Class 8 Chapter Introduction to Data Communication and Network

 Class 8 

Chapter Introduction to Data Communication and Network

Write very short answer of the following questions: 

a. Is half duplex one way communication? 

Ans: Yes, half duplex is one way communication. 

b. Which was the first computer network of the world? 

Ans: The first computer network in the world is considered to be the ARPANET (Advanced Research Projects Agency Network).

c. Which network device joins multiple computers together? 

Ans: A network switch is a device that joins multiple computers together in a local area network (LAN).

d. Which is the fastest media in which data are transmitted according to the speed of light? 

Ans: Optical fiber, utilizing light signals, provides the fastest data transmission medium approaching the speed of light.

e. Which network topology places hub at the center? 

Ans: The network topology that places a hub at the center is typically the "Star" topology.

f. Which topology is considered as hybrid topology? 

Ans: Mesh topology is considered as hybrid topology.

g. Is email faster and cheaper than postal mail? 

Ans: Yes, email is faster and cheaper than postal mail.

h. Write any two popular search engine. 

Ans: google and bing  are two popular search engine.

Write short answer of the following questions: 

a. Write any two advantages of computer network. 

Ans: Any two advantages of computer network are:

• Data and information can be shared.
• Data processing is economic and faster. 

b. What is meant by network topology? 

Ans: Network topology is the interconnection pattern of computers in the network. It is the physical layout of the terminals, links and computers in the network.

c. List any four common topologies.

Ans: Any four common topologies are:

1. Bus topology 
2. Star topology
3. Ring topology
4. Mesh topology 

d. Draw and explain about bus topology. 

Ans: Bush topology is a type of network topology in which, all the computers are connected to a common cable called bus or trunk. This is simple and easy to install but if the common cable breaks it effect the whole network.

e. Differentiate between star and ring topology.

Ans:  

Star topology.	ring topology.
1. Star topology connects devices to a central hub	1. ring topology links devices in a circular chain.
2. Star topology is easy to set up and manage, suitable for small to medium-sized networks.	2.  Ring topology is less common due to complexity, but it can be more resilient as data travels through multiple devices.
3. If the hub fails, the whole network can be affected.	3. Failure of any single device can disrupt the entire network.

f. List its any four services of internet. & What is web browser? 

g. Name any two common browser software. 

Ans: Any two common browser software are : Google Chrome and Mozilla Firefox.

h. What is ISP? List any two popular ISPs of Nepal. 

Ans: ISP stands for Internet Service Provider. It's a company that provides internet service to users. Nepal Telecommunication (NTC) and World link are the two popular ISPs of Nepal.

i. List the components of data communication.

Ans: The components of data communication are:

1. Message

2. Sender

3. Receiver

4. Medium or communication Channel

5. Encoder and Decoder

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