N10-009 Exam Dumps | A network engineer is troubleshooting connectivity for a newly installed server on an existing VLAN.

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CompTIA.N10-009.v2025-11-21.q147
Question 58

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Question 58/147

A network engineer is troubleshooting connectivity for a newly installed server on an existing VLAN. The engineer reviews the following output:
C:\> ipconfig
IP Address: 192.168.100.225
Mask: 255.255.255.224
Gateway: 192.168.100.254
Router# show ip route
C 192.168.100.0/24 is directly connected, GigabitEthernet0/0
Which of the following describes the issue?

A. The server has an incorrect subnet mask

B. There is a duplicate IP address on the network

C. The DHCP address pool is exhausted

D. The router is missing a default route

Correct Answer: A

The server's subnet mask is 255.255.255.224 (/27), which covers IPs from 192.168.100.224 to
192.168.100.255. However, the router only recognizes 192.168.100.0/24, indicating a mismatch between the server's subnet and the router's network.
Correct mask for the /24 network is 255.255.255.0, allowing 256 IPs from 192.168.100.0 to 192.168.100.255.
This mismatch would result in routing issues, especially with the gateway outside of the subnet range.
# Reference:
CompTIA Network+ N10-009 Official Objectives: 5.2 - Given a scenario, troubleshoot common wired connectivity issues.

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