In today’s Internet, world Networking plays an important role in the various successes of the organization, creating a network environment and device connectivity.


Because there are many devices that help you connect your computer to another computer, such as a router, hub, switch, and more.


The network is divided into two types: a wired network in which computers are connected by cables and a wireless network without using cables.


Before switching to a computer network, there are certain conditions on which you should know how to use NIC or a network card, LAN or local area network, servers, hub or switch and others.



 Computer Network Types and Categories

such as star and ring topology, which show the geometric layout of the computer system, the protocols for LAN known as Ethernet used for data transmission, and the last network architecture in the peer to peer and client/server model.



 Computer Network

A computer network is a combination of two or more computers via a medium of information exchange or data transmission.

These computer devices can be PCs, workstations, mainframes connected to printers, modems, CD / DVD ROM drives, and other peripherals to share resources over the network.



Computer connections over the network are possible via several network devices, such as routers, bridges, gates, cables, satellites, and more.


The Internet is the best example of a computer network that helps in exchanging data between two or more computers on the network.


However, the main function of the Computer Network program is to provide a medium to connect and connect with various computer devices for easy data communication.


Computer networks are very useful in many ways to communicate over the network via email or chat, share hardware resources for printing or scanning documents, share files and data on a storage device, share applications and run remotely on other computers, and more.



Local Network

 It is a computer network that covers a small geographical area, such as an office building, school, universities, etc. Where a wired or wireless LAN is used to connect devices such as personal computers, printers to the Internet.



The wired connection can be implemented using cables such as twisted-pair cable, coaxial cable or fiber optic cable for data transmission speed.


Similarly, a wireless LAN is implemented using radio wave technology or infrared communication that helps connect multiple devices within an area. Ethernet or IEEE 802.11LAN is used to connect the device to a router or modem for fast data transfer.


The five main LAN components are network devices, such as workstations, printers, servers that other computers can access, network communication devices such as a router, hub, and switches to connect to, a network card or network card, cables as a medium and system network.



WAN or Wide Area Network

It is a type of computer network that helps connect computers located in other countries or cities via telephone lines, radio waves or other communication links.

what is computer network


MAN or Metropolitan Area Network:

The metropolitan area network is designed to be used in the city or in the city via a wireless medium or fiber optic cables.

Provides connectivity for LANs and connects them to the WAN to share the connection over the Internet. The size of the MAN network is between LAN and WAN, which initially range from 5 to 50 km.



Home Network

The network is connected to a user’s home that connects different digital devices on the network to communicate with other devices. Characteristics of computer network resources.


Sharing resources from one computer to another computer in the network. Efficiency by measuring the data transmission speed with the number of users, communication, and software used.


Reliability facilitates the use of an alternative source of communication in the event of hardware failure or connectivity. Scalability increases system performance by adding more Processors Security is the main feature of a computer network in which you can take the necessary steps to protect your data from unauthorized access.


Category: Basic computer information Computer tags: CAN, CAN or Campus Area network, Computer network characteristics, computer networks, HAN networks, HAN or home network, LAN, LAN or local network, MAN, MAN or Metropolitan Area Network, WAN, WAN or Wide Area Network,



Question Answer


1) what is the computer network?

computer network is a group of computers connects together for the purpose of sharing resources. The ordinary resource shared today is a connection to the Internet.



 2)What is the OSI reference model?

Ans: Open System Interconnection, the name itself suggests that it is a reference model that defines how applications can communicate with each other through a network system.

It also helps to understand the relationship between networks and defines the communication process in the network.



3)What are the layers in the OSI reference models?

Describe each layer briefly. A: The following are seven layers of OSI reference models: # 1) Physical layer (layer 1): the physical layer converts data bits into electrical impulses or radio signals. E.g. Ethernet. # 2) The data link layer also detects errors in layer 1.


# 3) Network layer (layer 3): The network layer sends a variable-length data sequence from one node to another node in the same network. # 4) Transport Layer (Layer 4): transmits data between nodes and also provides confirmation of successful data transmission. Tracks uploads and resends segments if the transmission fails.



4)What is HTTP?

Ans: HTTP is a HyperText Transfer Protocol and is responsible for web content. Many websites use the HTTP protocol to transmit web content and allow display and navigation of HyperText. This is the main protocol, and the port used in this case is TCP port 80.



5) What is HTTPs?

A: HTTPS is a secure HTTP protocol. HTTPS provides web page authentication, which prevents unwanted attacks. In bi-directional communication, the HTTPS protocol encrypts communication, thus avoiding data manipulation.


Using the SSL certificate, it checks whether the requested connection to the server is a valid connection or not. HTTPS uses TCP with port 443.



6)What happens after entering the URL in a web browser?

The URL may contain an HTML request, an image file or any other type. If the content of the URL you entered is in the cache and is fresh, display the content.


Find the IP address for the domain so that you can configure the TCP connection. The browser performs DNS lookup. The browser needs to know the IP address for the URL so that it can configure the TCP connection. That’s why the browser needs DNS.




The browser first looks for the URL-Cache cache and then the operating system cache. If all caches are empty, it creates a recursive query to the local DNS server. The local DNS server provides an IP address.


The browser sets the TCP connection using a three-way handshake. The browser sends an HTTP request. The server has a web server such as Apache, IIS that supports incoming HTTP requests and sends an HTTP response.



The browser receives an HTTP response and renders the content. What is DHCP, how does it work? The idea behind Dynamic Host Configuration Protocol (DHCP) is to allow devices to obtain an IP address without manual configuration. The device sends a broadcast message “I am new here”.


The DHCP server sees the message and responds back to the device and usually assigns an IP address. All other devices on the network ignore the message about the new device because they are not DHCP servers. In Wi-Fi networks, access points generally operate as a DHCP server.



7)What is the ARP, how does it work?

ARP stands for Address Resolution Protocol. The node usually has a destination IP address to send the packet, the nodes need a link-layer address to send the frame over the local link.


The ARP protocol helps here. The node sends a broadcast message to all nodes, informing what the MAC address of this IP address is. The node with the provided IP address corresponds to the MAC address.



Easy definitions of computer Network

1) There are many types of computer networks, including Local Area Networks (LANs): Computers are geographically close (in the same building).


2)A network can refer to any of the following: 1. A network is a collection of computers, servers, mainframes, network devices, peripherals or other devices connected to each other to enable data sharing.

An excellent example of the network is the Internet, which connects millions of people around the world


3)A network consists of two or more computers connected to share resources and communication. Two very popular types of networks include Local Area Network (LAN) Wide Area Network (WAN).