Exam N10-009 topic 1 question 293 discussion

Actual exam question from CompTIA's N10-009

Question #: 293
Topic #: 1

Some of the 20 employees who use the wireless network report they are unable to access network resources even though the wireless network is available. An administrator recently made the following configuration changes to the wireless DHCP server:

Network: 192.168.100.0 -

Mask: 255.255.255.240 -

Gateway: 192.168.100.1 -

Which of the following is the cause of this issue?

A. Incorrect VLAN assignment
B. Incorrect ACL configuration
C. Incorrect subnet mask
D. Incorrect default gateway

Show Suggested Answer

Suggested Answer: C 🗳️

by UnicornFlow at May 8, 2025, 12:17 a.m.

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Cameron565606

1 month, 1 week ago

Selected Answer: C

The subnet mask 255.255.255.240 corresponds to a /28 subnet, which provides only 16 IP addresses total — with 14 usable addresses (after excluding the network and broadcast addresses). Since there are 20 employees, this subnet cannot support all of them, which explains why some users can't access network resources even though the network is available. The subnet is simply too small. The issue is not with the gateway or VLAN, and ACLs would typically affect access to resources, not DHCP address availability.

upvoted 3 times

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UnicornFlow

1 month, 2 weeks ago

Selected Answer: C

The subnet mask 255.255.255.240 allows for only 14 usable IP addresses. Since there are 20 employees using the wireless network, this subnet does not provide enough IP addresses for all users, leading to connectivity issues.

upvoted 2 times

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