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Exam N10-008 topic 1 question 39 discussion

Actual exam question from CompTIA's N10-008

Question #: 39
Topic #: 1

A branch of a company recently switched to a new ISP. The network engineer was given a new IP range to assign. The ISP assigned 196.26.4.0/26, and the branch gateway router now has the following configurations on the interface that peers to the ISP:

The network engineer observes that all users have lost Internet connectivity. Which of the following describes the issue?

A. The incorrect subnet mask was configured
B. The incorrect gateway was configured
C. The incorrect IP address was configured
D. The incorrect interface was configured

Show Suggested Answer

Suggested Answer: B 🗳️

by itssnowyseason at Feb. 10, 2022, 8:49 p.m.

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Tyrial

Highly Voted 3 years, 4 months ago

Selected Answer: B

Gateway is the correct answer. XX.XX.4.1 and XX.XX.4.30 will still be in the subnet when the mask is set to 255.255.255.224 (/27)

upvoted 37 times

Mothman619

3 years, 4 months ago

to add to this you can see that the gateway is xx.24.xx.xx as opposed to the IPs being on xx.26.xx.xx

upvoted 15 times

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stonegg

3 years, 2 months ago

And some of claim that the user can use /27 subnet mask, yes, that can be happened but check the question. It states "The network engineer observes that all users have lost Internet connectivity.". All peer's IP configuration is fine with /27 but it can't explain why all users have lost their internet connections.

upvoted 7 times

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famco

2 years, 1 month ago

That is because the range 196.26.4.0 - 196.26.4.31 which is in /27 is also in the range of 192.168.4.0/26 (which is 192.168.4.0 - 192.168.4.63). When the subnet mask is applied it will think the gateway is directly connected and will send the arp request to the gateway if the gateway was set correct.

upvoted 1 times

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kerppa

2 years ago

The question says 196.26.4.0/26 not 196.26.4.0/27. Therefore, the Subnet Mask is wrong and it won´t work as the /26 was given by the ISP and it can´t be modified.

upvoted 16 times

GL1494

1 year, 8 months ago

Totally agree with you. The Subnet mask is wrong, they need be 255.255.255.192 for /26

upvoted 11 times

GL1494

1 year, 8 months ago

I corrected myself, the gateway configuration is incorrect.

upvoted 3 times

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waqdhiyo

Highly Voted 3 years, 4 months ago

Selected Answer: A

Incorrect Subnet Mask was configured. The correct subnet mask is 255.255.255.192

upvoted 31 times

twobuckchuck

3 years, 3 months ago

Incorrect. You can use /27 even though ISP gave you a /26. The gateway however is not in the network at all

upvoted 24 times

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zuzuonyi

Most Recent 6 months, 2 weeks ago

Selected Answer: A

The issue here is with the subnet mask which should be .192 for /26 and not .224 which is for /27.

upvoted 1 times

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Crashy

7 months, 2 weeks ago

Selected Answer: A

The ISP assigned 196.26.4.0/26, which means the subnet mask should be 255.255.255.192. This subnet mask gives an IP range from 196.26.4.0 to 196.26.4.63. However, the configuration on the interface shows a subnet mask of 255.255.255.224, which corresponds to a /27 subnet. This subnet mask provides an IP range from 196.26.4.0 to 196.26.4.31.

upvoted 1 times

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Le081

9 months, 4 weeks ago

Selected Answer: A

The issue likely lies in the configuration of the subnet mask. The IP range 196.26.4.0/26 has a subnet mask of 255.255.255.192, which allows for 64 IP addresses (62 usable for hosts). If the subnet mask is incorrectly configured, it can cause connectivity issues. Here are some potential problems to check: Incorrect Subnet Mask: Ensure that the subnet mask is set to 255.255.255.192 on all devices. Incorrect Gateway Configuration: Verify that the gateway IP address is correctly set within the assigned range. IP Address Conflicts: Check for any IP address conflicts within the network.

