(VLAN (Virtual Local Area Network), also known as virtual local area network, refers to an end-to-end logical network that can span different network segments and different networks and is constructed by using network management software on the basis of the exchange local area network. A VLAN constitutes a logical subnet, that is, a logical broadcast domain, which can cover multiple network devices and allow network users in different geographical locations to join a logical subnet. VLAN is a relatively new technology, which works in the second and third layers of the OSI reference model, and the communication between VLANs is completed through the third layer of routers.)
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