求翻译：VLAN是为解决以太网广播问题和安全性而提出，它在以太网帧基础上增加了VLAN头，用VLAN ID把用户划分为更小工作组，限制不同工作组间的用户二层互访，是什么意思？

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For VLAN Ethernet broadcast and security, it in the Ethernet frame has been added based on VLAN VLAN ID head and bring the user into a smaller working group, and limits are different between the groups of users, and layer 2 visits

VLAN is for solves the ethernet broadcast problem and the security proposed that, it increased the VLAN head in the ethernet frame foundation, divides with VLAN ID the user into a younger work team, user two exchange visits between the limit different work team's,

VLAN is proposed to resolve Ethernet broadcast and security, which in Ethernet frames based on the VLAN headers, users with VLAN ID is divided into smaller working groups, restricted user visits of the second floor between the different working groups,

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