Computer Fundamentals Topic 8: Networking Basics - Lesson 1
LAN, WAN, Routers, And IP Addresses
Understand local and wide networks and how devices are addressed.
Networks And Scope
A computer network is a group of connected devices that can communicate and share resources.
A LAN covers a local area such as a home, school, or office. A WAN covers a larger area and can connect many LANs.
- LAN means Local Area Network.
- WAN means Wide Area Network.
- The internet is the largest WAN.
Routers And Addresses
A router connects networks and directs traffic between them. In a home, it usually connects the local network to the internet.
An IP address identifies a device on a network so data can reach the right destination.
- Private IP addresses are used inside local networks.
- Public IP addresses are used on the internet.
- Routers often translate between private and public addresses.
Networks As Addressed Communication
A network is not just devices being near each other. The devices need rules for addressing, sending, receiving, and checking data. Without addressing, a message would not know where to go.
In a home network, your phone, laptop, smart TV, and printer may all have local addresses. The router helps those devices communicate with each other and with the wider internet.
- Devices need addresses to communicate.
- Local networks connect nearby devices.
- Routers connect different networks.
- Network rules are called protocols.
LAN, WAN, And The Internet
A LAN is a local network, such as the network inside a home or school. It is usually controlled by one person or organization. A WAN covers a much larger area and connects many smaller networks.
The internet is a huge network of networks. Your home router does not connect directly to every website. It sends traffic through your internet service provider and many other networks until the data reaches the destination.
- LAN: small local area.
- WAN: large wide area.
- ISP: company that provides internet access.
- Internet: many networks connected together.
Private And Public Addresses
Home devices often use private IP addresses that work only inside the local network. The router has a public-facing connection to the internet. It translates traffic between private local devices and outside services.
This translation is one reason many devices can share one internet connection. It also means a device's local address may not be visible directly to websites on the internet.
- Private IP addresses are used inside local networks.
- Public IP addresses are used across the internet.
- Routers forward traffic between networks.
- Address translation helps many devices share one connection.
Quick Summary
- A network lets devices communicate.
- LANs are local; WANs cover larger areas.
- Routers connect networks.
- IP addresses identify network devices.
Practice Quiz
Now practice this lesson with MCQs and explanations: