(VLAN is the abbreviation of Virtual Local Area Network in English. It is called virtual local area network in Chinese. VLAN is a way to logically distinguish (note, not physically) a local area network (LAN) device into network segments (or smaller local area networks). LAN), and then realize the data exchange technology of virtual office group (unit). This new technology of VLAN is mainly used in switches and routers, but the mainstream use is still in switches. However, not all switches have this function, only switches above three layers have this function.)
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