220-801 Question #592: Real Exam Question with Answer & Explanation

The correct answer is B: DHCP. An IP address of 169.254.x.x is an APIPA address, indicating the device failed to receive an IP address from a DHCP server, so the DHCP service on the router should be verified.

Question

A user on a wireless network has the IP address 169.254.155.2 but cannot connect to the Internet. Which of the following should the user check on the wireless router?

Options

AWPA
BDHCP
CWINS
DDNS

Explanation

An IP address of 169.254.x.x is an APIPA address, indicating the device failed to receive an IP address from a DHCP server, so the DHCP service on the router should be verified.

Common mistakes.

A. WPA is the wireless security encryption protocol - it governs whether the client can associate with the access point, but a successful wireless association with a failed DHCP lease would still produce an APIPA address, making WPA not the root cause here.
C. WINS (Windows Internet Name Service) resolves NetBIOS names to IP addresses - it is unrelated to DHCP lease assignment and would not cause an APIPA address.
D. DNS translates hostnames to IP addresses - it operates after an IP address has already been obtained and would not cause a device to receive an APIPA address.

Concept tested. APIPA diagnosis and DHCP server troubleshooting

Reference. https://learn.microsoft.com/en-us/troubleshoot/windows-client/networking/automatic-private-ip-addressing

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