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CLASS:- VIII CH-1 LET US EXPLORE COMPUTER NETWORK, A. Answer these following questions., , 1) What is computer network?, Ans. A computer network is a collection of two or more computers connected, together in order to communicate and share the data and information., , 2) Write the Name of all network components which is essential for, network., I., , II., , III., , IV., , V., , NIC:- Network Interface Card is required on each computer. It, connects the computer to the special device called switch, which, in turn links all of the computers on the network together., Switch:- A switch is used to connect multiple devices(such as, computers, printers, scanners, etc) which need to be connected to, each other in a network., Modem:- A modem is a hardware device which means, Modulator-Demodulator. Modems are used for data transfer from, one computer to another computer. It translate data from analog, signal to digital signal., Router:- It is another device most commonly used in Network, which is used to tie or join multiple networks together. The router, will acts as a courier, choosing the best route for your information, to travel so that your receive it quickly., Cables:- It connect the computers and other peripheral devices to, each other., , 3) How many types to make computer Network?, Ans. There are two types to make computer network., , I., II., , Wired Network:- A wired network is a network which used networking, cables to connect devices (ex. Computers, printers, scanners), Wireless Network:- A network without the use of cables to connect the, computers together. In this network use wireless radio signals,, Microwaves signals, satellites to send information from one device to the, other., , 4) What is Wired Network? How many types of network cables?, Ans. Wired network setup which uses physical cables to transfer data between, different devices and computer systems., There are different types of network cables:i. Twisted Pair:- It is used to connect two network devices directly., Advantage:Provide high data transfer speed, Less power consumption., Simple to Install
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Disadvantage: Difficult to troubleshoot, ii. Co-axial Cable:- A co-axial cable consists of a central copper wire, surrounded by an outer jacket. It is mostly used in TV cable Network., Advantage:Carry data over long distance., Excellent Noise immunity, Light and flexible, Disadvantage:Copper conductors can easily break, Do not bend easily, iii. Fiber optic cable:- it uses glass threads (fibers) to transmit data, each of, which is capable of transmitting messages in the form of light waves., Advantage:Easy to install, Very high data transmission speed, Disadvantage:High cost., Can break easily, , 5) How many types of wireless network?, Ans. There are different types of wireless network., i. Bluetooth:- Bluetooth is a wireless technology which uses radio, frequencies to transmit information over short distance approx 10, meters or less., ii. Infrared Waves:- they are used for communication between devices that, are not very far from each other. It uses infrared light to communicate, between two devices., Disadvantage of infrared waves affected by distance, noise and, heat., iii. Radio Waves:- Radio waves are electromagnetic signals that are, transmitted by an antenna. They travel in all the directions from the, source or omni- directional waves. It can travel long distances., Disadvantage of radio waves signals get easily affected by rains,, thunder storms etc., iv. Satellite communication:- it is widely used all over the world, allowing, users to transmit a signal to any part of the earth’s surface.
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v., , Wi-Fi:- it is the most popular wireless communication technology used, within a room or a building for connecting to internet. It uses radio waves, for communicate., , 6) How many types of Network?, Ans. There are different types of Network., i. LAN(Local Area Network):- A local area network is a computer network, covering a small area like a home, office, school or a college., ii. MAN(Metropolitan Area Network):- A metropolitan area network is a, computer network covering a large area like a campus, corporate office, or a city. Ex. ATM service., iii. WAN(Wide Area Network):- A wide area network connects LAN and, MAN together. It covers a large geographical area. This network may be, located throughout a country or a continent or around the world., , 7) What is the function of Modem?, Ans. Function of modem is to convert analog signals into digital signals and viceversa., , B. True or False., i., ii., iii., iv., v., vi., , Switch is a network connecting device. True, Twisted Pair cable is an example of the wireless networking tool. False, The ARPANET launched its first successful long distance communication network., True, The Internet stands for International Network. True, An Internet is a private network owned by a single organization. False, PAN stands for Person Access Network. False, , C. Fill in the blanks., i., ii., iii., iv., v., vi., , ATM is an example of wide Area Network., The internet is the biggest type of network available o the earth., Each computer in a network is called a Node., Wi-Fi is a technology that uses Radio waves to provide network connectivity., The Data transfer range of Bluetooth is 10 meters or less., A Protocol is a set of guidelines that controls the data communication., , D. Match the following., i., ii., iii., iv., v., , Protocol, LAN, Infrared Light, Omni-Direction, Analog to digital, , a. Modem, b. Infrared Waves, c. Guideline, d. Network in office, e. Radio waves
