VLAN（Virtual Local Area Network）

VLAN（Virtual Local Area Network）is A LAN equipment logically divided into one network segment, so as to achieve the virtual workgroup emerging data exchange technology. This new technology are mainly applied in switches and routers, but the mainstream applications or among the switches. But not all switches have this function, only VLAN agreement layer 3 switches can have the above this function, it can check the corresponding switches can be the specification of the informed.

What is a VLAN

IEEE in 1999 promulgated the implementation scheme of the VLAN to standardization 802.1 Q agreement draft standards. The emergence of the VLAN technology, make according to actual application requirements, administrator of the same physical LAN different user logically divided into different broadcast domain, each a VLAN is consists of a set of the same requirements of computer workstation, and physical form on LAN have the same properties. Because it is from logically divided, not from physical divided, so the same VLAN within each workstation no restrictions on the same physical limits, namely, the workstation can in different physical LAN segment. From the characteristics of the VLAN knowable, a VLAN internal radio and unicast flow will not forwarding to other VLAN database, and helps to control flow, reducing equipment investment, simplified network management, improve the network security.

VLAN (Virtual Local Area Network)

VLAN (Virtual Local Area Network) is a local area network equipment will be logically divided into one network segment to realize a virtual working group on emerging data exchange technology. This emerging technology is mainly used in switches and routers, but among the mainstream or in the switch. But not all switches have this feature, only the VLAN protocol before the third layer above the switch has this feature, this can view the manual switch can be learned.
IEEE 1999 standard was enacted to implement the program 802.1Q VLAN protocol draft standard. VLAN technologies, allows the administrator based on the actual application requirements, the same physical LAN logically different users into different broadcast domains, each VLAN contains a set of computer workstations have the same needs, and the physical form of the LAN have the same properties. Since it is logically divided, rather than from the physical division, so the same VLAN is no limit to individual workstations within the same physical range, that is, these workstations can be in different physical LAN segment. Shows the characteristics of the VLAN, a VLAN within the broadcast and unicast traffic is not forwarded to another VLAN, and thus help control traffic, reduce equipment investment, simplifying network management, improve network security.