1.6 Overview of Different Networks Based on Coverage [PAN / LAN / MAN / WAN]

 

1.6 Overview of Different Networks Based on Coverage

 

A computer network is a group of two or more computers and devices connected through wired or wireless communication media to exchange data, communicate, and share resources such as hardware, software, and files.

In simple words, a computer network allows multiple computers to work together and share information and resources efficiently.

 

How It Works

1. Two or more computers are connected using wired or wireless media.
2. The connected devices communicate by following network protocols.
3. Users can exchange data and share resources.
4. The network allows devices to communicate quickly and efficiently.

 

Features of a Computer Network

1. Resource Sharing

A computer network allows users to share hardware devices such as printers, scanners, hard disks, and software among multiple computers.

2. Communication

It enables users to communicate and exchange information through the Internet using services like email, messaging, and video conferencing.

3. Centralized Administration

The entire network can be managed and controlled from a central location, making administration easier.

4. Data Backup

Networks provide facilities for centralized data and software backup, reducing the risk of data loss.

 

Services Provided by a Computer Network

• Print Service: Allows multiple users to share a printer.
• File Service: Enables users to store and share files.
• Database Service: Allows users to access a common database.
• Application Service: Shares software applications across the network.
• Message Service: Supports communication through email and messaging.

 

Advantages of a Computer Network

• Shares hardware and software resources.
• Enables fast communication.
• Reduces overall cost by sharing devices.
• Supports centralized management.
• Makes data backup easier.
• Allows information sharing worldwide.

 

Types of Networks Based on Coverage Area

Type	Full Form	Coverage Area
PAN	Personal Area Network	Around one person (1-10 m)
LAN	Local Area Network	Room, office, school, building
MAN	Metropolitan Area Network	City or metropolitan area
WAN	Wide Area Network	Country or worldwide

 

 

 

 

 

Types of Computer Networks Based on Coverage Area (geographical area)

 

1. PAN (Personal Area Network)                            2. LAN (Local Area Network)

3. MAN (Metropolitan Area Network)                   4. WAN (Wide Area Network)

 

1.6.1 PAN (Personal Area Network)

A Personal Area Network (PAN) is the smallest type of computer network that connects devices around a single person within a short distance, usually up to 10 metres. It is mainly used for personal communication and data sharing between nearby devices.

 

How It Works

1. A PAN connects personal devices located close to one another.
2. The devices communicate using wired or wireless technologies such as Bluetooth or USB.
3. Users can easily share files, data, and Internet connections between the connected devices.

Features of PAN

1. Small Coverage Area

A PAN covers a very short distance, usually up to 10 metres.

2. Connects Personal Devices

It connects personal devices such as smartphones, laptops, tablets, smartwatches, wireless earbuds, keyboards, mice, and printers.

3. Data Sharing

It allows users to transfer files, photos, videos, music, and other data between connected devices.

4. Easy to Set Up

A PAN is simple to install and requires only basic configuration.

5. Low Cost

Most PANs use built-in technologies like Bluetooth or USB, making them inexpensive to use.

6. Personal Use

A PAN is designed for a single user and is mainly used for personal purposes.

 

Technology Used

• Bluetooth , USB Cable , NFC (Near Field Communication) , Infrared (IR) (less common today)

Advantages

• Easy to install and use.
• Low installation cost.
• Supports quick file sharing.
• Requires very little power.
• Portable and convenient for personal use.

Disadvantages

• Covers only a short distance.
• Can connect only a limited number of devices.
• Not suitable for large offices or organizations.
• Wireless PANs may experience interference.

Common Devices

Smartphone , Laptop , Tablet , Smartwatch , Wireless earbuds , Keyboard , Mouse , Printer , Fitness tracker

Examples

• A smartphone connected to Bluetooth earbuds.
• A laptop connected to a wireless mouse and keyboard.
• Sharing files between two smartphones using Bluetooth.
• A smartwatch connected to a smartphone.

Real-Life Example

A student connects a smartphone to a Bluetooth smartwatch and wireless earbuds to receive notifications, listen to music, and answer calls without using cables.

1.6.2 LAN (Local Area Network)

 

A Local Area Network (LAN) is a computer network that connects computers and devices within a small geographical area, such as a room, office, school, college, building, or campus. It is mainly used to share data, resources, and Internet connections at high speed.

 

How It Works

1. Multiple computers and devices are connected using wired or wireless media.
2. The connected devices communicate and share files, printers, software, and Internet access.
3. A LAN may use a server to manage network resources or work without a server in small networks.

 

Features of LAN

1. Small Coverage Area

A LAN covers a limited geographical area such as a room, office, school, building, campus, or a few kilometres.

2. High-Speed Data Transfer

LAN provides faster data transmission than MAN and WAN.

3. Resource Sharing

Users can share printers, scanners, files, software, and Internet connections among multiple computers.

4. Wired or Wireless Connection

LAN can use Ethernet cables (wired LAN) or Wi-Fi (Wireless LAN or WLAN).

5. Reliable Communication

LAN provides reliable communication with a low transmission error rate.

6. Supports Multiple Devices

It allows many computers and network devices to communicate and share resources.

