E.
Answer the following questions.
1. What is networking? State its advantages and disadvantages.
2. What are the different components of a computer network? Explain them briefly
.
3. What is a topology? Explain the different types of topologies used in computer
networks.
4. What is Mobile OS? Give few examples.
5. Give two reasons for developing a mobile app.
Answers
Answer:
1.Networking, also known as computer networking, is the practice of transporting and exchanging data between nodes over a shared medium in an information system.
Advantages:File sharing - you can easily share data between different users, or access it remotely if you keep it on other connected devices.
Resource sharing - using network-connected peripheral devices like printers, scanners and copiers, or sharing software between multiple users, saves money.
Disadvantages:
Purchasing the network cabling and file servers can be expensive.
Managing a large network is complicated, requires training and a network manager usually needs to be employed.
If the file server breaks down the files on the file server become inaccessible.
2.Physical Connections
- The physical components are the network topology and network connecting devices, which include network interface cards (NIC), cabling, connections, and all other hardware to connect the computers.
- Network Operating System
- In order to communicate on a network, computers must use the appropriate operating protocol selected for the network. This protocol enables the computer to exchange information and ensure correct data transmission. The network operating system (NOS) is the controlling software that enables a server to accommodate multiple clients and provide the communication network between them.
- Application Component
- The value of networking lies in the capability of sharing up-to-date information, software and hardware resources with other users on the system.
3.Geometric representation of how the computers are connected to each other is known as topology. There are five types of topology – Mesh, Star, Bus, Ring and Hybrid.
1.Mesh Topology
In mesh topology each device is connected to every other device on the network through a dedicated point-to-point link. When we say dedicated it means that the link only carries data for the two connected devices only. Lets say we have n devices in the network then each device must be connected with (n-1) devices of the network. Number of links in a mesh topology of n devices would be n(n-1)/2.
2.Star Topology
In star topology each device in the network is connected to a central device called hub. Unlike Mesh topology, star topology doesn’t allow direct communication between devices, a device must have to communicate through hub. If one device wants to send data to other device, it has to first send the data to hub and then the hub transmit that data to the designated device.
3.Bus Topology
In bus topology there is a main cable and all the devices are connected to this main cable through drop lines. There is a device called tap that connects the drop line to the main cable. Since all the data is transmitted over the main cable, there is a limit of drop lines and the distance a main cable can have.
4.Hybrid Topology
A combination of two or more topology is known as hybrid topology. For example a combination of star and mesh topology is known as hybrid topology.
4.A mobile operating system (mobile OS) is an OS built exclusively for a mobile device, such as a smartphone, personal digital assistant (PDA), tablet or other embedded mobile OS. Popular mobile operating systems are Android, Symbian, iOS, BlackBerry OS and Windows Mobile.
5.
- The World has Gone Mobile
2. Mobile Apps Offer On-The-Go Marketing
3. Better Service and Sales