A VLAN allows an Administrator to create a group of logic devices that are connected to each other. With VLAN, we can divide the network switch to logically by function, department or project team.VLANs are a small part of a separate IP network logically. VLANs allow multiple IP networks and smaller networks (subnets) within the same switched network switched. In order for computers to communicate on the same VLAN, each computer must have an IP address and Subnet Mask corresponding to the VLAN. Switches must be configured with a VLAN and every port in the VLAN must be registered to a VLAN. A switch port that has been configured with a single VLAN is referred to as an access port.The advantages of a VLANApplication of a VLAN technology allows a network to be more flexible to support business goals. Here are some advantages of using VLANs:
• Security-Department who have sensitive data separate from the existing network, would reduce the chances of breach of access to confidential and important information.• Cost reduction - the cost savings resulting from not need an expensive cost for network upgrades and efficient use of available bandwidth and uplink.• Higher performance - With a split layer 2 network into multiple logical worksgroup (broadcast domain) to reduce unnecessary traffic on the network and improve performance.• Broadcast storm mitigation - By dividing a network into VLANs reduce the amount of equipment that participate in the broadcast storm.• Improved IT staff efficiency - With VLAN network management easier, because users with the needs of the same network share the same VLAN.• Simpler project or application management - Having separate functions simplify the management of a project or work with specific applications.
Sources:LAN Switching and Wireless, CCNA Exploration 4.0, Cisco Systems, 2007.
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