请看看这道NP交换的题是什么意思，求详解

az3539

Which two statements are true about recommended practices that are to be used in a local VLAN
solution design where layer 2 traffic is to be kept to a minimum? (Choose two)

A. Routing should occur at the access layer if voice VLANs is utilized. Otherwise, routing should occur at
the distributionlayer.
B. Routing may be performed at all layers but is most commonly done at the core and distribution layers
C. Routing should not be performed between VLANs located on separate switches
D. Vlans should be local to a Switch
E. Vlans should ne localized to a single switch unless voice VLANs are being utilized

答案：DB

题干也不是很明白在说什么。。求过来人指点。

junyi_de

题目的意思是如何把2层流量最小化

做法就是routed access layer设计，接入层和汇聚层之间直接跑路由协议。此做法好处就是收敛在几百毫秒内，消除了2层的生成树，并且充分利用链路带宽（如果有冗余上行链路）

唯一的缺点就是VLAN不能扩展到其他接入层交换机，只能在本地。无法满足对于有2层连通性的设计需求。

zhurx

仅帮你翻译。。
Which two statements are true about recommended practices that are to be used in a local VLAN
solution design where layer 2 traffic is to be kept to a minimum? (Choose two)
思科推荐的实际方案中哪两个陈述是正确的？用于在本地局域网内的vlan设计方案,确保二层的数据流量为最小值。
（选2个）

q466265670

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