CCNA题目

7713 · 发表于 2017-7-21 11:02:21

QUESTION 276
Assuming a subnet mask of 255.255.248.0, three of the following addresses are valid host addresses.
Which are these addresses? (Choose three.)
A. 172.16.9.0
B. 172.16.8.0
C. 172.16.31.0
D. 172.16.20.0
Correct Answer: ACD

如何得出该答案，请大神详解谢谢。

wyang9311 · 发表于 2017-7-21 12:00:24

256-248=8, 8/16/24/32/40/48/56...are Network IDs, so 9/20/30 are valid hosts

Rockyw · 发表于 2017-7-21 12:20:01

wyang9311 发表于 2017-7-21 12:00
256-248=8, 8/16/24/32/40/48/56...are Network IDs, so 9/20/30 are valid hosts

这方法不错，学习了

7713 · 发表于 2017-7-21 16:26:25

wyang9311 发表于 2017-7-21 12:00
256-248=8, 8/16/24/32/40/48/56...are Network IDs, so 9/20/30 are valid hosts

很受用的方法啊

7713 · 发表于 2017-7-21 16:26:32

wyang9311 发表于 2017-7-21 12:00
256-248=8, 8/16/24/32/40/48/56...are Network IDs, so 9/20/30 are valid hosts

很受用的方法啊

peace0917 · 发表于 2017-7-27 21:12:44

wyang9311 发表于 2017-7-21 12:00
256-248=8, 8/16/24/32/40/48/56...are Network IDs, so 9/20/30 are valid hosts

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