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3.3 LAN & VLAN
This section provides a brief description of LAN and VLAN. It also explains how to create
and modify virtual LANs which are more commonly known as VLANs.
3.3.1 Ethernet LAN
The Local Area Network (LAN) can be used to share data or files among computers attached to a
network. Following diagram illustrates the network that wired and interconnects computers.
3.3.3 VLAN
The VLAN is a logical network under a certain switch or router device to group lots of client hosts
with a specific VLAN ID. This device supports both Port‐based VLAN and Tag‐based VLAN. In Port‐
based VLAN, all client hosts belong to the same group by transferring data via some physical ports
that are tagged with same VLAN ID in the device. The ports of a VLAN form an independent traffic
domain in which the traffic generated by the nodes remains within the VLAN. However, in Tag‐
based VLAN, all packets with same VLAN ID will be treated as the same group of them and own
same access property and QoS property. It is especially useful when individuals of a VLAN group
are located at different floor location.
The VLAN function allows you to divide local network into different "virtual LANs". In some cases,
ISP may need router to support "VLAN tag" for certain kinds of services (e.g. IPTV) to work
properly. In some cases, SMB departments are separated and located at any floor of building. All
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