VLANs are most commonly segment- or port- based,requiring network administrators to define manually VLAN associations that form broadcast domains based on organizational functions rather than accidents of physical location or IP address assignment.

• VLAN最常见的是基于网段或端口，需要网络管理员人工定义VLAN的关联性，这构成了基于组织功能的广播域，而不是基于物理位置或IP地址分配的偶然性。