Exam N10-009 topic 1 question 340 discussion

Actual exam question from CompTIA's N10-009

Question #: 340
Topic #: 1

A customer calls the help desk to report issues connecting to the internet. The customer can reach a local database server. A technician goes to the site and examines the configuration:

Which of the following is causing the user's issue?

A. Incorrect DNS
B. Unreachable gateway
C. Failed root bridge
D. Poor upstream routing

Show Suggested Answer

Suggested Answer: B 🗳️

by Alyssaleeb at May 9, 2025, 3:10 a.m.

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MATM2023

1 month ago

Selected Answer: B

Subnet: 192.168.1.0 - 63 192.168.1.64-127 192.168.1.128-192 192.168.1.192-223 .... IP address in one subnet and Gateway in another subnet. :-)

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MATM2023

1 month ago

sorry. 192.168.1.192-255 so IP address .223 in one subnet and Gateway .190 in another subnet

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Jstark111

1 month, 2 weeks ago

Selected Answer: B

Default Gateway: 192.168.1.190 → This IP is outside the subnet (it belongs to the 192.168.1.128/26 range), so the device cannot reach the gateway.

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Alyssaleeb

1 month, 2 weeks ago

Selected Answer: A

The answer is incorrect DNS. If the customer can access local network resources (like a database server on the same network), it means: The gateway is reachable (so not B). The LAN switching is functioning, so no issue with the root bridge (not C). The internet may be accessible, but DNS resolution is failing—the user can’t turn "google.com" into an IP address.

upvoted 1 times

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