Class IX Lesson 10 (Computer Network) English Medium

LONG ANSWER TYPE QUESTIONS

1- What is computer networking and explain its types in detail?

Ans:-Computer networking is the process of connecting multiple computers and devices to share data, resources, and communication. A network allows computers to exchange information using wired or wireless connections.
Components of a Network:

1. Nodes: Devices like computers, printers, and servers.
2. Cables & Wireless Signals: Used for data transmission.
3. Switches & Routers: Help direct network traffic.
4. Network Interface Card (NIC): Connects a device to the network.

Types of Computer Networks:

1. LAN (Local Area Network): Connects devices in a small area like a home or office.
2. WAN (Wide Area Network): Covers large areas, like the internet.
3. MAN (Metropolitan Area Network): Connects networks within a city.
4. PAN (Personal Area Network): Small network around a person, like Bluetooth devices.
5. VPN (Virtual Private Network): Provides secure remote access to a network.
6. Computer networks improve communication, data sharing, and collaboration.

2-What is Computer Network? Describe their types with examples.
Ans:- A computer network is a connection of multiple devices to communicate and share data. Types of networks:

1. LAN (Local Area Network): Covers a small area like an office or home.
2. WAN (Wide Area Network): Covers large areas like cities or countries.
3. MAN (Metropolitan Area Network): Covers a city or large campus.
4. PAN (Personal Area Network): Connects personal devices like phones and laptops.
5. VPN (Virtual Private Network): Securely connects remote users over the internet.

3- What is Network Topology? Describe their different types.
Ans:- Network topology is the arrangement of devices in a network. Types:

1. Bus Topology: All devices share a single cable.
2. Star Topology: Devices connect to a central hub.
3. Ring Topology: Devices form a circular connection.
4. Mesh Topology: Devices are interconnected for redundancy.
5. Tree Topology: A hierarchical structure with multiple branches.

4- Explain Ring and Star topology.
Ans:-  Ring Topology:

1. Computers are connected in a circular path.
2. Data moves in one or both directions.
3. If one computer fails, it may affect the whole network.
4. Used in small office networks.

              Star Topology:

1. All computers connect to a central device (hub or switch).
2. If one computer fails, others continue working.
3. Easy to manage and expand.
4. Used in homes and businesses.

5- What is Star Topology? Describe the advantages & disadvantages.
Ans:- Definition: Star topology is a network setup where all computers and devices connect to a central hub or switch. This hub manages data transfer between devices.
Components of a Star Topology Network:

1. Central Hub/Switch: Main connecting device.
2. Nodes: Computers, printers, or other devices.
3. Cables/Wireless Signals: Used for communication.
4. Network Interface Card (NIC): Connects devices to the network.

Advantages of Star Topology:

1. Easy to manage: Simple to add or remove devices.
2. High performance: Fast communication due to direct connections.
3. Fault tolerance: If one computer fails, others continue working.
4. Secure: Data passes through a central device, making monitoring easier.

Disadvantages of Star Topology:

1. Expensive: Requires cables and a central hub.
2. Central point failure: If the hub fails, the whole network stops working.
3. Limited connections: The hub has a fixed number of ports.

Star topology is widely used in homes, offices, and businesses due to its reliability.

6-Write down the major benefits from the Computer Network.
Ans:- Benefits include:

1. Data Sharing: Files and resources can be easily shared.
2. Communication: Emails and video calls improve teamwork.
3. Resource Sharing: Printers and storage devices can be used by multiple users.
4. Security: Centralized security management.
5. Cost Efficiency: Reduces hardware costs by sharing devices.

7- What is OSI? Explain its different layers.
Ans:- OSI (Open Systems Interconnection) model defines seven layers for communication:

1. Physical Layer: Transmits raw data.
2. Data Link Layer: Detects errors in data.
3. Network Layer: Routes data between networks.
4. Transport Layer: Ensures complete data transfer.
5. Session Layer: Manages sessions between applications.
6. Presentation Layer: Formats and encrypts data.
7. Application Layer: Provides services like email and file transfer.

8-What is wireless communication medium? Explain in brief.
Ans:- A wireless communication medium transmits data without physical cables. Types include:

1. Radio Waves: Used in Wi-Fi and Bluetooth.
2. Microwaves: Used in satellite communications.
3. Infrared: Used in remote controls.
4. Mobile Networks: Used in cellular communication.

9-What are the different components of a computer network?
Ans:- The key components are:

1. Nodes: Devices like computers and printers.
2. Switches: Connect multiple devices within a network.
3. Routers: Direct data between networks.
4. Cables & Wireless Media: Transmit data.
5. Servers: Store and manage data.
6. Network Interface Card (NIC): Enables communication between device. 

SHORT ANSWER TYPE QUESTIONS

1. What is complete Network? Explain its main type.
   Ans:- A complete network is a system where computers and devices are fully connected to share resources. The main type is a fully connected network, where every node has a direct link to others, ensuring fast communication.

