一道經典的CCNA考題
The switches in the diagram are each installed on a different floor.Each PC has a dedicated switch port.PCs 1,2,3,4 and 5 each belong to users in the sales department.What would be the most effective solution that will limit the propagation of broadcasts from these hosts and secure their communications.The solution should allow for ease of management,troubleshooting and scalability.
A.Create a Sales VLAN on each of the switches and assign the ports connected to PCs 1,2,3,4 and 5 to that VLAN
B. Create a Sales VPN and use VTP across the trunk links of the switches to propagate membership to PCs 1,2,3,4 and 5
C. Move PCs 1,2,3,4 and 5 to the 3rd floor,and disconnect the 3rd floor switch from the rest of the LAN
D. Replace the switches with routers and use ACLs to control traffic between hosts
Select the 1 best answer
在交換機的圖表中，每個交換機都不在同一層，每臺PC機都連接在交換機的端口上面，如圖PC機1。2。3。4。5都是銷售部門的電腦，有什么解決方案可以隔離廣播和提高網絡通訊安全，這個解決方案要有容易管理，排錯和較高的可行性。
CCNA考題解答：
在如上的四種方法中最好的方法是利用vlan技術。如果在交換機中使用vlan技術，不需要改變網絡的拓撲結構和交換設備，也可以達到隔離廣播和提高網絡通訊安全的要求，同時也有很高的可行性。所以選擇A。
vlan的介紹：英文Virtual Local Area Network的縮寫，中文名為"虛擬局域網".
VLAN是一種將局域網(LAN)設備從邏輯上劃分(注意，不是從物理上劃分)成一個個網段(或者說是更小的局域網LAN)，從而實現虛擬工作組(單元)的數據交換技術。
希望這道CCNA考題能夠讓大家掌握vlan技術的作用。
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