Virtual LANs are essentially Layer 2 constructs , compared with Layer 3 IP subnet construction . In an environment using VLANs , a one - to - one often exists between VLANs and IP subnets , although it is possible to have multiple subnets on one VLAN or have one subnet spread across multiple VLANs . Virtual LANs and IP subnets provide independent Layer 2 and Layer 3 constructs that map to each other and this correspondence is useful during the network design process . By using VLAN , we can control traffic patterns and react quickly to relocations . VLANs provide the flexibility to adapt to changes in network requirements and allow for administration disederhanakan.VLAN used to provide 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 .
So if it can be concluded that the VLAN is a LAN network that is created as the virtualized no other networks within the LAN itself. Do not confuse what I mean : D
If still confused can ask your teacher or you can ask the nick zerokid via FB or Twitter @ wong_Ganth3n9 .
Usefulness VLAN :
1 . Prevent the occurrence of collision domains
2 . Narrowing the possibility that too many IP conflict
3 . Reducing the level of vulnerabilities
The concept of Virtual LANs
Before understanding the Virtual LAN , a specific understanding of the definition of a LAN is required . A LAN includes all devices in the same broadcast domain . A broadcast domain includes a group of network devices that are connected in a LAN network can send a broadcast frame , and all the other devices in the same LAN segment will receive a copy of the frame . so it could be said that a LAN network and a broadcast domain in principle is the same thing .
Without VLANs , a switch treats all interfaces on the switch as being on the same broadcast domain - in other words , all devices connected to the switch are in the same LAN . With the VLAN , a switch can put one or multiple interfaces ( read port ) is on a VLAN interface while the other was on the other VLAN . So basically , the switch creates multiple broadcast domains . Each broadcast domain created by the switch are called virtual LANs .
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