CompTIA Security Plus Mock Test Q556

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.


Correct Answer: D
Section: Threats and Vulnerabilities

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