VLANs Defined
A VLAN is defined as a broadcast domain within a switched network. Broadcast domains describe the extent that a network propagates a broadcast frame generated by a station. Some switches may be configured to support a single or multiple VLANs. Whenever a switch supports multiple VLANs, broadcasts within one VLAN never appear in another VLAN. Switch ports configured as a member of one VLAN belong to a different broadcast domain, as compared to switch ports configured as members of a different VLAN.
Creating VLANs enables administrators to build broadcast domains with fewer users in each broadcast domain. This increases the bandwidth available to users because fewer users will contend for the bandwidth.
Routers also maintain broadcast domain isolation by blocking broadcast frames. Therefore, traffic can pass from one VLAN to another only through a router.
Normally, each subnet belongs to a different VLAN. Therefore, a network with many subnets will probably have many VLANs. Switches and VLANs enable a network administrator to assign users to broadcast domains based upon the user's job need. This provides a high level of deployment flexibility for a network administrator.
Advantages of VLANs include the following:
Segmentation of broadcast domains to create more bandwidth
Additional security by isolating users with bridge technologies
Deployment flexibility based upon job function rather than physical placement
參考答案:VLAN的定义,是指一个局域网广播域网内切换. 广播域描述范围内的广播网络传递产生了站. 有些交换机可配置VLAN的支持单一或多重. 支持多VLAN的交换机时,VLAN的广播,从未出现在另一个局域网. 交换机配置身为一个港口属于不同的VLAN广播域 口岸开关相比配置不同的VLAN的成员. 创建VLAN的广播域建立使管理者与每个用户少播域. 这是因为增加的带宽可供使用者少用户将争夺带宽. 路由器还保持广播域隔离阻挠广播帧. 因此,交通是可以通过从一个局域网到另一个只有通过路由器. 一般来说,每个子网属于不同的VLAN. 因此,有许多子网大概有许多VLAN的. 交换机和VLAN技术的转让,使网络管理员根据用户播放域用户的工作需要. 这提供了高水平的网络管理员部署灵活性. VLAN的好处包括: 分割广播域的带宽创造更多的附加安全,隔离用户调配桥梁技术,其部署灵活性取决于工作职能而非物理配置.
