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Exam N10-009 topic 1 question 29 discussion

Actual exam question from CompTIA's N10-009
Question #: 29
Topic #: 1
[All N10-009 Questions]

A customer needs six usable IP addresses. Which of the following best meets this requirement?

  • A. 255.255.255.128
  • B. 255.255.255.192
  • C. 255.255.255.224
  • D. 255.255.255.240
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Suggested Answer: D 🗳️

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kinkistyle
2 months, 1 week ago
Selected Answer: D
The ideal mask would be 255.255.255.248 which would give us exactly the right amount of usable addresses at 6, but the next best is D. with 14 usable address
upvoted 3 times
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Philco
2 months, 2 weeks ago
Selected Answer: C
Since you need 6 IP addresses, the closest power of 2 that can accommodate that is 2^3 (which equals 8), meaning you need 3 host bits
upvoted 1 times
Philco
2 months ago
sorry , 2nd thoughts I am wrong the correct answer would have been 255.255.255.248 since it is not available --- the next best one is D
upvoted 1 times
Philco
1 month, 4 weeks ago
Subnet Masks Avail.- IP's Networks Cidr 255.255.255.252 4-2 64 /30 255.255.255.248 8-2 32 /29 255.255.255.240 16-2 16 /28 255.255.255.224 32-2 8 /27 255.255.255.192 64-2 4 /26 255.255.255.128 128-2 2 /25 255.255.255.0 256-2 1 /24
upvoted 1 times
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ba10f26
3 months, 2 weeks ago
Selected Answer: D
Correct Answer: D 255.255.255.240 provides 14 usable IP addresses, which is more than enough for the 6 usable IPs the customer needs. This option is more efficient compared to 255.255.255.224, which provides 30 usable IPs and would waste a larger number of addresses.
upvoted 1 times
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Powerserg28
3 months, 3 weeks ago
Selected Answer: D
255.255.255.240 = 11111111.1111111.1111111.11110000 Number of networks = 2^n; n = on bits (1); 2^4 = 16 Number of host = (2^n) - 2; n = off bits (0); (2^4) - 2 = 14
upvoted 3 times
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S1vu
4 months, 3 weeks ago
Selected Answer: D
255.255.255.240 (Option D) is the most efficient choice, as it provides 14 usable addresses, which meets the requirement without wasting too many additional addresses.
upvoted 1 times
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S1vu
4 months, 3 weeks ago
Correct answer is D (14 addresses), It is the closest to 6 usable IP addresses without wasting any additional addresses
upvoted 1 times
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BobbyCruz111
4 months, 3 weeks ago
Selected Answer: C
The subnet mask 255.255.255.224 (option C) provides 6 usable IP addresses, which is exactly what the customer needs. 255.255.255.240 (option D) provides 14 usable IPs, which is more than needed. So, C. 255.255.255.224 is the best answer for 6 usable IP addresses.
upvoted 2 times
Army_Germ
4 months, 1 week ago
C provides 6 networks not usable addresses.
upvoted 1 times
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ilikeyou
4 months, 2 weeks ago
Wrong-Option C /27 provides 30 usable hosts. However, /29 provides exactly 6 usable host addresses, which is not an option here. Therefore option D is correct.
upvoted 1 times
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chupapi_001
5 months ago
Selected Answer: D
Since the customer needs 6 usable IP addresses, we should choose the smallest subnet that can accommodate this requirement while minimizing wasted addresses. 255.255.255.240 provides 14 usable addresses, which is the closest match to the requirement of 6 addresses.
upvoted 1 times
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C (25%)
B (20%)
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