1) Communication means the ability of conveying thoughts, ideas and everything else that needs to experienced or conveyed.
(2) Each computer has its own keyboard, mouse, scanner and printer which are called as
Peripheral devices.
(3) The collection of two or more computers connected together in order to communicate and share the data and information are called computer networks.
(4) The computers that share and receive data from servers are called as Clients.
(5) Modem is the device which are used for data transfer from one computer network to another computer network through telephone lines.
(6) Internet is a global (wide area) network connecting millions of computers.
(Q2) State whether the following statements are True or False :-
(1)The abbreviation of MoDem is Modulation and Demodulation. True
(2) Router is the device which is used in networking that helps in jointing the more than one networks together. True
(3) A wireless network is a network which uses networking cables to connect devices (computers, printers, scanners etc). False
(4) Bluetooth is the wireless technology which uses radio frequencies to transmit information over a short distances. True
(5) Radio waves are the electromagnetic signals that are transmitted by an antenna. True
(Q3) Match the following Column A with Column B :-
Sr. No
Column A Column B Answers 1) Wired Network Uses radio waves (RF) to allows two or more devices to communicate with one another In this network, networking cables are been used for connecting the devices like (computers, printers, scanners) etc
2)
Radio waves The cable that is used to connect the two devices like computers and switch etc directly. Electromagnetic signals which are transmitted by an antenna 3) Coaxial cables In this network, networking cables are been used for connecting the devices like (computers, printers, scanners) etc. A cable that consists of central copper wire surrounded by an outer jacket.
4)
Twisted Pair Electromagnetic signals which are transmitted by an antenna The cable that is used to connect the two devices like computers and switch etc directly 5) Wi-Fi A cable that consists of central copper wire surrounded by an outer jacket. Uses radio waves (RF) to allows two or more devices to communicate with one another
(Q4) Answer the following questions in one or two sentences each :-
(1) What is a Computer Network?
Ans:- Computer network is the process or method of connecting one or more devices/computers together in a network for the purpose of sharing the hardware devices or for the communication means.
(2) What do you know about Bluetooth and Infrared waves?
Ans :- (a) Bluetooth :- Bluetooth is a form of technology in which there is no existence of wires or cables. This technology makes use of radio frequencies for sending and receiving of data or information over a short distance. Bluetooth enables in getting connected with many devices at a same time. Bluetooth frequencies can range upto 10 metres or less than it.
(b) Infrared waves :- Infrared wave is a method of communicating with the devices that is not very far way from each other. For ex :- Remote control of a TV or Remote control of a Toy car etc. Infrared waves makes use of infrared light for getting connected among the two devices. Infrared waves works over a short distance and is distracted by the noise or heat. In such methods, two devices can be communicated/connected with each other in a time.
(3) What is an Internet?
Ans :- Internet is a connection of millions computers across the globe (world wide) in a network with the intention of communication purpose or for sharing of information amongst each other.
(4) What do you understand by WIMAX
Ans:
WIMAX stands for Worldwide Interoperability for Microwave Access. WIMAX operates similar to the Wi-Fi and is much faster in its operation speed. Generally WIMAX is used in large areas or for large cites. WIMAX operates/covers at the distance of 30 miles having the speed as 30 mbps (mega bytes per second).
(5) State the difference between the Wired Network Technology and Wireless Network Technology?
Ans :- The difference between the Wired Network Technology and Wireless Network Technology are as followed :-
(a) Wired Network Technology :- In this network technology, the cables or wires are been made used for connecting the devices like printer, scanner, computers etc. In the Wired Network technology, the information or data is sent between the connected devices with the help for wires or cables. Coaxial cables, Optical Fiber cables, Twisted pair cables are different types of cables which are used in a Wired network as per the need.
(b) Wireless Network Technology :- This network performs of the standard rules which means no cables or wires are been made used for connecting the computers or any devices together. In this wireless network technology, the computers or devices are connected to each other with the help of radio signals, microwave signals, satellites etc. The information or data is sent from one device to the other with the help of radio signals, microwave signals, satellites. Radio link, Microwave, Satellite link, Infrared, Bluetooth etc are the different means which are used for sharing and transferring of data or resources in a wireless network.
(6) What is a Satellite Communication
Ans :- Such type of communication is mostly used in the world, where the user can send the signal to anywhere within the earth. The signal can reach anywhere to the earth, if incase the signal is sent to the satellite, it returns back to the earth or if it does not returns back to the earth, then the signal from one satellite goes to the other. The satellite communication is mostly used by television broadcastings etc.