2. What is repeater?
   Ans:- A repeater is a networking device that receives a signal, amplifies it, and retransmits it over a longer distance without degradation. It helps extend the range of a network.

3. Explain bridge.
   Ans:- A bridge is a networking device that connects two or more networks and allows communication between them. It filters traffic and reduces network congestion by dividing large networks into smaller segments.

4. What are main functions of repeaters?
   Ans:- The main functions of a repeater are to regenerate weak signals, extend network coverage, and maintain data integrity by reducing signal loss over long distances.

5. Describe the advantages & disadvantages of Computer Network.
   Ans:- Advantages: Easy data sharing, resource sharing, better communication. Disadvantages: Security risks, high setup costs, and potential system failures affecting all connected devices.

6. Which equipments are used in Networking? Explain.
   Ans:- Common networking equipment includes routers, switches, modems, hubs, bridges, and repeaters. These devices help in data transfer, connection management, and signal amplification.

7. Distinguish between LAN & WAN.
   Ans:- LAN covers a small area like an office or home, whereas WAN covers large areas like cities or countries. LAN offers high speed; WAN has slower speeds due to long distances.

8. Write any two advantages of Ring Topology.
   Ans:- (1) Data flows in one direction, reducing collision chances. (2) It performs better under heavy network loads compared to other topologies.

9. Write any two advantages of Star Topology.
   Ans:- (1) Easy to add or remove devices without affecting the network. (2) If one device fails, the rest of the network continues to work normally.

10. What do you mean by WAN?
    Ans:- WAN (Wide Area Network) is a large network that connects multiple LANs across cities, countries, or globally using communication links like satellites or fiber optics.

11. What is Bus Topology? Write any two advantages of Bus Topology.
    Ans:- Bus topology is a network where all devices share a single communication line. Advantages: (1) It is cost-effective and easy to install. (2) Requires less cabling than other topologies.

12. What is gateway?
    Ans:- A gateway is a device that connects different networks using different communication protocols, enabling seamless data exchange between them. It acts as a translator between networks.

VERY SHORT ANSWER TYPE QUESTIONS

1. 1. Define Network?
      Ans:- A network is a system where computers and devices are connected to share data and resources.

   2. What are the main types of network? Write their names.
      Ans:- The main types of networks are LAN (Local Area Network), MAN (Metropolitan Area Network), and WAN (Wide Area Network).

   3. Write any two types of Network Topology.
      Ans:- Star Topology, Ring Topology.

   4. What is the coverage area of WAN?
      Ans:- WAN (Wide Area Network) covers large geographical areas such as cities, countries, or even continents.

   5. What is client?
      Ans:- A client is a computer or device that requests services or resources from a server in a network.

   6. What is the main function of the server?
      Ans:- The main function of a server is to provide data, resources, and services to clients in a network.

   7. Write the full name of MBPS.
      Ans:- Megabits Per Second.

   8. Where are LAN used?
      Ans:- LAN (Local Area Network) is used in offices, schools, homes, and small businesses for local communication and resource sharing.

MULTIPLE CHOICE QUESTIONS

1. Computer network system is used:
   (a) For shared use of resources
   (b) For private data transfer
   (c) For shared use of the database
   (d) Both (a) and (c)
   Ans:- (d) Both (a) and (c)

2. Computer networks are connected to:
   (a) Computers
   (b) Nodes
   (c) Printers
   (d) All of these
   Ans:- (d) All of these

3. Which network system has the least coverage area?
   (a) LAN
   (b) Internet
   (c) MAN
   (d) WAN
   Ans:- (a) LAN

4. In which network topology does the entire network fail if the main computer fails?
   (a) Star
   (b) Tree
   (c) Ring
   (d) Bus
   Ans:- (a) Star

5. The computer connected to the server or central computer of the Network is called:
   (a) Cable
   (b) Node
   (c) Client
   (d) Hub
   Ans:- (c) Client

6. Which network topology is used for satellite communication?
   (a) LAN
   (b) WAN
   (c) MAN
   (d) Ring
   Ans:- (d) Ring

7. The main types of Computer Networks are:
   (a) 2
   (b) 3
   (c) 4
   (d) 5
   Ans:- (b) 3

8. Communication medium used in LAN:
   (a) Telephone line
   (b) Fiber optics
   (c) Satellite
   (d) Microwave circuit
   Ans:- (b) Fiber optics

9. The transmission speed of WAN is:
   (a) 0.1-100MB
   (b) 9600 BPS
   (c) 10,000 BPS
   (d) None of these
   Ans:- (b) 9600 BPS

10. Data transmission speed is fastest in:
    (a) LAN
    (b) WAN
    (c) MAN
    (d) None of these
    Ans:- (a) LAN