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Exam N10-007 topic 1 question 289 discussion

Actual exam question from CompTIA's N10-007
Question #: 289
Topic #: 1
[All N10-007 Questions]

A network administrator wants to narrow the scope of a subnet to two usable IP addresses within a class C network. Which of the following is the correct CIDR notation?

  • A. 10.10.50.0/30
  • B. 172.16.20.0/30
  • C. 192.1.0.124/30
  • D. 192.168.0.192/24
  • E. 192.170.10.0/24
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by TedTheAtheist at Nov. 30, 2020, 5:59 p.m.

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BTRS
Highly Voted 3 years, 11 months ago
Key is in the question "narrow scope" and "class C". This eliminates all choices apart from ones that start with 192. Now that is the class C. For the narrow scope we want fewest available amount of ip addresses which is a /30. So given answer is correct
upvoted 8 times
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mhajbeh1
Highly Voted 4 years, 1 month ago
/30 = 4 hosts – 2 = 2 usable hosts
upvoted 5 times
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BinarySoldier
Most Recent 4 years, 1 month ago
We deduce the class of an IP address from the number in the first octet, see below [0-127].x.x.x - Class A [128-191].x.x.x - Class B [192-223].x.x.x - Class C This makes C the only correct answer from the above options
upvoted 3 times
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GingerWarrior69
4 years, 2 months ago
Everything I have ever read says that Class C private address range is 192.168.0.0 – 192.168.255.255. Can anyone tell me how 192.1.0.124 is within that range?
upvoted 2 times
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[Removed]
4 years, 4 months ago
It seems that correct answr is D. 192.168.0.192/24. IP address range for class C is: from 192.168.0.0 to 192.168.255.255 C. 192.1.0.124/30 - it is out of range for class C. D. 192.168.0.192/24 - correct answer. E. 192.170.10.0/24 - it is out of range for class C.
upvoted 4 times
[Removed]
4 years, 3 months ago
I think you're thinking about private addresses.
upvoted 3 times
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eR1csg
4 years, 3 months ago
Class C is from 192.x.x.x to 223.x.x.x with subnet mask of 255.255.255.0. So C is correct for the question. This gives 4 ip address which only 2 are usable.
upvoted 6 times
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TedTheAtheist
4 years, 6 months ago
Why is it C instead of A or B? All three are class C addresses.
upvoted 2 times
Dirkster
4 years, 6 months ago
10.x.x.x is Class A 172.x.x.x is Class B 192.x.x.x is Class C
upvoted 5 times
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