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Exam 200-150 topic 1 question 65 discussion

Actual exam question from Cisco's 200-150
Question #: 65
Topic #: 1
[All 200-150 Questions]

How many IP address ranges are specified in RFC 1918?

  • A. 1 in Class A, 2 in Class B, and 4 in Class C
  • B. 2 in Class A, 4 in Class B, and 8 in Class C
  • C. 4 in Class A, 8 in Class B, and 16 in Class C
  • D. 1 in Class A, 16 in Class B, and 256 in Class C
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Suggested Answer: D 🗳️
http://tools.ietf.org/html/rfc1918

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snapper
5 years, 10 months ago
This is not right. There are only three RANGES specified in RFC 1918: 10.0.0.0 - 10.255.255.255 (10/8 prefix) 172.16.0.0 - 172.31.255.255 (172.16/12 prefix) 192.168.0.0 - 192.168.255.255 (192.168/16 prefix)
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DimS
5 years, 10 months ago
From RFC1918: We will refer to the first block as "24-bit block", the second as "20-bit block", and to the third as "16-bit" block. Note that (in pre-CIDR notation) the first block is nothing but a single class A network number, while the second block is a set of 16 contiguous class B network numbers, and third block is a set of 256 contiguous class C network numbers.
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snapper
5 years, 10 months ago
Can someone explain what this is really asking and how they came up with the answer? To me there are just three ranges (one for each class). Not understanding this one.
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BlueYeti
5 years, 6 months ago
It has to do with the number of 'blocks' in each range. Class 1 only includes the one, the Class B range includes 16 'Class B' subnets, and the Class C range includes 256 'Class C' subnets.
upvoted 1 times
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