VLAN - Logically group network devices forming seperate LAN. Network devices can be physically located anywhere without any boundary restrictions.
It helps to bring down the size of broadcast domain.
It is layer 2 feature. VLAN tag inserted into the ethernet header.
Within same switch ports can grouped into different vlans. Only ports which are part of the same vlan can talk to each other. They can not talk to ports of other vlan.
A VLAN represents a broadcast domain. VLANs are identified by a VLAN ID (a number between 0 – 4095), with the default VLAN on any network being VLAN 1. Each port on a switch or router can be assigned to be a member of a VLAN (i.e., to allow receiving and sending traffic on that VLAN). For example: on a switch, traffic that is sent to a port that is a member of VLAN 100, may be forwarded to any other VLAN 100 port on the switch, and it can also travel across a trunk port (connections between switches) to another switch and forwarded to all VLAN 100 ports on that switch. Traffic won't, however, be forwarded to ports that are on a different VLAN ID.
In order to implement VLANs, the routers and switches must support VLANs. Although there are several proprietary protocols in existence, the most commonly used protocol for configuring VLANs is IEEE 802.1Q. Switches that support VLANs are often called "Managed" switches,
It helps to bring down the size of broadcast domain.
It is layer 2 feature. VLAN tag inserted into the ethernet header.
Within same switch ports can grouped into different vlans. Only ports which are part of the same vlan can talk to each other. They can not talk to ports of other vlan.
A VLAN represents a broadcast domain. VLANs are identified by a VLAN ID (a number between 0 – 4095), with the default VLAN on any network being VLAN 1. Each port on a switch or router can be assigned to be a member of a VLAN (i.e., to allow receiving and sending traffic on that VLAN). For example: on a switch, traffic that is sent to a port that is a member of VLAN 100, may be forwarded to any other VLAN 100 port on the switch, and it can also travel across a trunk port (connections between switches) to another switch and forwarded to all VLAN 100 ports on that switch. Traffic won't, however, be forwarded to ports that are on a different VLAN ID.
In order to implement VLANs, the routers and switches must support VLANs. Although there are several proprietary protocols in existence, the most commonly used protocol for configuring VLANs is IEEE 802.1Q. Switches that support VLANs are often called "Managed" switches,
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