What is a Virtual LAN (VLAN) and How Does it Work ?

what is VLAN
A Virtual Local Area Network (VLAN) may be a group of hosts that feature a like set of requirements and may communicate as if they were all connected via an equivalent wires. However, unlike a standard LAN, a VLAN isn't necessarily beat an equivalent place, and therefore the hosts involved within the network are often located practically anywhere. All VLANs have the precise same attributes as a standard physical local area network, though they will be configured via software rather than having to truly relocate the hosts.

Many VLANs are designed as replacements to the services that are traditionally provided by routers on physical LANs. VLANs are ready to tackle issues like network management, security, and scalability with ease.

VLANs are referred to as Layer 2, or link layer, constructs which transfer data between network nodes. Because they're Layer 2 constructs, they will interface with Layer 3 IP subnets with a 1 to at least one relationship.

How are VLAN designed?

The IEEE assigned IEEE 802.1Q because the protocol by which to configure virtual LANs. IEEE 802.1Q provides for a header with a 2-byte protocol identifier and another 2-byte tag control information. These are known as TPID and TCI, respectively. The TPID is fixed at 0x8100 while the TCI contains information concerning the user priority, canonical format indicator, and VLAN identifier.

What are the two types of VLAN memberships?

VLAN membership are often assigned in one among two ways. Static or Dynamic.

A Static VLAN is additionally referred to as a port based VLAN. These sorts of VLANs are created by assigning specific ports to a VLAN. As new devices enter into the VLAN network, the device assumes a selected port. If end users change ports but require access to an equivalent VLAN, network administrators are required to assign new port to VLAN assignments for the new port.

A Dynamic VLAN is meant to be easily configured using software. The most common software for designing dynamic VLANs is CiscoWorks, a program developed by Cisco. A VLAN Management Policy Server (VMPS) must be found out first for a dynamic VLAN. This server will allow the VLAN to automatically switch ports whenever new devices hook up with the VLAN. It uses information like the device’s ports, unique usernames, and MAC addresses to work out whether or to not change ports to suit the requirements of the incoming device.
Muhammad Arif
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