02 Types of networks and network topologies

• 1. Types of Networks
  • [[#1. Types of Networks#A. Based on Coverage Area|A. Based on Coverage Area]]
    • [[#A. Based on Coverage Area#1. Personal Area Network (PAN)|1. Personal Area Network (PAN)]]
    • [[#A. Based on Coverage Area#2. Local Area Network (LAN)|2. Local Area Network (LAN)]]
    • [[#A. Based on Coverage Area#3. Metropolitan Area Network (MAN)|3. Metropolitan Area Network (MAN)]]
    • [[#A. Based on Coverage Area#4. Wide Area Network (WAN)|4. Wide Area Network (WAN)]]
  • [[#1. Types of Networks#B. Based on Ownership|B. Based on Ownership]]
    • [[#B. Based on Ownership#1. Private Network|1. Private Network]]
    • [[#B. Based on Ownership#2. Public Network|2. Public Network]]
  • [[#1. Types of Networks#C. Based on Connectivity|C. Based on Connectivity]]
    • [[#C. Based on Connectivity#1. Wired Networks|1. Wired Networks]]
    • [[#C. Based on Connectivity#2. Wireless Networks|2. Wireless Networks]]
• 2. Network Topologies
  • [[#2. Network Topologies#1. Bus Topology|1. Bus Topology]]
  • [[#2. Network Topologies#2. Star Topology|2. Star Topology]]
  • [[#2. Network Topologies#3. Ring Topology|3. Ring Topology]]
  • [[#2. Network Topologies#4. Mesh Topology|4. Mesh Topology]]
  • [[#2. Network Topologies#5. Tree (Hierarchical) Topology|5. Tree (Hierarchical) Topology]]
  • [[#2. Network Topologies#6. Hybrid Topology|6. Hybrid Topology]]
• Summary

1. Types of Networks

A network is a group of devices connected to share resources, communicate, and exchange data. Networks can be classified based on their size, geographical coverage, and purpose.

A. Based on Coverage Area

1. Personal Area Network (PAN)

A Personal Area Network (PAN) is the smallest type of network, typically used for connecting personal devices within a short range. It allows devices such as smartphones, laptops, tablets, and smartwatches to communicate wirelessly or via wired connections.

• Range: Usually up to 10 meters
• Examples: Bluetooth connections, Infrared communication, Wireless USB
• Applications:
  • Connecting a smartphone to wireless earbuds
  • Syncing data between a phone and a smartwatch
  • Transferring files between two devices using Bluetooth

2. Local Area Network (LAN)

A Local Area Network (LAN) is a network that connects multiple computers and devices within a small geographical area such as a home, office, school, or a single building. LANs are widely used for file sharing, resource sharing (like printers), and internet access.

• Range: Covers up to a few kilometers
• Examples: Ethernet networks in offices, Wi-Fi networks at home
• Applications:
  • Sharing printers, files, and applications within an office
  • Providing internet access to multiple devices in a home or school
  • Gaming networks in cybercafés

3. Metropolitan Area Network (MAN)

A Metropolitan Area Network (MAN) covers a larger geographical area than a LAN, typically spanning a city or a large campus. It connects multiple LANs to facilitate communication and resource sharing over a broader area.

• Range: Covers several kilometers
• Examples: City-wide Wi-Fi, cable TV networks, metro fiber networks
• Applications:
  • Connecting different university campuses within a city
  • Providing broadband internet access across urban areas
  • Linking various government offices in a metropolitan region

4. Wide Area Network (WAN)

A Wide Area Network (WAN) is the largest type of network, covering a country, continent, or even the entire world. It interconnects multiple LANs and MANs, usually using public or private telecommunication networks.

• Range: Spans hundreds to thousands of kilometers
• Examples: The Internet, MPLS networks, leased lines
• Applications:
  • Providing global communication through the Internet
  • Connecting multinational corporations’ branch offices
  • Enabling secure communication via Virtual Private Networks (VPNs)

B. Based on Ownership

1. Private Network

A private network is controlled and managed by a single organization, providing secure and restricted access to authorized users.

• Examples:
  • Corporate intranets used within companies
  • VPNs (Virtual Private Networks) for secure remote access

2. Public Network

A public network is accessible to anyone and is typically managed by telecom providers or ISPs (Internet Service Providers).

• Examples:
  • The Internet, which is available to users worldwide
  • Public Wi-Fi hotspots in airports and cafés

2. Network Topologies

Network topology refers to how devices (nodes) are arranged in a network. The choice of topology affects network performance, scalability, cost, and fault tolerance.

1. Bus Topology

In a bus topology, all devices are connected to a single central cable (backbone) that carries data.

• Advantages:

  • Cost-effective (requires minimal cabling)
  • Simple to set up and expand

• Disadvantages:

  • If the backbone cable fails, the entire network stops working
  • Performance degrades as more devices are added

• Example: Early Ethernet networks used a bus topology

2. Star Topology

In a star topology, all devices are connected to a central hub or switch, which manages data transmission.

• Advantages:

  • Easy to troubleshoot (fault in one device does not affect others)
  • Scalable (new devices can be easily added)

• Disadvantages:

  • Failure of the central hub can disrupt the network
  • More cabling is required compared to a bus topology

• Example: Most modern Ethernet LANs use a star topology

3. Ring Topology

In a ring topology, devices are connected in a circular fashion, and data travels in one or both directions.

• Advantages:

  • Efficient data transmission (no data collisions)
  • Predictable performance under high loads

• Disadvantages:

  • A single node failure can disrupt the network (unless a dual-ring is used)
  • Slower compared to star topology

• Example: FDDI (Fiber Distributed Data Interface) networks

4. Mesh Topology

In a mesh topology, every device is connected to every other device in the network, ensuring multiple communication paths.

• Advantages:

  • High redundancy (if one path fails, another is used)
  • Fast and reliable communication

• Disadvantages:

  • Very expensive due to extensive cabling
  • Complex setup and maintenance

• Example: Military communication networks, IoT applications

5. Tree (Hierarchical) Topology

A tree topology combines characteristics of star and bus topologies, with multiple star networks connected to a central backbone.

• Advantages:

  • Scalable (easy to expand the network)
  • Well-structured and organized

• Disadvantages:

  • If the backbone fails, the entire network is affected
  • High cabling and maintenance costs

• Example: Large corporate or university networks

6. Hybrid Topology

A hybrid topology is a combination of two or more topologies, depending on network needs.

• Advantages:

  • Highly flexible and scalable
  • Optimized for different types of communication

• Disadvantages:

  • Complex and expensive to set up

• Example: Data centers combining star and mesh topologies