Internet and Networking Basics: You Must Know in 2026

A modem helps connect a local network to an Internet service. It converts data into a form that can be transmitted through the communication system.
Example: A modem can be used with a broadband Internet connection.

A gateway connects different networks or systems and allows them to communicate with each other.
Example: A gateway can connect a local network to another network.

A server is a computer or system that provides data, applications, or services to other devices.
Example: A web server stores website files and sends them to users when they open a website.

A network device is a hardware device that helps send, receive, forward, or manage data on a network.
Examples: Router, switch, modem, gateway, and server.

The Internet is a large global network that connects computers, servers, mobile devices, and other networks. It allows devices to communicate and exchange information.

Computer networking is the process of connecting two or more computing devices so they can communicate and share data or resources.

The Internet sends information in small units called packets. These packets travel through networks and different devices such as routers and switches until they reach their destination.
The receiving device puts the packets together to form the original information.

The common types of computer networks include:
LAN
MAN
WAN
PAN
These networks are mainly classified according to their size, coverage area, and purpose.

LAN stands for Local Area Network. It connects devices within a small area such as a home, school, office, or building.
Example: A network connecting computers in an office.

MAN stands for Metropolitan Area Network. It covers a larger area than a LAN and can connect networks across a city or a large campus.
Example: A network connecting different offices across a city.

WAN stands for Wide Area Network. It connects networks over large geographical areas such as cities, countries, or continents.
Example: The Internet is a well-known example of a large WAN.

PAN stands for Personal Area Network. It connects devices around an individual.
Example: A smartphone connected to wireless headphones.

LAN covers a small area, such as a home or office.
MAN covers a larger area, such as a city or large campus.
WAN covers a very large area, such as different cities or countries.

A router is a networking device that connects different networks. It forwards data packets toward their destination.

A network switch connects multiple devices within the same network and forwards data to the correct device.

A router is mainly used to connect different networks, while a switch is mainly used to connect devices within the same network.

ISP stands for Internet Service Provider. An ISP is a company or service provider that gives users access to the Internet.
Example: A broadband or mobile Internet provider.

An IP address is a numerical address used to identify a device on a network and help deliver data to the correct destination.
Example: An IPv4 address can look like 192.168.1.1.

A MAC address is an address used to identify a network interface. It is mainly used for communication within a local network.

An IP address helps identify and locate a device on a network, while a MAC address identifies the network interface of a device.

DNS stands for Domain Name System. It helps convert human-readable domain names into IP addresses.
Example: DNS helps a device find the IP address connected with a website domain.

When a user enters a domain name, DNS helps find the IP address associated with that domain. The browser can then use that address to connect to the correct server.

A domain name is a human-readable name used to identify a website or Internet resource.
Example: example.com
Domain names are easier for people to remember than numerical IP addresses.

A network protocol is a set of rules that tells devices how to communicate and exchange data over a network.

TCP stands for Transmission Control Protocol. It is used to provide reliable communication between devices.
TCP helps make sure that data is delivered correctly and in the proper order.

UDP stands for User Datagram Protocol. It provides connectionless communication and can be useful when fast data transmission is more important than guaranteed delivery.

TCP/IP stands for Transmission Control Protocol/Internet Protocol. It is a group of protocols used for communication across the Internet and computer networks.
TCP/IP helps with tasks such as addressing, routing, and data transmission.

HTTP stands for Hypertext Transfer Protocol. It is used to transfer information between web browsers and web servers.

HTTPS stands for Hypertext Transfer Protocol Secure. It is the secure version of HTTP and uses encryption to protect communication.

Ethernet is a wired networking technology. It uses network cables to connect devices and transfer data.

Wi-Fi is a wireless networking technology that allows compatible devices to connect to a network without using physical network cables.
Examples: Ethernet cables, fiber-optic cables, and coaxial cables.

A wired network connects devices using physical cables.
Examples: Ethernet cables, fiber-optic cables, and coaxial cables.

A wireless network allows devices to communicate without physical network cables.
Example: Wi-Fi networks.

Network topology describes how devices and connections are arranged in a network.

Common network topologies include:
Bus topology
Ring topology
Star topology
Mesh topology

In bus topology, multiple devices are connected to a main communication cable.

In ring topology, devices are connected in a circular arrangement.

In star topology, multiple devices are connected to a central device, such as a switch or hub.

In mesh topology, devices have multiple connections between them.
In a full mesh, every device is connected to other devices. In a partial mesh, only selected devices have multiple connections.

Packet switching is a method of sending data by dividing it into smaller packets. These packets travel through the network and are combined again when they reach the destination.

A server is a computer or system that provides data, applications, or services to other devices.
Examples: Web servers, file servers, and database servers.

Client-server architecture is a network model where clients request services or information from a central server.
Example: A web browser requests a webpage from a web server.

Peer-to-peer networking is a network model where connected computers can communicate and share resources directly with each other.
A central server is not always required in a peer-to-peer network.

An intranet is a private network used by an organization. It is normally available only to authorized users.
Example: An internal company network used by employees.

An extranet is a private network that allows selected external users or organizations to access certain resources.
Example: A company giving its business partners access to selected internal resources.

The Internet is a global network that can be accessed by users around the world.
An intranet is a private network designed for an organization and its authorized users.

Network security means protecting networks, devices, and data from unauthorized access, attacks, and other security threats.
Common network security methods include:
Encryption
Access control
Firewalls
Authentication

Cloud networking means using networking services and resources through cloud environments.
It can help organizations build flexible and scalable network systems.

A firewall monitors and controls network traffic based on security rules. It can allow or block network connections.