You are troubleshooting a client issue on a Windows laptop. The laptop can see and connect to 2.4 GHz APs, but it does not even see 5 GHz APs. While evaluating the issue, you determine that this problem is happening for all of the laptops of this model in the organization. Several other tablets connect on channel 48 and channel 52 in the same work areas. What is the likely problem?

• A.The client drivers are faulty and should be upgraded
• B.The antennas in the laptops have insufficient gain to detect the 5 GHz signals
• C.The access points are configured to disallow 5 GHz
• D.The clients are configured to use WPA and 5 GHz channels only support WPA2

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The center frequency of channel 1 in the 2.4 GHz band is 2.412 GHz (2412 MHz). What is the center frequency of channel 4?

• A.2.413
• B.2.427
• C.2.422
• D.2.417

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When a client station sends a broadcast probe request frame with a wildcard SSID, how do APs respond?

• A.After waiting a SIFS, all APs reply at the same time with a probe response.
• B.Each AP checks with the DHCP server to see if it can respond and then acts accordingly.
• C.Each AP responds in turn after preparing a probe response and winning contention.
• D.For each probe request frame, only one AP may reply with a probe response.

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Which one of the following 802.11 PHYs is more likely to be used in an industrial deployment but not likely to be used in standard office deployments?

• A.HT
• B.VHT
• C.SIG
• D.OFDM

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What security method is commonly used for VoIP handsets when the infrastructure does not support OKC or FT roaming?

• A.WPA2-Enterprise with PEAP
• B.WPA2-Enterprise with EAP-TTLS
• C.WPA2 -Personal
• D.WPA2-Enterprise with EAP-TLS

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