求翻译这段话 谢谢本文介绍了交换式核心设备---交换机的优点和它的转发方式,并在此基础上提出虚拟局域网（VLAN）的概念

this article introduces the kernel equipment of exchange mode---the advantige and sending method of exchange machine,and also introduces VLAN,which based on exchange machine

This introduced exchange-core switching equipment --- the advantages and its transmission mode, and on this basis to virtual LAN (VLAN) concept in the management of network and the advantages of VLAN classification. Switches, bridge, switched Ethernet, virtual LAN