upvoted 1 times

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JB1705

1 year ago

Selected Answer: A

Incorrect Subnet is answer /26 means 8.8.8.11000000 255.255.255.192 also /26 gives 64 ip address. ISP and client ip are within the 64 Range

upvoted 2 times

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JB1705

1 year ago

Incorrect Subnet is answer /26 means 8.8.8.11000000 255.255.255.192 also /26 gives 64 ip address. ISP and client ip are within the 64 Range

upvoted 1 times

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stanislaus450

1 year, 2 months ago

Selected Answer: B

The correct answer is B. The incorrect gateway was configured. The gateway IP address should be within the same subnet as the IP address of the interface. The subnet for the IP address 196.26.4.30 with subnet mask 255.255.255.224 (/26) is 196.26.4.0 to 196.26.4.63. However, the configured gateway IP address 196.24.4.1 is not within this range. Therefore, the gateway IP address is incorrect and needs to be reconfigured to an IP within the 196.26.4.0/26 subnet.

upvoted 1 times

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IJsbeer1

1 year, 2 months ago

I took the exam last week (on March 21, 2024) and I answered A (incorrect subnet mask). I scored 861/900. It is not answer B (incorrect gateway), because the gateway mentioned in the question was: 196.26.4.1

upvoted 7 times

Grottle68

1 year, 1 month ago

did you just study this to pass? or did you also do self studying to get that high of a score?

upvoted 1 times

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Jaeide__X

1 year, 3 months ago

Selected Answer: B

The gateway router's interface configuration includes the following information: IP address: 196.26.4.30 Subnet mask: 255.255.255.224 Gateway: 196.24.4.1 The subnet mask 255.255.255.224 corresponds to a /27 subnet, not a /26 subnet. Therefore, the correct subnet mask for the assigned IP range 196.26.4.0/26 should be 255.255.255.192, not 255.255.255.224. This misconfiguration prevents the gateway router from properly communicating with devices outside the local network, causing all users to lose Internet connectivity.

upvoted 1 times

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Bo_Knows

1 year, 3 months ago

Selected Answer: B

Clearly, the gateway is not in the ISP-provided subnet range

upvoted 1 times

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nnaaddrr

1 year, 4 months ago

both the gateway and the subnet mask are incorrect. However, the issue that directly impacts the loss of Internet connectivity for all users is the incorrect gateway configuration.Even if the subnet mask were correct, without the correct gateway, the traffic wouldn't be routed properly to reach the internet. So, while both are issues, the incorrect gateway configuration more accurately describes the immediate cause of the loss of connectivity. Therefore, option B, the incorrect gateway configuration, best describes the issue.

upvoted 3 times

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StrivingForG8ness

1 year, 5 months ago

Selected Answer: B

/30 would be ".252" not "224". Subnet Mask Is Incorrect. Google and take a look at the CIDR notation sheet

upvoted 2 times

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pinderanttal

1 year, 5 months ago

Selected Answer: A

network segment set by the ISP at their branch is /26 so the subnet mask should be the same as of the ISP and our company network. moreover, the gateway device is not the end device(router) in the company that is also handled by the ISP and of course, the rules are set by the ISP to route our company inquiries and all. (Hope, I able to explain what I want to say English is not my first language) Thanks

upvoted 2 times

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[Removed]

1 year, 5 months ago

Selected Answer: B

I typed whole question and image into BING AI: The issue is with the gateway that was configured. The gateway IP address should be within the same subnet as the IP address of the interface. In this case, the IP address of the interface is 196.26.4.30 and it falls within the 196.26.4.0/26 subnet. However, the gateway IP address 196.24.4.1 does not fall within this subnet. Therefore, the correct answer is B. The incorrect gateway was configured. The gateway should be an IP address from the 196.26.4.0/26 subnet.

upvoted 3 times

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cyberkittex

1 year, 7 months ago

Selected Answer: B

Gateway, second octet is different

upvoted 3 times

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jonmcgaw

1 year, 7 months ago

The second octet on the gateway is wrong

upvoted 2 times

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