L2 Computer Network & Topology / Class 8 Computer

                                                                          Class 8^th

Subject : Computer Science

L-2 Computer Network & Topology

A) Draw and label the components of Data Communication

• Sender – The device which sends the message (example: computer).
• Message – The data being transferred.
• Medium – The path through which the message is sent (example: cables, air).
• Receiver – The device that receives the message.
• Protocol – Rules that define how data is transmitted

B) Draw and label type of network architecture

There are two types of architectures:

1) Peer-to-peer

• All computers are equal.
• Each can act as a client and a server.

2) Client Server

• One server and multiple client computers.

C) Draw and label types of Network

There are 4 types of networks:

1) LAN

2) MAN

3) WAN

4) PAN

1. LAN (Local Area Network) – Covers a small area like a school or office.

2. MAN (Metropolitan Area Network) – Covers a city or large campus.

3. WAN (Wide Area Network) – Covers a large area such as a country or the world (like the internet).

4. PAN (Personal Area Network) – Covers a very small area around a person (e.g., Bluetooth).

D) Draw and label types of Network Topologies:

Types of topologies are:

1) Bus

2) Star

3) Ring

4) Hybrid

5) FDDI

1. Bus Topology – Single cable connects all computers in a line.
2. Star Topology – All computers are connected to a central hub.
3. Ring Topology – Computers are connected in a circular way.
4. Hybrid Topology – Combination of two or more topologies.
5. FDDI – Uses two rings with fiber optics for high-speed data transmission.

Book Exercise

A) Fill in the blanks

1) Full form of LAN is _________________

a) Local Area Network

b) Large Area Network

c) Limited Access Network

d) Line Area Network

Ans: a) Local Area Network

2) In this network topology single cable connect all computers_________________

a) Star

b) Hybrid

c) Ring

d) Bus

Ans: d) Bus

3) Computers that provide shared single resources to the network users _________________

a) Clients

b) Servers

c) Multiplexer

d) None of these

Ans: b) Servers

4) The way the computers are connected to each other 

a) Star

b) Hybrid

c) Ring

d) Bus

Ans: d) Bus

5) Full form of SAN is _________________

a) System Area Network

b) Single Area Network

c) Storage Area Network

d) None of these

Ans: c) Storage Area Network

B) Guess My Name:

1) Broadband ISDN (B-ISDN)                                                WAN Technology/ LAN Technology

Ans: WAN Technology

2) Computer that access shared network resources, data provided by the server.      Client/ Servers

Ans: Client

3) Network uses fiber optic with a duel counter rotating ring topology.                  PAN/ FDDI

Ans: FDDI

4) Videsh Sanchar Nigam Limited.                                                                         VAN/ PAN

Ans: VAN ( Value Added network)

5) I am the combination of all topologies.                                                            Ring/ Hybrid

Ans: Hybrid

C) Long answer type questions:

1) What are the uses of Computer Network? Explain.
Ans: Computer networks allow sharing of files, resources (like printers), and internet connections. They help in communication through emails, chats, and video calls. They are used in schools, offices, and industries to make work efficient and faster.

2) Explain the various topologies of Computer Network.
Ans: Various topologies of computer network :

• Bus Topology: All devices are connected to a single cable.
• Star Topology: All devices are connected to a central hub.
• Ring Topology: Devices are connected in a circle.
• Hybrid Topology: Combines two or more topologies.
• FDDI: Uses dual ring topology with fiber optics for high-speed data transfer.

3) Explain the sender, Receiver and medium.
Ans: Sender: The device that sends the data (e.g., a computer).

Receiver: The device that receives the data.

Medium: The path through which data travels, such as wires or wireless signals.

 

4) Define the various Communication Interface Devices.
Ans: 

• Modem: Converts digital signals to analog and vice versa.

• Router: Forwards data between different networks.

• Switch: Connects multiple devices in a network.

• Hub: Basic device for connecting multiple computers.

5) What is the difference between LAN and WAN

Ans: LAN (Local Area Network): Covers a small area like a home, school, or office.

WAN (Wide Area Network): Covers a large area like cities or countries (example: Internet)