SY0-501 · Question #258
SY0-501 Question #258: Real Exam Question with Answer & Explanation
The correct answer is A: The company implements a captive portal. The thermostat receives correct network parameters and associates with the AP, but cannot reach the internet-based control system, pointing to a captive portal blocking unauthenticated access. Unlike mobile devices used by humans, IoT devices like thermostats cannot interact with
Question
After correctly configuring a new wireless enabled thermostat to control the temperature of the company's meeting room, Joe, a network administrator determines that the thermostat is not connecting to the internet-based control system. Joe verifies that the thermostat received the expected network parameters and it is associated with the AP. Additionally, the other wireless mobile devices connected to the same wireless network are functioning properly. The network administrator verified that the thermostat works when tested at his residence. Which of the following is the MOST likely reason the thermostat is not connecting to the internet?
Options
- AThe company implements a captive portal
- BThe thermostat is using the incorrect encryption algorithm
- Cthe WPA2 shared likely is incorrect
- DThe company's DHCP server scope is full
Explanation
The thermostat receives correct network parameters and associates with the AP, but cannot reach the internet-based control system, pointing to a captive portal blocking unauthenticated access. Unlike mobile devices used by humans, IoT devices like thermostats cannot interact with a browser-based captive portal login page.
Common mistakes.
- B. An incorrect encryption algorithm would prevent the thermostat from successfully associating with the AP entirely, but the question states the thermostat is already associated with the AP.
- C. An incorrect WPA2 shared key would also cause the device to fail during the association/authentication phase with the AP, not after a successful connection has already been established.
- D. If the DHCP scope were full, the thermostat would not receive the expected network parameters (IP address, gateway, DNS), but the question explicitly states that the thermostat did receive the expected network parameters.
Concept tested. Captive portal impact on IoT device connectivity
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