VLAN(Virtual Local Area Network) is a logical grouping of network users and resources connected to administratively defined ports on a switch. VLAN's break up broadcast domains in layer 2 switch network.
A technology called VLAN (Virtual LAN broadcast domains logically segmented on an Ethernet switch) trunking that was once primarily the domain of network switches has now trickled down to the rest of the Data Center to address these issues. Now it is possible for these multi-homing devices to be multi-homing in function without the need for multiple physical network adapters and the additional infrastructure associated with them. VLAN trunking allows a single network adapter to behave as n number of virtual network adapters where n has a theoretical upper limit of 4096 but is typically limited to 1000 VLAN network segments. In the case where a single gigabit Ethernet adapter is trunked in place of using multiple FastEthernet adapters higher performance at a lower cost while increasing flexibility can be achieved. This really is the best of all worlds. In this article I will give you an overview of VLAN trunking how it works what it is used for.
Short for virtual LAN a network of computers that behave as if they are connected to the same wire even though they may actually be physically located on different segments of a LAN VLANs are configured through software rather than hardware which makes them extremely flexible. One of the biggest advantages of VLANs is that when a computer is physically moved to another location it can stay on the same VLAN without any hardware reconfiguration.
VLAN is used to increase security in a network. a data can be shared among some of the members in a network. all those members are grouped logically to for a virtual LAN.
A virtual LAN commonly known as a VLAN is a group of hosts with a common set of requirements that communicate as if they were attached to the same wire regardless of their physical location. A VLAN has the same attributes as a physical LAN but it allows for end stations to be grouped together even if they are not located on the same LAN segment. Network reconfiguration can be done through software instead of physically relocating devices. VLANs are created to provide the segmentation services traditionally provided by routers in LAN configurations. VLANs address issues such as scalability security and network management. Routers in VLAN topologies provide broadcast filtering security address summarization and traffic flow management. By definition switches may not bridge IP traffic between VLANs as it would violate the integrity of the VLAN broadcast domain. Virtual LANs are essentially Layer 2 constructs whereas IP subnets are Layer 3 constructs.
