Concept about Computer Network – This book covers the entire syllabus of “Computer & Information Technology” prescribed by the BNMC for B.Sc. in Nursing Science & Diploma in Nursing Science & Midwifery students. We tried to accommodate the latest information and topics.
This book is an examination setup according to the teachers’ lectures and examination questions. We hope in touch with the book students’ knowledge will be upgraded and flourished. The unique way of presentation may make your reading of the book a pleasurable experience.
Concept about Computer Network
A computer network or data network is a telecommunications network which allows nodes to share resources. In computer networks, networked computing devices exchange data with each other using a data link. The connections between nodes are established using either cable media or wireless media.
Network computer devices that originate, route and terminate the data are called network nodes. Nodes can include hosts such as personal computers, phones, servers as well as networking hardware. Two such devices can be said to be networked together when one device is able to exchange information with the other device, whether or not they have a direct connection to each other. In most cases, application-specific communications protocols are layered (i.e. carried as payload) over other more general communications protocols. This formidable collection of information technology requires skilled network management to keep it all running reliably.
Computer networks support an enormous number of applications and services such as access to the World Wide Web, digital video, digital audio, shared use of application and storage servers, printers, and fax machines, and use of email and instant messaging applications as well as many others. Computer networks differ in the transmission medium used to carry their signals, communications protocols to organize network traffic, the network’s size, topology and organizational intent. The best-known computer network is the Internet.
Definition of Computer Network:
Computer network is defined as a group of computers connected by communication facilities for sharing resources.
Or
A computer network is a group of computer systems and other computing hardware devices that are linked together through communication channels to facilitate communication and resource sharing among a wide range of users.
Uses of Computer Network:
- Facilitate communication via email, video conferencing, instant messaging, etc.
- Enable multiple users to share a single hardware device like a printer or scanner
- Enable file sharing across the network
- Allow for the sharing of software or operating programs on remote systems
- Online communication
- Software sharing
- Product promotion
- Customer support service
- Online shopping
- Make information easier to access and maintain among network users
Advantages/Benefits of Computer Network:
- It enhances communication and availability of information.
- It allows for more convenient resource sharing.
- It makes file sharing easier.
- It is highly flexible.
- It is an inexpensive system.
- It increases cost efficiency.
- It boosts storage capacity.
Disadvantages of Computer Network:
- It lacks independence.
- It poses security difficulties.
- It lacks robustness.
- It allows for more presence of computer viruses and malware.
- Its light policing usage promotes negative acts.
- It requires an efficient handler.
- It requires an expensive set-up.
Characteristics of Computer Network
- Sharing Resources from one Computer to another Computer over a network
- Performance by measuring the speed of data transmission with number of users, connectivity and the software used
- Reliability makes easy to use an alternative source for data communication in case of hardware failure or connectivity issues
- Scalability increases the system performance by adding more processors
- Security is the main characteristics of Computer network where you can take necessary steps for protecting your data from unauthorized access
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