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[已解决] 434题 v104.4

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发表于 2012-2-13 10:31:09 | 显示全部楼层 |阅读模式

Question 434

You are working in a data center environment and are assigned the address range 10.188.31.0/23. You are asked to develop an IP addressing plan to allow the maximum number of subnets with as many as 30 hosts each.Which IP address range meets these requirements?

A. 10.188.31.0/27
B. 10.188.31.0/26
C. 10.188.31.0/29
D. 10.188.31.0/28
E. 10.188.31.0/25


Answer: A

Explanation

Each subnet has 30 hosts < 32 = 25 so we need a subnet mask which has at least 5 bit 0s -> /27. Also the question requires the maximum number of subnets (which minimum the number of hosts-per-subnet) so /27 is the best choice -> A is correct.



http://www.9tut.com/ccna-subnetting-questions-4

题库答案是B 说需要1个ip给网关...... host addresses和网关还是服务器没有关系嘛(和role无关) 所有的题里面都没单独考虑网关怎么这道题答案突然考虑网关了 其他的source都说是A 2^5=32   /27足够了      自己取舍吧.... 感觉答案是到处拼凑起来的 前面和后面的题分析的逻辑都不一致....


发表于 2012-2-13 10:38:01 | 显示全部楼层
我记得有题目是要考虑网关的。不过大部分都不考虑,特别是拖图题,全部忽略网关
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