A wireless network is deployed in an office area. During the experience period, customers reported that the Internet speed was slow. Which of the following cannot be the cause of this problem?

Question

Options

• AAP5G radio frequency is turned off A
• Bqos car speed limit is configured in the SSID template on the wireless controller
• CUser access uses WPA2-PSK authentication
• DSevere air interface interference

• A
  12% (3)
• B
  4% (1)
• C
  80% (20)
• D
  4% (1)

Explanation

WPA2-PSK is a security authentication method, not a bandwidth or performance mechanism. It determines who can join the network using a pre-shared key, but it does not throttle, limit, or degrade data throughput once a user is connected - making it incapable of causing slow internet speeds.

The other three options can all cause slow speeds:

• A is wrong as a "cannot" choice because disabling the 5GHz radio forces all users onto the more congested 2.4GHz band, reducing throughput.
• B is wrong because QoS CAR (Committed Access Rate) is explicitly a rate-limiting tool - configuring it directly restricts how much bandwidth users can consume.
• D is wrong because air interface interference degrades signal quality, increases retransmissions, and significantly reduces effective throughput.

Memory tip: Ask yourself - "Does this affect who gets on the network, or how fast the network runs?" Authentication methods (WPA2-PSK, WPA3, 802.1X) control access, not speed. Anything that controls bandwidth allocation, radio frequency availability, or signal quality controls performance.

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