(VLAN (VirtualLAN), translated into Chinese is "Virtual LAN". A LAN can be a network consisting of a few home computers, or a corporate network consisting of hundreds of computers. The LAN that VLAN refers to specifically refers to a network that is segmented by a router—that is, a broadcast domain. Here, let's review the concept of a broadcast domain first. The broadcast domain refers to the size that the broadcast frame (target MAC address is all 1) can be delivered to, that is, the size that can be communicated directly. Strictly speaking, not just broadcast frames, multicast frames (MulticastFrame) and unicast frames with unknown goals (UnknownUnicastFrame) can also travel unimpeded in the same broadcast domain. Originally, a Layer 2 switch can only build a single broadcast domain, but after using the VLAN function, it can cut the network into multiple broadcast domains.)
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