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?
A.
The company implements a captive portal
B.
The thermostat is using the incorrect encryption algorithm
C.
the WPA2 shared likely is incorrect
D.
The company’s DHCP server scope is full
Explanation:
I disagree choice C because the other wireless mobile devices connected to the same wireless network are functioning properly. If the WPA2 shared likely is incorrect, then no device can connects to the wireless AP.
I am not wireless thermostat expert and I am not sure the thermostat is using what kind of encryption algorithm? I found few interesting articles. It shows incorrect encryption algorithm would make the thermostat NOT working. Keep in mind, the thermostat works in his house, so I assume it is NOT the right answer.
https://www.reddit.com/r/Nest/comments/2xx28z/nest_thermostat_wont_connect_to_wireless_if/
http://security.stackexchange.com/questions/42396/honeywell-wifi-thermostat-security
The question did not specify the thermostat is using static or dynamic IP. Well, if it is using dynamic IP, the company’s DHCP server scope is full definitely makes the thermostat is not connecting to the internet. It is possible but may not be the MOST likely reason.
Finally, the company implements a captive portal. I worked in many large companies and it is possible, especially it is in a company’s meeting room. It allows the visitors login to FREE Wi-Fi of the company. Personally, I would pick choice A be my answer.
http://searchmobilecomputing.techtarget.com/definition/captive-portal
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I agree. The captive portal would make hooking the thermostats into the network more difficult. The WPA2 cannot be accurate since we see the expected network parameters and is associate with the AP.
It must be A
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“Joe verifies that the thermostat received the
expected network parameters and it is associated with the AP” – It’s not D, DHCP did his job.
B and C is not def.
I will pick A.
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I think the answer is B, what if the thermostat is configured for WEP or WPA? If that were the case then it would not properly communicate. Most wireless mobile devices do not connect using a captive portal and they are working.
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