What is Mesh Topology ?

          In a mesh topology, every device has a dedicated point-to-point link to every other device. The term dedicated means that the link carries traffic only between the two devices it connects. To find the number of physical links in a fully connected mesh network with n nodes, we first consider that each node must be connected to every other node. Node 1 must be connected to n - I nodes, node 2 must be connected to n - 1 nodes, and finally node n must be connected to n - 1 nodes. We need n(n - 1) physical links. However, if each physical link allows communication in both directions (duplex mode), we can divide the number of links by 2. In other words, we can say that in a mesh topology, we need    n(n -1) /2    duplex-mode links.
          To accommodate that many links, every device on the network must have n - input/output (VO) ports (see Figure) to be connected to the other n - 1 stations.

Advantages and Disadvantages of Mesh Topology