(Q5) Answer the following questions in brief :-
(1) Explain the different types of Computer Networks
Ans :- The different types of Computer Networks are LAN (Local Area Network), WAN (Wide Area Network), MAN (Metropolitan Area Network).
(a) LAN :- The abbreviation of LAN is Local Area Network which means this network is used to connect the computers and devices to each other at a very limited (small) geographical area i.e is school computer lab, home, office building, or within a buildings. The devices that are connected into the LAN network are called as Nodes. By making use of cables Nodes are been connected to the LAN.
(b) MAN :- MAN stands for Metropolitan Area Network that is established in a metropolitan area such as city or tow. A MAN typically includes one or more LAN but covers a smaller area than a WAN. Telephone companies, cable television operators, and other organizations makes use of MAN network.
(c) WAN :- The abbreviation of WAN is Wide Area Network which means this network is used to connect the computers to each other who located at a very far distance say globally. The data/information can be exchanged/transferred to each other (computers connected into a network) all over the world. In WAN connection the computers are connected to each other with the help of cables, telephone lines, fibre optics, microwaves or satellites. Connecting the computers in WAN network is a very difficult task, as there can be a probability of faults or short circuits arises if in case the wires/cables breaks down. As compared to other networks the speed is very low. Internet can be the perfect example of WAN.
(2) What do you understand by Wi-Fi
Ans :- It is the wireless technology, which is used for connecting to the internet within one room, building, hotel, hospital, schools or offices etc. The abbreviation of Wi-Fi is Wireless Fidelity which makes uses of radio waves and allows one or more than two devices to connect with each other. Such type of technology helps in connecting the devices like Smartphones, Computers, tablets etc to the internet. We should always make our Wi-Fi connection secured from the accessing of unauthorized users which should be protected by the password.
(3) Write the types of Internet services in brief
Ans :- Some types of internet services are as followed :-
(a) Dial up :- This service clearly states the slowest type of Internet connection and can be used only in the areas where the internet service is needed. Internet cannot be used at the same time when the dial is used along with the phone line termed as telephone line.
(b) DSL :- Nowadays, Broadband connections by the DSL services for the faster speed as compared to Dial up service. DSL also gets connected to the internet with the help of phone line and the phone line and the internet can be used at the same time. Not like the Dial up.
(c) Cable :- 
This service is much easier in connecting the Internet with the Cable TV. As comparison is made between the both i.e is Dial up and DSL, cable service makes use of the broad band connection, which is much faster than these both services.
(d) Satellite :- In this type service, broad band connection is used which does not need
any cables or phone lines. In such type of services broad band gets connected to the internet through the man-made satellite which is orbiting the earth. Such connection are widely used around the world but can be affected/disturbed according to the weather or climatic changes. These connections are slower than the DSL or cable.
(3) 3G and 4G :- This service is mostly used in the devices such as mobile phone, tablets etc and gets connected to it with the help of ISP’s network. As the comparison is made between the Cable or DSL and 3G and 4G services, such service’s connection is very slow than Cable or DSL. 3G and 4G services are nowadays popularly used.
(4) What do you mean by Twisted Pair cables, Coaxial cables, Fiber optic cables? Write down their advantages and disadvantages.
Ans:- The different types of cables are Twisted Pair, Coaxial cable and Fiber Optic cables etc are explained below along with their advantages and disadvantages
Twisted Pair Cables :- Shielded and Unshielded are the two types of twisted pair cables which are used for networking. Such type of cable is used for connecting the two network devices (computer, switches etc) directly. Ethernet cable is the perfect example of Twisted Pair cables.
Advantages of Twisted Pair cables
- This cables transfers the data at a very high speed and is much cheaper.
- This cables makes less use of electricity.
- This cable is very simple to use or install.
Disadvantages of Twisted Pair cables
- If incase there is any problem in the cable, so its very complicated to detect the fault/problem of the cable.
- For using this cables (Ethernet), there must be the presence of the Ethernet cable inside the computer.
Coaxial Cables :- The coaxial cable is the central copper wire which is been covered by the outer jacket. It is widely used by the Cable television companies in connecting the Television set with the antenna.
Advantages of Coaxial cables
- This cables are no much costly and carries the data over the long distance more easily.
- This cable has noisy immune due to its thick outer covering.
- Such cables are light in weight, and easy and flexible to work with.
- As compared to the Twisted pair cables, this cables are more cable of interference and attenuation in the terms of loss in the strength of the signal.
Disadvantages of Coaxial cables
- This cables are consisting of copper metal wire which is easily breakable.
