How VLAN tagging works
VLAN Tagging is a networking technique that allows network administrators to segment a physical network into smaller, virtual networks. This technique provides better network security, flexibility, and scalability.
In simple terms, VLAN tagging works by adding a special tag to the data packets transmitted between network devices. This tag contains information about the virtual network to which the packet belongs. This way, devices can differentiate between data packets intended for their network and those intended for other networks.
When a device sends a data packet, it adds a VLAN tag to the packet header. This tag includes a VLAN ID that identifies the virtual network to which the packet belongs. The receiving device then reads the VLAN tag to determine which virtual network the packet belongs to and forwards the packet accordingly.
VLAN tagging can be implemented in two ways: using a software-based approach or a hardware-based approach.
In a software-based approach, the VLAN tagging is done by the device’s network interface card (NIC). This approach is commonly used in virtualization environments, where multiple virtual machines share the same physical network interface.
In a hardware-based approach, the VLAN tagging is done by network switches or routers. These devices have dedicated hardware that can quickly process the VLAN tags and forward packets between virtual networks. This approach is commonly used in enterprise networks, where there are many devices and a high volume of network traffic.
VLAN tagging allows network administrators to create isolated virtual networks that are separate from each other, providing an additional layer of security. It also enables network administrators to manage network traffic more effectively and allocate network resources efficiently.
In conclusion, VLAN tagging is a useful networking technique that allows network administrators to segment a physical network into smaller, virtual networks. It works by adding a special tag to data packets, which contains information about the virtual network to which the packet belongs. By using VLAN tagging, network administrators can improve network security, flexibility, and scalability.
Dave is a 20-year computer tech, systems administrator, and Geek.
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