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II PUC Computer
In this Chapter
Introduction to Computer
Networks
Evolution of Networking
Types of Networks
Network Devices
Networking Topologies
Identifying Nodes in a Networked Communication
Internet, Web and the Internet of Things
Domain Name System
C h a pt e r "Hoaxes use weaknesses in human behavior to ensure they are replicated and distributed. In other words, hoaxes prey on the Human Operating System." - Stewart Kirkpatrick10.1 INTRODUCTION TO COMPUTER NETWORKS
We are living in a connected world. Information
is being produced, exchanged, and traced across the globe in real time. It's possible as almost everyone and everything in the digital world is interconnected through one way or the other. Figure 10.1: Interconnection forming a social networkComputer Networks
10Chpater-10.indd 18111-09-2020 16:41:16
COMPUTER SCIENCE - CLASS XIICOMPUTER NETWORKS
182A group of two or more similar things or people
interconnected with each other is called network (Figure10.1). Some of the examples of network in our everyday
life includes:Social network
Mobile network
Network of computers
Airlines, railway, banks, hospitals networks
A computer network (Figure 10.2) is an interconnection among two or more computers or computing devices. Such interconnection allows computers to share data and resources among each other. A basic network may connect a few computers placed in a room.The network size may vary from small to large
depending on the number of computers it connects.A computer network can include different types of
hosts (also called nodes) like server, desktop, laptop, cellular phones.Figure 10.2: A computer network
Apart from computers, networks include networking
devices like switch, router, modem, etc. Networking devices are used to connect multiple computers in different settings. For communication, data in a network is divided into smaller chunks called packets. These packets are then carried over a network. Devices in a network can be connected either through wired media like cables or wireless media like air.In a communication network, each device that is a
part of a network and that can receive, create, store or send data to different network routes is called a node. In the context of data communication, a node can be a device such as a modem, hub, bridge, switch, router, digital telephone handset, a printer, a computer or a server.Activity 10.1
Identify some other
networks in the real world.Chpater-10.indd 18211-09-2020 16:41:17
COMPUTER SCIENCE - CLASS XIICOMPUTER NETWORKS
183Interconnectivity of computing devices in a network allows us to exchange information simultaneously with many parties through email, websites, audio/video calls, etc. Network allows sharing of resources. For example, a printer can be made available to multiple computers through a network; a networked storage can be accessed by multiple computers. People often connect their devices through hotspot, thus forming a small personal network.