- Some of the coaxial cables are so thick, which cannot bend properly /easily and results difficulty in installation and maintainance.
Fiber Optic Cables :- This cable makes use of glass thread (fibers) for data transfer. Each of the glass threads of the cable is much capable of transferring of data (messages) in the form of light waves. As this cable is made up of glass, such cable is bendable.
(5) Name the devices which are required for connecting different devices in a network?
Ans :- The devices which are required for connecting the different devices in a network are as follows :-
(a) Cables :- For connecting the computers and other devices in a networks, the cables such as flexible metal or fibre optic wires are been made use of.
(b) Network Interface Card (NIC) :- You can easily connect the connect the computer to the network as Network Interface Card (NIC) is placed/installed on the mother board inside the system unit. It can be added for each client and server computers. NIC is also known as Printed Circuit Board (PCB). There are two kinds of Network Interface Card (NIC) which are:-
Ethernet Card :- In this type of card, for data transmission ethernet cables and connectors are been made used.
Wireless Card :- In this type of card, use of cables or connectors are not made. Here for the data transmission, the use of antennas is made which creates radio waves technology.
(c) Switches :- 
HUB is also called as Switch. It is used for connecting many computers in a single network. In the hub, the duplication of packets (data) that is received at one port and is distributed to the other ones. Hence the data is shared within all the connected devices those are connected to the hubs/switches.
(d) Modem :- The full of MoDem is Modulator and Demodulator which is a hardware device. This devices transfers the data from one computer to the another within the computer network. The computer networks work in the digital form whereas modem makes use of the modulation technology for transferring of messages over the phonelines. During the data transferring the modem converts the information from digital to analog mode at the transferring end whereas the Demodulator converts the information from analog mode to the digital mode at the receiving end.
(e) Routers :- It is a device that is used to analyse, receive and forward the data in the network or to the another one (network). In the network whatever the data packets its receiving, Routers are makes a way for the forwarding.
For further update follow net explanations home page
My name is Bishal Sutradhar. I'm From West Bengal, India. Currently Working in this Company. Have 2+ years of experience in the field. Skilled in Internet Explorer, Web Development. Educational Qualification: Graduate.
DAV Class 8 Computer Chapter 1 Let us Explore Computer Network Question Answer Notes Solution by Expert Computer Teacher. DAV Class 8 Computer 2nd Chapter Let us Explore Computer Network for Students of DAV Schools.
Lesson No 1
Let us Explore Computer Networks
(Q1) Fill in the blanks :-
(1) Communication means the ability of conveying thoughts, ideas and everything else that needs to experienced or conveyed.
(2) Each computer has its own keyboard, mouse, scanner and printer which are called as
Peripheral devices.
(3) The collection of two or more computers connected together in order to communicate and share the data and information are called computer networks.
(4) The computers that share and receive data from servers are called as Clients.
(5) Modem is the device which are used for data transfer from one computer network to another computer network through telephone lines.
(6) Internet is a global (wide area) network connecting millions of computers.
(Q2) State whether the following statements are True or False :-
(1)The abbreviation of MoDem is Modulation and Demodulation. True
(2) Router is the device which is used in networking that helps in jointing the more than one networks together. True
(3) A wireless network is a network which uses networking cables to connect devices (computers, printers, scanners etc). False
(4) Bluetooth is the wireless technology which uses radio frequencies to transmit information over a short distances. True
(5) Radio waves are the electromagnetic signals that are transmitted by an antenna. True
(Q3) Match the following Column A with Column B :-
Sr. No | Column A | Column B | Answers |
| 1) | Wired Network | Uses radio waves (RF) to allows two or more devices to communicate with one another | In this network, networking cables are been used for connecting the devices like (computers, printers, scanners) etc |
2) | Radio waves | The cable that is used to connect the two devices like computers and switch etc directly. | Electromagnetic signals which are transmitted by an antenna |
| 3) | Coaxial cables | In this network, networking cables are been used for connecting the devices like (computers, printers, scanners) etc. | A cable that consists of central copper wire surrounded by an outer jacket. |
4) | Twisted Pair | Electromagnetic signals which are transmitted by an antenna | The cable that is used to connect the two devices like computers and switch etc directly |
| 5) | Wi-Fi | A cable that consists of central copper wire surrounded by an outer jacket. | Uses radio waves (RF) to allows two or more devices to communicate with one another |
(Q4) Answer the following questions in one or two sentences each :-
(1) What is a Computer Network?
Ans:- Computer network is the process or method of connecting one or more devices/computers together in a network for the purpose of sharing the hardware devices or for the communication means.
