关于EIGRP 的FSWhich condition must be satisfied before an EIGRP neighbor can be considered a feasible successor?Select the best response.A.The neighbor's advertised distance must be less than or equal to the feasible distance of the current succes

关于EIGRP 的FSWhich condition must be satisfied before an EIGRP neighbor can be considered a feasible successor?Select the best response.A.The neighbor's advertised distance must be less than or equal to the feasible distance of the current succes
关于EIGRP 的FS
Which condition must be satisfied before an EIGRP neighbor can be considered a feasible successor?Select the best response.
A.The neighbor's advertised distance must be less than or equal to the feasible distance of the current successor.
B.The neighbor's advertised distance must be less than the feasible distance of the current successor.
C.The neighbor's advertised distance must be greater than the feasible distance of the current successor.
D.The neighbor's advertised distance must be equal to the feasible distance of the current successor.
E.The neighbor's advertised distance must be greater than or equal to the feasible distance of the current successor.
Answer:A 答案为什么是

关于EIGRP 的FSWhich condition must be satisfied before an EIGRP neighbor can be considered a feasible successor?Select the best response.A.The neighbor's advertised distance must be less than or equal to the feasible distance of the current succes
应该选B.
首先你要知道几个概念：
1、the feasible distance of the current successor指的是当前路由器到目标网络的距离.
2、The neighbor's advertised distance 指的是邻居到目的网络的距离.
3、feasible successor：可行后继路由器（即下一跳路由器的备份路由器）
你还需要知道路由过程,当前路由器为了把数据传到目标网络,它会把数据包转发给邻居,邻居再给下一个邻居,一直到目标网络.
问题是：当前路由器可能有很多个邻居,该转发给谁会更好?
EIGRP判断的依据是：哪个邻居到达目标网络的距离（neighbor's advertised distance ）最小的就选哪个,这个被选中作为下一跳的路由器称为后继路由器（successor）.
那到达目标网络的距离第二小的邻居怎么办呢?是不是就被抛弃了呢?
不一定!它“有可能”会成为后继路由器的备份,这样当后继路由器挂了的时候,备份的马上补上,这就是EIGRP收敛快的原因.（有些人昨天刚和老婆（后继路由器）离婚,今天又新婚,为什么这么快?因为有备份嘛.可见小三（可行后继路由器,也叫备份路由器）在这里起到了一个非常重要的作用）
注意,重点在这里,“有可能”怎么理解,要如何才能成为小三（备份路由器）,是不是谁都可以是小三?
不是的,当前路由器选择小三的条件是：你到达目标网络的距离要比我小（能理解这一点非常重要）.
在EIGRP里边,这个条件叫可行性条件.也是EIGRP用来避免路由环路的一个机制（有必要的话我再给你解答）
也就是说,到达目标网络的距离第二小的那个邻居要成为可行后继路由器（feasible successor）,条件是这个邻居到达目标网络的距离（The neighbor's advertised distance ）要比当前路由器到达目标网络的距离（the feasible distance of the current successor）要小.
写了这么多,希望对你有帮助,更希望拿到金币.一个字一个字敲是很累的,呵呵