The document provides an overview of computer networks, including definitions, goals, and various types of networks such as peer-to-peer and client-server. It also discusses key networking devices like hubs, switches, routers, bridges, and gateways, along with their roles and when to use them. Additionally, it explains cloud computing, Internet of Things (IoT), deployment models, and concerns related to data security and privacy.

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2. Q.1.What is a network? What are its goals and applications?
Answer:
Two or more autonomous computing devices connected to one another in order to exchange
information or share resources is called a computer network.
Its goals and applications:
Share resources
share storage
Can share software
Improve communication
Q.2.Discuss and compare various types of networks?
Answer:
Peer to peer network-
Each computer on a peer-peer network is equal. Each computer can play the role of a client
and server.
Client-server network-
There is a computer reserved for the server’s job and its only job is to help workstations
access data, software and hardware resources.
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3. Q.3.What are hubs ? what are its types?
Answer:
Hardware device used to connect several computers together.
Types of hub-
a)Active hubs- also connect plus repeat the signal
b)Passive hubs- signal is passed from one computer to another.
Q.4.What is the role of a switch in a networks?
Answer:
Device used to segment networks into different subnetworks called subnets.
Q.5. Briefly discuss the role of following devices in the context of networking?
(i)Router
Answer:
Device that works like a bridge but can handle different protocols.
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4. (ii)Bridge
Answer:
Device that links two networks together.
(iii)Gateway
Answer:
Device that connects dissimilar networks.
Q6. When would you prefer
(i) bridges over hubs
(ii) switch over other network devices?
Answer :
(i) We would prefer bridges over hubs when we need to connect multiple networks.
(ii) We would prefer switch over others network devices when want to segment networks
into different sub-networks to prevent traffic overloading.
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5. Q7. When would you opt for a router in a network?
Answer:
When we want to connect different network of different protocol.
Q.8.What are hubs? How are active hubs different from passive hubs?
Answer:
Hardware device used to connect several computers together.
Types of hub-
a)Active hubs- also connect plus repeat the signal
b)Passive hubs- signal is passed from one computer to another.
Q.9.What are the facilities provided by the SERVER in a Network environment?
Answer:
A server facilitates networking tasks like sharing of data, resource-sharing, communication
among hosts etc.
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6. Q.10.In which network there is no server?
Answer:
Peer – to – Peer network
Q.11.What is a cloud? What is cloud computing?
Answer :
Cloud: – The Cloud is a generic term used for internet.
Cloud computing: – Cloud computing is Internet-based computing, whereby shared
resources, software, and information are provided to computers and other devices on
demand, like the electricity grid.
Q.12.What are different cloud deployment models?
Answer:
a)Private cloud
b)Public cloud
c)Community clouds
d)Hybrid clouds
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7. Q.13.How is a public cloud different from a private cloud?
Answer:
Public Clouds: –These are the clouds for use by multiple organizations (tenants) on a
shared basis and hosted and managed by a third party.
Private Clouds: –
These are the clouds for exclusive use by a single organization and typically controlled
managed and hosted in private data centers.
Q.14.What is internet of things?
Answer:
loT is a phenomenon that connects the things (the smart devices) to the Internet over wired
or wireless connections.
Q.15.What are the technologies that have enabled IoT?
Answer:
The technologies that have enabled IoT are as follows:-
1. RFID (Radio Frequency Identification)
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8. 2. Sensors
3. Network connectivity
4. Smart technologies
Q.16.What are the concerns related to IoT ?
Answer:
Data security and privacy are major concerns related to IoT. These devices are vulnerable to
hacking and cloud endpoints could be used by hackers to attack servers.
Thanks, for read of Computer Network CBSE class 12 assignment solution.
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