 

Technology Used

• Ethernet (UTP/CAT6 cable) , Wi-Fi (WLAN) , Switch , Router , Network Interface Card (NIC)

 

Advantages

• High-speed communication.
• Easy sharing of hardware and software.
• Low installation and maintenance cost.
• Easy to manage and expand.
• Reliable and secure within a limited area.

 

Disadvantages

• Covers only a limited geographical area.
• Initial setup cost can be high.
• A server failure may affect the entire network (in client-server LANs).
• Requires proper network administration in large LANs.

 

Examples

• School computer laboratory
• Office network
• College computer lab
• Home Wi-Fi network
• Library computer network

 

Real-Life Example

A school's computer lab has 30 computers connected to a switch and a server. Students can access shared files, printers, and the Internet through the school's LAN.

1.6.3 MAN (Metropolitan Area Network)

 

A Metropolitan Area Network (MAN) is a computer network that connects multiple Local Area Networks (LANs) within a city, metropolitan area, or valley. It covers a larger area than a LAN but a smaller area than a WAN.

 

How It Works

1. Multiple LANs located in different buildings or branches are connected together.
2. The connection is established using fiber optic cables, leased lines, or wireless communication.
3. Users in different locations within the same city can communicate and share resources efficiently.

 

Features of MAN

1. Medium Coverage Area

A MAN covers a city, metropolitan area, valley, or large campus.

2. Connects Multiple LANs

It links several LANs to create a larger network.

3. High-Speed Communication

MAN provides faster data transfer than WAN but is generally slower than LAN.

4. Resource Sharing

It enables users in different branches to share files, databases, applications, and Internet resources.

5. Single or Multiple Ownership

A MAN may be owned and managed by a single organization or jointly by multiple organizations or service providers.

6. Connects LAN to WAN

It acts as a bridge between LANs and larger WAN networks or the Internet.

 

Technology Used

• Optical Fiber Cable , Leased Line , Microwave Links , Metro Ethernet , Wireless Communication

 

Advantages

• Connects multiple offices or branches within a city.
• Provides high-speed communication.
• Supports centralized management.
• Allows efficient sharing of resources.
• More cost-effective than creating separate WAN connections.

 

Disadvantages

• More expensive than a LAN.
• Installation and maintenance are more complex.
• Requires skilled network management.
• Covers only a city or metropolitan area.

 

Examples

• A bank connecting all its branches within Kathmandu Valley.
• A university connecting different campuses across a city.
• Cable TV network.
• Telephone network providing high-speed DSL services.
• A municipal government network connecting different offices.

Real-Life Example

A bank has branches in Chabahil, Baneshwor, Koteshwor, and New Baneshwor. All the branches are connected through a MAN, allowing staff to access the same customer database and banking services.

 

1.6.4 WAN (Wide Area Network)

A Wide Area Network (WAN) is the largest type of computer network that connects computers, LANs, and MANs over a very large geographical area, such as countries or continents. It enables communication and resource sharing across long distances.

How It Works

1. Multiple LANs and MANs are connected using long-distance communication links.
2. Data is transmitted through communication media such as optical fiber cables, telephone lines, satellites, microwave links, and mobile networks.
3. Internet Service Providers (ISPs) and telecommunication companies manage and maintain most WAN connections.

Features of WAN

1. Very Large Coverage Area

A WAN covers a very large geographical area, including countries, continents, or even the entire world.

2. Connects Multiple Networks

It connects multiple LANs and MANs to form a large network.

3. Multiple Ownership

A WAN is usually owned and managed by multiple organizations and Internet Service Providers (ISPs).

4. Uses Public Communication Networks

WAN communication is provided through telephone networks, optical fiber cables, satellites, mobile networks, and other telecommunication services.

5. Lower Speed than LAN and MAN

WAN generally provides lower data transfer speed and higher communication delay than LAN and MAN because data travels over long distances.

6. Long-Distance Communication

It enables communication and resource sharing between users located anywhere in the world.

Technology Used

• Optical Fiber Cable , Satellite Communication , Telephone Network
• Microwave Links , 4G/5G Mobile Networks , Undersea Fiber Optic Cables

Advantages

• Connects computers across countries and continents.
• Supports global communication.
• Enables remote access to information and resources.
• Facilitates online services such as email, cloud computing, and video conferencing.
• Connects branch offices worldwide.

Disadvantages

• High installation and maintenance cost.
• Slower than LAN and MAN.
• Higher communication delay (latency).
• More difficult to manage and secure.
• Depends on telecommunication service providers.

Examples

• The Internet , 4G and 5G Mobile Networks
• Satellite Communication Systems , International Banking Networks , Airline Reservation Systems

Real-Life Example

A multinational company has offices in Kathmandu, Delhi, London, and New York. All the offices are connected through a WAN, allowing employees to share files, access the company's database, and communicate with each other over the Internet.

🌟 Fun Fact

The first computer network, called ARPANET, was created in 1969 and became the foundation of today's Internet. The first message sent over ARPANET was supposed to be "LOGIN", but the system crashed after sending only "LO". So, the first message in Internet history was simply "LO"! 😄