Here is class 12 computer science Unit 11 solutions for Sumita Arora back exercise assignment. Below includes both textual and video solutions wherever required. View all the answers in assignment for chapter 11 and for all chapters here.Watch all tutorials for chapter 11.
A network is connection of two or more computers through a communication line(cables, wire, wireless) in purpose to share information and resources.
For example : if multiple computers are connected through a printer than each computer can access the printer.
1. Resource sharing make sure the availability of the to each node.
2. High reliability ensures alternate source of supply.
3. Saving money is the another advantage of the network.
4. It also leads the increase in the performance and efficiency of system.
Access of the data to remote programs.
Access to remote databases everywhere.
Value-added communication facilities and enhancement.
A network can refer from a few numbers of system to a few hundred number of system that depends on type of network.
A hub is a hardware device that used to connect several network together to a single chain. Hubs are devices commonly used to connect segments of a LAN. Such as when a packet arrives at one port, the hub copy to the other ports so that all segments of the LAN can see all packets.
A switch is a hardware device that is used to segment the networks into different subnetwork called subnets or LAN segments.
It is a better approach to avoid traffic over a single network and also help in filtering the backward and forward packet transmission.
Bridge is a device that connects and passes packets between two network segments that use the same communications’ protocol. In this bridge know which side having which system and hence communicate according to that.
Router: It acts similar like bridge that act as communicator within segments of network. It enhances and improve the reliability of network. It can also handle multiple protocol advanced over the bridge.
Gateway: It is a hardware device that connects dissimilar networks to form a single channel. It establishes an intelligent network between the LAN and external network.
(i) We would prefer bridges over hubs when we need to connect multiple networks to single active one.
(ii) We would prefer switch over others network devices when we want to segment networks into different subnetworks to prevent traffic overloading.
We would opt for a router in a network when we want to connect different network of different protocol. For example, a router can link Ethernet to a mainframe.
Active hubs electrically amplify the signal as it moves from the one connected part to another whereas Passive hubs just pass the signal from one connected part to other without any changes.
A server is a computer used in a network and which provides a service to a client. Servers usually have more processing power, memory and storage than client computers. It provides a central unit for storages and commanding unit.
In a peer-to-peer network, there are no dedicated servers and there is no any such hierarchy. In this network there is no client and the server relationship exist.
Cloud computing is Internet-based computing, whereby shared resources, software and information are provided to computers and other device on demand.This computing is delivered through a network usually the internet.
The Internet of Things (IoT) is a network of ‘smart’ devices that connect and communicate via the Internet. The key to the IoT is the interconnectivity of devices, which collect and exchange information through embedded software, cameras and sensors.
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