Computer Science
Class-VII
Chapter-2 Network and Communication
A. Tick the correct answer.
1. A computer network enables two or more computers to share_____ and resources.
a. data b. information c. memory d. option
Answer: data
2. Networking of computers is a basic need of today's:
a. era b. world c. day d. children
Answer: world
3. One of the advantages of computer networks is:
a. internet b. accuracy c. speed d. service
Answer: speed
4. Computer networks save a lot of ______ for any organizations in different ways.
a. energy b. time c. money d. cost
Answer: cost
5. One of the major drawbacks of computer networks is the _____ issues.
a. electricity b. password c. time d. security
Answer: security
6. Resource sharing is another important benefit of a ____ network.
a. area b. mobile c. computer d. bluetooth
Answer: computer
7. A server is the ______ that controls functioning of other computers.
a. protector b. administrator c. manager d. client
Answer: administrator
8. A network interface card more commonly referred to as a:
a. NIC b. LAN c. GUI d. ALU
Answer: NIC
9. It is difficult to make the _______ secure from hackers, movices or industrial espionage.
a. system b. network c. viruses d. data
Answer: system
10. In _____ two or more computers and peripheral devices are connected within a small are.
a. MAN b. WAN c. LAN d. NIC
Answer: LAN
B. Fill in the blanks:
1. A computer network enables two or more computers to ____ and resources.
Answer: Share data
2. Virus can spread to other computers throughout a computer______.
Answer: Network
3. ________ is a central connection point in a network.
Answer: HUB
4. Microwave is the most commonly used _______ medium.
Answer: Wireless transmission
5. Infrared is one of the most______ forms of wireless communication.
Answer: Primitive
6. Star topology is used in ______ and offices.
Answer: Home
7. _______ is a computer that manages the storage and retrieval of files.
Answer: Server
8. ______ is the kind of copper cable.
Answer: Coaxial cable
9. Network interface card is also knowns as ________.
Answer: NIC
10. Wired transmission channels help in transmission of ____ over a wire based networking.
Answer: Data
C. Write T for true and F for false:
1. Computer also raises the standard of the organization.
Answer: T
2. A hacker can get unauthorized access by using different tools.
Answer: T
3. Resource sharing is another important benefit of a computer network.
Answer: T
4. NIC is a circuit board that regulates exchange of data between the network and computers.
Answer: T
5. A network is a group of two or more computer systems linked together.
Answer: T
6. The best example of MAN is client server.
Answer: F
7. Network clients make request to a server by sending messages.
Answer: T
8. Star topology is mostly used in Local Area Networks.
Answer: T
9. The data transmission speed is fast in LAN than WAN.
Answer: F
10. Coaxial cable is one of the most expensive and the least commonly used wire based networking.
Answer: F
D. Answer the following questions:
1. What is computer network?
Answer: When two or more computers are connected to each other is called computer network.
2. What are the advantages of computer network?
Answer: Advantages of computer network:
* Speed
* Cost effective
* Security concerns
* Resource sharing
3. What is LAN?
Answer: In LAN(Local Area Network) two or more computers are connected within a small area, as in a room, office etc.
4. What is Network Interface Card?
Answer: The NIC is a circuit board that regulates exchange of data between the network and computers.
5. Write the advantage of Peer to Peer architecture.
Answer: Advantage of peer to peer architecture:
There is no need for full time system administrator. Every user is the administrator of his machine.
6. Define coaxial cable.
Answer: Coaxial cable is the kind of copper cable. It is one of the cheapest and the most commonly used wire baed networking.
7. What is infrared?
Answer: Infrared is one of the most primitive forms of wireless communication. It is suitable for short distance. For example- TV Remote.
8. What is networking? Give two advantages.
Answer: A computer network enablestwo or morecomputers to share dataand resources such as printers, exchange files etc.
* Speed
* Cost effective
9. What are the disadvantages of connecting computer in a network?
Answer:
* The main disadvantage of networks is that users become dependent upon them.
* It is difficult to make the system secure from hackers, movies etc.
10. What are the different components of a computer network? Explain them briefly.
Answer:
* Client: Any computer that is the part of a common network is called as client.
* Server: A server is just like any other computer of the network. This is the administrator that controls functioning of other computers.
*Workstation
* Network interface card
* Transmission channels
11. What is topology? Give an example.
Answer: The physical arrangement of the cables, computers and other peripheral devices to form a network is known as a topology.
* Bus topology
* Star topology
* Ring topology
12. Describe the different types of topologies for a computer network.
Answer: Different types of topologies are:
* Bus topology: Bus topology refers to a single cable that connects all the computers.
* Star topology: In this topology computers connect to a central device.
* Ring topology: In ring topology all the nodes are connected to one another in such a way that they make a closed loop.
13. Describe peer to peer architecture.
Answer: Peer to peer architectureis a commonly used computer networking architecture in which each workstation, or node has the same capabilities.
14. What is a server? Explain with an example.
Answer: Server: A server is just like any other computer of the network. This is the administrator that controls functioning of other computers.
15. Where do we use Ring Tolopology? Explain with an example.
Answer: In ring topology all the nodes are connected to one another in such a way that they make a closed loop. Data travels around the network, in same direction either clockwise or anti-clickwise.
E. Write the full forms of the following:
1. WAN 2. MAN 3. TCP 4. HTTP 5. SMTP 6. FTP 7. NIC 8. IP 9. LAN 10. Wi-Fi
Answer:
1. WAN: Wide Area Network
2. MAN: Metropolitan Area Network
3. TCP: Transmission Control Protocol
4. HTTP: Hyper Text Transfer Protocol
5. SMTP: Simple Mail Transfer Protocol
6. FTP: File Transfer Protocol
7. NIC: Network Interface Card
8. IP: Internet Protocol
9. LAN: Local Area Network
10. Wi-Fi: Wireless Fidelity
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