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Exam ANS-C00 topic 1 question 134 discussion

Exam question from Amazon's ANS-C00
Question #: 134
Topic #: 1
[All ANS-C00 Questions]

You need to create a subnet in a VPC that supports 14 hosts. You need to be as accurate as possible since you run a very large company. What CIDR should you use?

  • A. /28
  • B. /24
  • C. /25
  • D. /27
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Suggested Answer: D 🗳️
/27 supports 27 hosts since AWS reserves 5 addresses. /25 supports 123 hosts, /28 supports 11, /24 supports 251.
by Scunningham99 at Nov. 25, 2020, 7:44 a.m.
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Vlan
Highly Voted 3 years, 7 months ago
Answer is D
upvoted 5 times
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jyrajan69
Most Recent 3 years, 5 months ago
How can it be D? A /28 gives you 11 possible hosts and that seems a lot closer to 14 than any other answer
upvoted 1 times
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doski
3 years, 8 months ago
Answer is D
upvoted 2 times
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Scunningham99
3 years, 8 months ago
a a a a a a https://www.aelius.com/njh/subnet_sheet.html
upvoted 1 times
StelSen
3 years, 7 months ago
In AWS, a Subnet will reserve 5 IPs. So you can't use those.
upvoted 1 times
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ChauPhan
3 years, 7 months ago
.0 to .3 are reserved, you cannot use it
upvoted 1 times
ExtHo
3 years, 4 months ago
.0 to .3 and last ip are reserved, you cannot use it
upvoted 1 times
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liteup
3 years, 8 months ago
Don't forget the extra IP address reserved for AWS use in addition to the 14 hosts required, hence the answer should be D.
upvoted 10 times
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