Exam ANS-C00 topic 1 question 258 discussion

Exam question from Amazon's ANS-C00

Question #: 258
Topic #: 1

Considering the rules of IPv4 subnetting, how many subnets and hosts per subnet are possible given the following network 192.168.130.130/28? (in this question ignore the fact that AWS reserves 5 IP addresses)

A. 8 subnets and 30 hosts per subnet
B. 16 subnets and 14 hosts per subnet
C. 32 subnets and 30 hosts per subnet
D. 8 subnets and 14 hosts per subnet

Show Suggested Answer

Suggested Answer: B 🗳️
16 subnets and 14 hosts per subnet are possible in the CIDR.
Reference:
https://en.wikipedia.org/wiki/IPv4_subnetting_reference

by eeghai7thioyaiR4 at March 17, 2021, 11:04 a.m.

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ExamTopicsFan

Highly Voted 3 years, 7 months ago

This is so confusing !! 16 /32 subnets is fine .But is it not 14 IP addresses per subnet .Per subnet just one IP address or one host only. Is it just typo the answers should have OR instead of AND ?

upvoted 7 times

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anandmmx

Highly Voted 3 years, 7 months ago

Ans: B. 16 subnets and 14 hosts per subnet /28 = 255.255.255.240 256-240 = 16-2 (removing network and broadcast) = 14 hosts /24 = 255.255.255.0 0 to 255 = 256 addresses 256/16 = 16 subnets

upvoted 7 times

JohnnyBG

3 years, 4 months ago

Where did you took the /24 from ? I mean we can't calculate the number of subnet since there's missing info.

upvoted 4 times

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sapien45

Most Recent 3 years, 3 months ago

so /28 corresponds to 16 subnets with /32 ranges or 16 -2 (broadcats and network) =14 Ip adresses

upvoted 1 times

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Akshay11

3 years, 4 months ago

Ans should be D. Given the fact that it is /28, its subnet cannot be 192.168.130.130/28. It must be 192.168.130.128/28. So if I consider they mentioned 192.168.130.130/28 as the address from the subnet then the Subnet starting will be from 192.168.130.128/28 and then it can have only 8 subnets with 14 valid IP address per subnet.

upvoted 2 times

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ChauPhan

3 years, 7 months ago

B. 16 subnets OR 14 hosts per subnet, not AND. What the question !!!!!

upvoted 2 times

jithin1234

3 years, 7 months ago

question should be number of host per subnet.

upvoted 1 times

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eeghai7thioyaiR4

3 years, 8 months ago

Ans: B. 16 subnets and 14 hosts per subnet A /28 IPv4 may contains 16 /32 subnets, or 14 IP addr (the first one is the network addr, and the last one is the broadcast addr, both of which are reserved)

upvoted 3 times

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