摘要:摘要: VLAN（Virtual Local Area Network，虚拟局域网）是一种将局域网设备从逻辑上划分成一个个网段，从而实现虚拟工作组的新兴数据交换技术。这一新兴技术主要应用于交换机和路由器中，但主流应用还是在交换机之中。将局域网按照职能和需求划分为多个广播域，VLAN之间的广播报文相互不可达，实现VLAN间相互不影响。

　　DHCP(Dynamic Host Configuration Protocol ，动态主机分配协议)是一种简化主机IP地址分配管理的TCP/IP标准协议，用户可以利用DHCP服务管理实现动态的IP地址分配及其他相关环境配置工作（如DNS、WINS、Gateway的设置等），实现简化用户的操作复杂度。

关键字：虚拟局域网； 动态主机分配协议； 地址解析协议

Abstract:Abstract : VLAN （Virtual Local Area Network）is a emerging data exchange technology to enable virtual work groups through dividing a logical LAN device into a network segment. The new technology is used in switch and router ,but most of them are used in switch . The LAN is divided into several broadcast domains ,  the broadcast message of the VLANS can not through each other . There is no influence between each VLAN . 

DHCP (Dynamic Host Configuration Protocol) is a kind of TCP/IP to simplify the administration of the IP address . The guest can use DHCP server to dynamic assigned the IP address and other configuration (for example DNS , WINS and Gateway ) , to simplify the complex degree of the guest .

Key words：VLAN； DHCP； NAT