CCNA200-125考题求助：QUESTION 3 关于HSRP
题库答案选择AD，A正确没有问题，但是D我觉得不正确，应该选择B。QUESTION 3
What are two requirements for an HSRP group? (Choose two)
A. exactly one active router
B. one or more standby routers
C. one or more backup virtual routers
D. exactly one standby active router
E. exactly one backup virtual router
论坛里的 乾颐堂安德 和 闫辉 的讲座也都认为是只能有一个standby，其他的都是candidate。
但是我看了Cisco都官方教材和Sybex的Todd写的原版学习指南，都是说可以有多个standby。
问下大侠们，有没有对这道题的答案产生疑问的？
CCNA不会解释的那么详细，我就不摘抄了，你去找CCNP学习指南的交换部分，看看对HSRP的介绍就明白了。 多个standby的只可能是GLBP HSRP只有一个active 一个standby qzuser1 发表于 2018-10-2 14:48
多个standby的只可能是GLBP HSRP只有一个active 一个standby
那如果有第三个router处于什么状态？
希望你不是人云亦云。
给你看原文。
这是著名的Sybex的CCNA学习指南
CCNA Routing and Switching Complete Study Guide - Second Edition(Sybex - Todd Lammle)
Chapter16-page663
The problem with HSRP is that with it, only one router is active and two or more routers just sit there in standby mode and won’t be used unless a failure occurs.
这是思科官方学习指南
Cisco Official Cert Guide - Routing and Switching ICDN2 200-105
Chaper20-page551
HSRP allows two (or more) routers to cooperate, all being willing to act as the default router. However, at any one time, only one router activelysupports the end-user traffic. The packets sent by hosts to their default router flow to that one active router. Then, the other routers, with an HSRP standby state, sit there patiently waiting to take over should the active HSRP router have a problem.
当然我不排除书也可能有错，但是两本书都出错的可能性有多大？
一个Active 一个Standby {:6_299:}{:6_299:}{:6_299:} {:6_268:} IT is asking the 2 requirements for an HSRP group.So A and D are correct, because 2 (one Active, one Standby) will be sufficient for an HSRP group to be set up. {:6_267:}
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