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?

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.

APIPA (169.254.0.0/16) is assigned automatically when a client cannot contact a DHCP server. The wireless router typically acts as the DHCP server for home networks - if DHCP is disabled, misconfigured, or has exhausted its address pool, clients will self-assign an APIPA address and be unable to reach the Internet or other network resources.

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.

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.