(2) What do you know about Bluetooth and Infrared waves?
Ans :- (a) Bluetooth :- Bluetooth is a form of technology in which there is no existence of wires or cables. This technology makes use of radio frequencies for sending and receiving of data or information over a short distance. Bluetooth enables in getting connected with many devices at a same time. Bluetooth frequencies can range upto 10 metres or less than it.
(b) Infrared waves :- Infrared wave is a method of communicating with the devices that is not very far way from each other. For ex :- Remote control of a TV or Remote control of a Toy car etc. Infrared waves makes use of infrared light for getting connected among the two devices. Infrared waves works over a short distance and is distracted by the noise or heat. In such methods, two devices can be communicated/connected with each other in a time.
(3) What is an Internet?
Ans :- Internet is a connection of millions computers across the globe (world wide) in a network with the intention of communication purpose or for sharing of information amongst each other.
(4) What do you understand by WIMAX
Ans:
WIMAX stands for Worldwide Interoperability for Microwave Access. WIMAX operates similar to the Wi-Fi and is much faster in its operation speed. Generally WIMAX is used in large areas or for large cites. WIMAX operates/covers at the distance of 30 miles having the speed as 30 mbps (mega bytes per second).
(5) State the difference between the Wired Network Technology and Wireless Network Technology?
Ans :- The difference between the Wired Network Technology and Wireless Network Technology are as followed :-
(a) Wired Network Technology :- In this network technology, the cables or wires are been made used for connecting the devices like printer, scanner, computers etc. In the Wired Network technology, the information or data is sent between the connected devices with the help for wires or cables. Coaxial cables, Optical Fiber cables, Twisted pair cables are different types of cables which are used in a Wired network as per the need.
(b) Wireless Network Technology :- This network performs of the standard rules which means no cables or wires are been made used for connecting the computers or any devices together. In this wireless network technology, the computers or devices are connected to each other with the help of radio signals, microwave signals, satellites etc. The information or data is sent from one device to the other with the help of radio signals, microwave signals, satellites. Radio link, Microwave, Satellite link, Infrared, Bluetooth etc are the different means which are used for sharing and transferring of data or resources in a wireless network.
(6) What is a Satellite Communication
Ans :- Such type of communication is mostly used in the world, where the user can send the signal to anywhere within the earth. The signal can reach anywhere to the earth, if incase the signal is sent to the satellite, it returns back to the earth or if it does not returns back to the earth, then the signal from one satellite goes to the other. The satellite communication is mostly used by television broadcastings etc.
(Q5) Answer the following questions in brief :-
(1) Explain the different types of Computer Networks
Ans :- The different types of Computer Networks are LAN (Local Area Network), WAN (Wide Area Network), MAN (Metropolitan Area Network).
(a) LAN :- The abbreviation of LAN is Local Area Network which means this network is used to connect the computers and devices to each other at a very limited (small) geographical area i.e is school computer lab, home, office building, or within a buildings. The devices that are connected into the LAN network are called as Nodes. By making use of cables Nodes are been connected to the LAN.
(b) MAN :- MAN stands for Metropolitan Area Network that is established in a metropolitan area such as city or tow. A MAN typically includes one or more LAN but covers a smaller area than a WAN. Telephone companies, cable television operators, and other organizations makes use of MAN network.
(c) WAN :- The abbreviation of WAN is Wide Area Network which means this network is used to connect the computers to each other who located at a very far distance say globally. The data/information can be exchanged/transferred to each other (computers connected into a network) all over the world. In WAN connection the computers are connected to each other with the help of cables, telephone lines, fibre optics, microwaves or satellites. Connecting the computers in WAN network is a very difficult task, as there can be a probability of faults or short circuits arises if in case the wires/cables breaks down. As compared to other networks the speed is very low. Internet can be the perfect example of WAN.
(2) What do you understand by Wi-Fi
Ans :- It is the wireless technology, which is used for connecting to the internet within one room, building, hotel, hospital, schools or offices etc. The abbreviation of Wi-Fi is Wireless Fidelity which makes uses of radio waves and allows one or more than two devices to connect with each other. Such type of technology helps in connecting the devices like Smartphones, Computers, tablets etc to the internet. We should always make our Wi-Fi connection secured from the accessing of unauthorized users which should be protected by the password.
(3) Write the types of Internet services in brief
Ans :- Some types of internet services are as followed :-
(a) Dial up :- This service clearly states the slowest type of Internet connection and can be used only in the areas where the internet service is needed. Internet cannot be used at the same time when the dial is used along with the phone line termed as telephone line.
