Types of Computer Networks
Topic: Networking , NETWORKING BASICS
Types of Computer Networks
Computer networks can be classified based on their size, geographical coverage, purpose, and how devices are connected.
The most common types of computer networks are:
- PAN
- LAN
- WLAN
- CAN
- MAN
- WAN
- SAN
- VPN
1. PAN — Personal Area Network
PAN stands for Personal Area Network.
A PAN is a small network used to connect devices around an individual, usually within a short range.
Example
Smartphone
|
Bluetooth
|
Earbuds
Another example:
Laptop ─── Bluetooth ─── Smartphone
Common PAN Technologies
- Bluetooth
- USB
- NFC
- Infrared
Examples
- Connecting wireless earbuds to a phone
- Connecting a smartwatch to a smartphone
- Sharing files between nearby personal devices
Key Points
- Very small geographical area
- Usually personal devices
- Short communication range
- Can be wired or wireless
2. LAN — Local Area Network
LAN stands for Local Area Network.
A LAN connects devices within a limited geographical area.
Examples include:
- Home
- Office
- School
- Computer laboratory
- Small building
Example
Router
|
Switch
/ | \
PC1 PC2 PC3
|
Printer
The devices in this example are connected to the same local network.
Characteristics of LAN
- Covers a small geographical area
- Usually privately managed
- High-speed communication
- Commonly uses Ethernet and Wi-Fi
- Used for resource sharing
Example
An office may have 50 computers connected through switches. All these computers can communicate with internal servers and printers.
3. WLAN — Wireless Local Area Network
WLAN stands for Wireless Local Area Network.
A WLAN is a LAN that uses wireless communication instead of physical network cables for connecting devices.
Example
Internet
|
Router
|
Wi-Fi Network
/ | \
Laptop Phone Smart TV
Wi-Fi is the most common technology used to create WLANs.
WLAN Advantages
- No Ethernet cable required for client devices
- Easy to expand
- Supports mobile devices
- Convenient for users
WLAN Examples
- Home Wi-Fi
- Office Wi-Fi
- School Wi-Fi
- Public Wi-Fi
4. CAN — Campus Area Network
CAN stands for Campus Area Network.
A CAN connects multiple LANs within a limited campus or organizational area.
For example, a university may have separate networks for different buildings.
Main Network
|
┌──────┼──────┐
↓ ↓ ↓
Building Building Building
A B C
LAN LAN LAN
Examples
- University campus
- College campus
- Corporate campus
- Research facility
Characteristics
- Larger than a LAN
- Smaller than a MAN
- Connects multiple LANs
- Usually managed by one organization
5. MAN — Metropolitan Area Network
MAN stands for Metropolitan Area Network.
A MAN connects multiple networks across a city or metropolitan area.
It is larger than a LAN but generally smaller than a WAN.
Example
City Network
|
┌────────┼────────┐
↓ ↓ ↓
Office A Office B Office C
LAN LAN LAN
A company may use a metropolitan network to connect offices located in different parts of a city.
Characteristics
- Covers a city or metropolitan region
- Larger than LAN
- Can connect multiple LANs
- Often uses high-speed links
6. WAN — Wide Area Network
WAN stands for Wide Area Network.
A WAN connects networks across large geographical areas such as different cities, states, countries, or continents.
Example
City A
Office
|
WAN Link
|
City B
Office
|
WAN Link
|
City C
Office
WAN Examples
- Corporate networks connecting branches
- Bank networks
- Telecom networks
- Global enterprise networks
The Internet is the largest example of an interconnected global network, though it is more precise to describe it as a global network of networks rather than simply one WAN.
WAN Technologies
Examples include:
- MPLS
- Leased Lines
- VPN
- SD-WAN
- Internet connections
- Cellular networks
7. SAN — Storage Area Network
SAN stands for Storage Area Network.
A SAN is a specialized high-speed network designed to provide access to centralized storage systems.
