A user of the wireless network is unable to gain access to the network. The symptoms are:
1.) Unable to connect to both internal and Internet resources
2.) The wireless icon shows connectivity but has no network access
The wireless network is WPA2 Enterprise and users must be a member of the wireless security group to
authenticate. Which of the following is the MOST likely cause of the connectivity issues?
A.
The wireless signal is not strong enough
B.
A remote DDoS attack against the RADIUS server is taking place
C.
The user’s laptop only supports WPA and WEP
D.
The DHCP scope is full
E.
The dynamic encryption key did not update while the user was offline
The answer is C and not A
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This is a horrible answer. The question itself is incomplete and unclear.
Example 1: Did that user ever successfully connect to the wireless network? If the answer is yes, then we can eliminate choice C. If no, choice C could be a correct answer.
Example 2: The question mentions the user is unable to connect to both internal and Internet resources. How about access network drive? If yes, then we can eliminate choice A.
Example 3: Another user who shows up after the user with his/her laptop. If that user cannot connect to the wireless network, then choice D is right too.
I use the term “bad luck” if you see this kind of question on the real exam. The chance to get it right is depends on your luck, not based on the skill.
My first attempt is picking choice C because when I see “WPA” and “WEP”, it makes me think of “wireless” immediately. In fact, the wireless icon shows connectivity (it means you receive the wireless signal, so choice A is definitely wrong) but has no network access (most likely is an authentication issue or the DHCP scope is full). I will pick choice D if it is a real world situation (I experienced this problem at work last month). Since it is an exam, not real world situation, I will pick choice C be my final answer.
For your reference: Choice B would also make this problem happens because the RADIUS server is not able to authenticate during the attack. However, it is NOT the most likely cause.
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One last point I want to add: This question specifies “The wireless network is WPA2 Enterprise”. We know WPA2 is NOT backward compatible with WEP or WPA. So the possibility of choice C being the correct answer is higher than other choices. Hope we are not seeing this kind of unclear question on the real exam.
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WPA2 still supports TKIP for backwards-compatibility with WPA. And WPA is backward compatible with WEP because they both use RC4.
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So if the user laptop only supports WEP *and* WPA => laptop supports WPA => WPA2 backwards-compatible with WPA => C can’t be the answer.
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Lake, I appreciate your take on these. I would have to go with C as well.
the DHCP scope issue would prevent access to external but not necessarily internal resources. Signal is not strong enough but we have connectivity–just no network access.
DDoS attacks against the RADIUS server –thats interesting if tough to do. The key is just stupid.
The only real info is WPA2 Enterprise meaning a fairly complicated backend authentication system. This does seem to jump on the lack of backward compatibility.
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Answer is C
A is a horrible answer indeed ;-b
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C
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The answer appears indeed to be C-The user’s laptop only supports WPA and WEP . WPA2 Enterprise might be backward compatible to WPA and WEP, but the same does not apply the other way around. Also, since the “wireless icon shows connectivity”, it cannot be DHCP.
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