(b) DSL :- Nowadays, Broadband connections by the DSL services for the faster speed as compared to Dial up service. DSL also gets connected to the internet with the help of phone line and the phone line and the internet can be used at the same time. Not like the Dial up.
(c) Cable :-
This service is much easier in connecting the Internet with the Cable TV. As comparison is made between the both i.e is Dial up and DSL, cable service makes use of the broad band connection, which is much faster than these both services.
(d) Satellite :- In this type service, broad band connection is used which does not need
any cables or phone lines. In such type of services broad band gets connected to the internet through the man-made satellite which is orbiting the earth. Such connection are widely used around the world but can be affected/disturbed according to the weather or climatic changes. These connections are slower than the DSL or cable.
(3) 3G and 4G :- This service is mostly used in the devices such as mobile phone, tablets etc and gets connected to it with the help of ISP’s network. As the comparison is made between the Cable or DSL and 3G and 4G services, such service’s connection is very slow than Cable or DSL. 3G and 4G services are nowadays popularly used.
(4) What do you mean by Twisted Pair cables, Coaxial cables, Fiber optic cables? Write down their advantages and disadvantages.
Ans:- The different types of cables are Twisted Pair, Coaxial cable and Fiber Optic cables etc are explained below along with their advantages and disadvantages
Twisted Pair Cables :- Shielded and Unshielded are the two types of twisted pair cables which are used for networking. Such type of cable is used for connecting the two network devices (computer, switches etc) directly. Ethernet cable is the perfect example of Twisted Pair cables.
Advantages of Twisted Pair cables
- This cables transfers the data at a very high speed and is much cheaper.
- This cables makes less use of electricity.
- This cable is very simple to use or install.
Disadvantages of Twisted Pair cables
- If incase there is any problem in the cable, so its very complicated to detect the fault/problem of the cable.
- For using this cables (Ethernet), there must be the presence of the Ethernet cable inside the computer.
Coaxial Cables :- The coaxial cable is the central copper wire which is been covered by the outer jacket. It is widely used by the Cable television companies in connecting the Television set with the antenna.
Advantages of Coaxial cables
- This cables are no much costly and carries the data over the long distance more easily.
- This cable has noisy immune due to its thick outer covering.
- Such cables are light in weight, and easy and flexible to work with.
- As compared to the Twisted pair cables, this cables are more cable of interference and attenuation in the terms of loss in the strength of the signal.
Disadvantages of Coaxial cables
- This cables are consisting of copper metal wire which is easily breakable.
- Some of the coaxial cables are so thick, which cannot bend properly /easily and results difficulty in installation and maintainance.
Fiber Optic Cables :- This cable makes use of glass thread (fibers) for data transfer. Each of the glass threads of the cable is much capable of transferring of data (messages) in the form of light waves. As this cable is made up of glass, such cable is bendable.
(5) Name the devices which are required for connecting different devices in a network?
Ans :- The devices which are required for connecting the different devices in a network are as follows :-
(a) Cables :- For connecting the computers and other devices in a networks, the cables such as flexible metal or fibre optic wires are been made use of.
(b) Network Interface Card (NIC) :- You can easily connect the connect the computer to the network as Network Interface Card (NIC) is placed/installed on the mother board inside the system unit. It can be added for each client and server computers. NIC is also known as Printed Circuit Board (PCB). There are two kinds of Network Interface Card (NIC) which are:-
Ethernet Card :- In this type of card, for data transmission ethernet cables and connectors are been made used.
Wireless Card :- In this type of card, use of cables or connectors are not made. Here for the data transmission, the use of antennas is made which creates radio waves technology.
(c) Switches :- HUB is also called as Switch. It is used for connecting many computers in a single network. In the hub, the duplication of packets (data) that is received at one port and is distributed to the other ones. Hence the data is shared within all the connected devices those are connected to the hubs/switches.
(d) Modem :- The full of MoDem is Modulator and Demodulator which is a hardware device. This devices transfers the data from one computer to the another within the computer network. The computer networks work in the digital form whereas modem makes use of the modulation technology for transferring of messages over the phonelines. During the data transferring the modem converts the information from digital to analog mode at the transferring end whereas the Demodulator converts the information from analog mode to the digital mode at the receiving end.
(e) Routers :- It is a device that is used to analyse, receive and forward the data in the network or to the another one (network). In the network whatever the data packets its receiving, Routers are makes a way for the forwarding.
For further update follow net explanations home page
Comments
Post a Comment