What is Computer Network?

A network is a group of computers to share information, resources and exchange files. In computer network each computer is called a node. A computer, printers or any other devices connected in a network is also called a node.

Types of Computer Network:

1. LAN

2. MAN

3. WAN

4. PAN

1. LAN: 

LAN stands for Local Area Network. It is used for small area like a office, single building etc.

2. MAN: 

It stands for Metropolitan Area Network.This network is used for connect two cities. It is larger than LAN.

3. WAN: 

It stands for Wide Area Network. This network is used for wide area. It is used to connect different countries.

4. PAN: 

It stands for Personal Area Network. It is used for small area like a single room or house.In this network we can connect our laptop with our mobile via hotspot or Bluetooth. 

Need of Network:

1. Data and Information sharing: In a computer network, computer can access information that stored on the other computers in a network. For example, in a university students database is stored on a server. An authorized person can access this data by connecting to the network.

2. Hardware: In network environment, every computer in a network can use hardware that is providing for each user. For example, if we connect our personal computer and printer to network then other user can access our printer over the network.

3. Software Sharing: Recently used software is stored on the hard disk of server so that other users on the network can access the software.

4. Communication: By using network people can communicate efficiently and easily. It is a time and cost saving way to communicate with each other.

Distributed System:Distributed system consist of multiple computers that communicate via computer network. In computer network, computer interacts with each other to achieve a common goal.

Advantages of distributed system:

1.     Modularity

2.     Local control of local data

3.     Better response time

4.     Ability to share data

5.     Direct user interaction

6.     Greater reliability

Network Criteria:

1. Performance: The performance of a network can be measured in different ways, including response time, number of users, transmission medium and hardware.

2. Reliability: Reliability of network can be measured by frequency of failure, the time it takes a link to recover failure.

3. Security: Network security means protecting data from unauthorized access by unknown person.

Network Applications:

1.Electronic Mail: E-mail or electronic mail is used for sending and receiving mails. Email allows a person or group of persons to communicate via internet. It is simple and easy way to communicate.

2.Video Conferencing: It is a face-to-face communication system. Two persons at different places can communicate with each other using video conferencing using a network.

3.Electronic Data Interchange: EDI means transmission of information between companies. It is used to send document electronically from one computer to another computer.

4.Electronic Funds Transfer: EFT is used to fund transfer electronically. It is a safe and secure fund transfer.

5. Facsimile: It is also known as FAX. It is used to send a document.

Advantages of Networks:

1. Resource Sharing: The main aim of network is to make all data available to everyone on the network.

2. High Reliability: Computer network goal is to provide reliability. It provides safe and secure transactions.

3. Saving Money: It saves our money. Using network we can communicate with each other at different places. We can send a message to other person within a second.

4. Scalability: The network has the ability to increase the performance.

5. Communication Medium: It provides a powerful communication medium among users.

6. Increased productivity: It increase productivity as many people can enter data at the same time from different places.

Some other links:

What is C language(elements, features, data types):

Decision making statement:

Statements-Return,exit, break, continue:

Array in C programming:

Constants and keywords in C language:

Declaration Initialization of one dimensional array:

One dimensional array(traversal and searching):

One dimensional array( Insertion and deletion):

Sorting arrays-Insertion sort:

Sorting arrays-Bubble and quick sort:

C programs(Addition of two number):

Switch case statement in C:

Loops in C (for, while, do-while):

C Programming(prime or not, Fibonacci series):

C programs(Factorial, even, triangle,pyramid):

C Programs using string and matrix:

C Programs using while loop and array: