VLANs Concept

VLAN stands for Virtual Local Area Network and is defined as a group of devices on one or more LANs that are configured so that they looks like they are connected to one LAN. The Main functions of a VLAN are to segment a LAN, form logical Groups and to limit the broadcasts to legitimate users only that helps in increasing security.

Using ASA to Perform Stateful Filtering

Using Zone Base Firewall to Perform Stateful Filtering

Using CBAC (Context Base Access Control) for stateful Filtering

CBAC (Context Base Access Control) is both a stateful and an application firewall that is it can filter traffic from network layer to Application Layer. 

How to Perform Stateful Filtering

This article defines the Methods that can be used for performing Stateful Filtering.

Stateful filtering/ Dynamic Packet Filtering

Stateful Filtering or Stateful Inspection also termed as dynamic packet filtering is a technique developed by checkpoint software technologies in 1993. 

Configuration of VLANs

Creating VLANs in Cisco Switch
For configuration of VLANs we assume that you have basic knowledge of VLANs if you don't have any idea about VLANs then Click Here to get some knowledge about VLANs.