Question

Explain the Mesh Network Topology, with the help of a diagram.

Hint:

Wired physical mesh topology is rarely deployed in standard local networks (LANs) due to cost and port limitations. However, it is widely used in wireless networks (Wi-Fi Mesh) and WAN backbone routing.

Answer 1

Step 1: Architectural Concept of Mesh Topology:
In a physical Mesh Topology, network nodes are connected to each other through redundant paths. Unlike star or bus topologies where data must pass through a single central hub or line, mesh nodes can route packets directly to neighboring devices. It is classified into two types:

• Full Mesh: Every single node is connected directly to every other node in the network. For a network of $n$ nodes, the total number of physical links required is given by the formula: $$\text{Links} = \frac{n(n - 1)}{2}$$
• Partial Mesh: Nodes are connected redundantly, but only high-traffic or critical servers are connected directly to all other devices.

Step 2: Key Advantages and Disadvantages:
This topology has several distinct performance characteristics:

• Advantages: High fault tolerance. If one cable fails, routing protocols instantly redirect data through alternative paths (e.g., from A to C through B), ensuring zero network downtime.
• Disadvantages: Extremely expensive and complex to install due to the massive amount of cabling and the large number of physical ports required on each device.