It is commonly used in:
- Data centers
- Enterprise environments
- Server infrastructure
Example
Server 1 ───┐
|
Server 2 ───┼── SAN ─── Storage
|
Server 3 ───┘
Servers can access storage resources over the dedicated storage network.
SAN Technologies
Common SAN technologies include:
- Fibre Channel
- iSCSI
- Fibre Channel over Ethernet
8. VPN — Virtual Private Network
VPN stands for Virtual Private Network.
A VPN creates an encrypted connection over an existing network, commonly the Internet.
Example
Office Network
|
VPN
|
Internet
|
VPN
|
Remote Employee
A remote employee can use a VPN to securely access resources inside an organization’s private network.
Common VPN Uses
- Remote access
- Site-to-site connectivity
- Secure communication over untrusted networks
- Connecting branch offices
Network Types Comparison
| Network | Full Form | Typical Coverage | Common Use |
|---|---|---|---|
| PAN | Personal Area Network | Personal space | Personal devices |
| LAN | Local Area Network | Home/building | Office and home networks |
| WLAN | Wireless LAN | Home/building | Wi-Fi networks |
| CAN | Campus Area Network | Campus | Universities and organizations |
| MAN | Metropolitan Area Network | City | Metropolitan connectivity |
| WAN | Wide Area Network | Large geographic area | Branch and global networks |
| SAN | Storage Area Network | Data center | Storage connectivity |
| VPN | Virtual Private Network | Depends on underlying network | Secure remote connectivity |
LAN vs WAN
LAN and WAN are two important network types.
LAN
Small Area
↓
Office
↓
High-speed local connectivity
WAN
Large Area
↓
City → State → Country → Global
↓
Connects different networks
Main Difference
LAN is generally used to connect devices within a limited local area, while WAN connects networks over larger geographical areas.
PAN vs LAN
| Feature | PAN | LAN |
|---|---|---|
| Coverage | Very small | Local area |
| Main purpose | Personal devices | Local resource sharing |
| Example | Phone + smartwatch | Office network |
| Common technologies | Bluetooth, USB, NFC | Ethernet, Wi-Fi |
LAN vs MAN vs WAN
PAN
↓
LAN
↓
CAN
↓
MAN
↓
WAN
As geographical coverage increases, the network can connect increasingly larger areas.
For example:
Home
↓
LAN
University
↓
CAN
City
↓
MAN
Multiple Cities / Countries
↓
WAN
Real-World Example
Consider a company with offices in three cities.
Internet / WAN
/ | \
/ | \
Jaipur Delhi Mumbai
| | |
LAN LAN LAN
| | |
PCs/Server PCs/Server PCs/Server
Inside each office, a LAN connects computers and other devices.
The company’s WAN connects the different office networks.
If employees connect remotely, a VPN may be used to provide secure access to internal resources.
Important Points
Remember:
- PAN → Personal devices
- LAN → Local network
- WLAN → Wireless LAN
- CAN → Campus network
- MAN → Metropolitan/city network
- WAN → Large geographical network
- SAN → Storage network
- VPN → Encrypted virtual connection over an existing network
Quick Quiz
1. What does LAN stand for?
A. Large Area Network
B. Local Area Network
C. Logical Area Network
D. Long Area Network
Answer: B
2. Which network is designed for personal devices?
A. WAN
B. MAN
C. PAN
D. SAN
Answer: C
3. Which network commonly connects multiple LANs across a city?
A. PAN
B. MAN
C. LAN
D. SAN
Answer: B
4. Which network is designed specifically for storage connectivity?
A. SAN
B. PAN
C. MAN
D. WLAN
Answer: A
5. What does WLAN mean?
A. Wide Local Area Network
B. Wireless Local Area Network
C. Web Local Area Network
D. Wired Local Area Network
Answer: B
Summary
In this tutorial, you learned about different types of computer networks:
- PAN
- LAN
- WLAN
- CAN
- MAN
- WAN
- SAN
- VPN
The classification of a network depends on factors such as coverage area, purpose, technology, and architecture.
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