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Exam N10-009 topic 1 question 203 discussion

Actual exam question from CompTIA's N10-009
Question #: 203
Topic #: 1
[All N10-009 Questions]

An ISP provided a company with an IP range of 98.174.235.142/28. A network technician configured a router with a subnet mask of 255.255.255.224 and default gateway of 98.174.235.129. After the configuration was set up. the company is unable to connect to the ISP. Which of the following would resolve this issue?

  • A. Change the subnet mask to .240.
  • B. Change the Ethernet cable from the external interface to the modem.
  • C. Change the CIDR to /29.
  • D. Change the static IP to 98.174.235.128/28.
Show Suggested Answer Hide Answer
Suggested Answer: A 🗳️
by TDWA2k at Feb. 3, 2025, 5:45 p.m.

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Philco
2 months, 2 weeks ago
Selected Answer: A
.240 = /28 = 16-2 IPs = 16 networks
upvoted 1 times
Philco
2 months, 2 weeks ago
Sub-Net Masks--------------Available IPs---------------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 2 times
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93831b0
2 months, 2 weeks ago
Selected Answer: D
Option A: Changing the subnet mask to .240 (which would be /23 in CIDR notation) might not resolve the issue as it alters the subnet range and could cause misaddressing of devices within the current network. Option B: Altering the Ethernet cable configuration from an external interface to a modem is unrelated to IP routing or subnetting, so this option does not address the root cause of the problem. Option C: Modifying the CIDR to /29 would move beyond the intended /28 subnets, which might be unnecessary and could lead to issues with existing networks. Option D: Changing the static IP from 98.174.235.142/28 to 98.174.235.128/28 is the most likely solution. This adjustment involves updating the specific IP address, which affects how devices are routed through the network. By changing the static IP, the company can ensure proper routing of devices within their /28 network without affecting other networks.
upvoted 1 times
93831b0
2 months ago
After revisiting thisone i take my first answer back. The ISP has given the company a /28 block so changing the subnet mask to 255.255.255.240 will align with the ISPs given block. Yes, A is the correct one.
upvoted 1 times
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TDWA2k
2 months, 3 weeks ago
Selected Answer: A
You need to change the subnet mask
upvoted 4 times
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