The system administrator has been notified that many users are having difficulty connecting to the company’s wireless network. They take a new laptop and
physically go to the access point and connect with no problems. Which of the following would be the MOST likely cause?

A.
The certificate used to authenticate users has been compromised and revoked.

B.
Multiple war drivers in the parking lot have exhausted all available IPs from the pool to deny access.

C.
An attacker has gained access to the access point and has changed the encryption keys.

D.
An unauthorized access point has been configured to operate on the same channel.

Explanation:
Wireless Access Points can be configured to use a channel. If you have multiple access points within range of each other, you should configure the access points
to use different channels. Different channels use different frequencies. If you have two access points using the same channel, their wifi signals will interfere with
each other. The question states that that many users are having difficulty connecting to the company’s wireless network. This is probably due to the signal being
weakened by interference from another access point using the same channel. When the administrator takes a new laptop and physically goes to the access point
and connects with no problems, he is able to connect because he is near the access point and therefore has a strong signal.
Incorrect Answers:
A: If the certificate used to authenticate users has been compromised and revoked, no one would be able to authenticate. Users would still be able to initially

connect to the access point to start the authentication process. Therefore, this answer is incorrect.
B: The question asks for the most likely answer. Multiple war drivers in the parking lot using all the IPs is pretty unlikely. Interference from another access point is
far more likely. Therefore, this answer is incorrect.
C: If the encryption keys had been changed on the access point, no one would be able to connect to it. Therefore, this answer is incorrect.