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Exam 98-366 topic 1 question 16 discussion

Actual exam question from Microsoft's 98-366
Question #: 16
Topic #: 1
[All 98-366 Questions]

Which subnet mask is valid?

  • A. 255.255.255.240
  • B. 255.255.255.228
  • C. 255.255.255.164
  • D. 255.255.255.245
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Suggested Answer: A 🗳️
These are valid:
by Jixxdapoy at Oct. 29, 2020, 4:22 p.m.

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CJ913
3 years, 9 months ago
1st CIDR Notation = 128. /2 = 192. /3 = 224. /4 = 240. /5 = 248. /6 = 252. /7 = 254. /8 = 255. All of the numbers above are valid subnet mask numbers they repeat after /8 into the next octect so /9 is 255.128.0.0
upvoted 1 times
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Jixxdapoy
4 years, 8 months ago
Why is it A.
upvoted 1 times
naveen81
4 years, 7 months ago
this is the way its work. if you add four numbers start from left it will be 240. So answer is A. You wont get any other option above by adding these numbers. 128.64.32.16.8.4.2.1
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Lillylafrog
1 year, 5 months ago
binary, by adding a digit the number gets considerably bigger, since masks are all 1 until the 0s not all numbers are possible, the rest get skipped
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C (25%)
B (20%)
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