This post illustrates two examples for subnet creation. In the first example, an office network with two departments is taken and in the second example, an office network with four departments is taken.
This post gives an overview of VLAN. It describes the process of VLAN trunking, VLAN tagging, VLAN port types, VLAN classification methods. It also gives a brief overview of the basic theory of operation of a VLAN aware L2 Switch.
This post gives a brief description of the basic theory of operation of the Spanning Tree Algorithm. It describes the problem of L2 broadcast frame loops in a L2 Network due to redundant paths and then describes how the spanning tree algorithm overcomes this problem.