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EC-Council

312-50V13 · Question #556

A new wireless client is configured to join a 802.11 network. This client uses the same hardware and software as many of the other clients on the network. The client can see the network, but cannot…

The correct answer is A. The WAP does not recognize the client's MAC address. MAC Address Filtering Explanation Option A is correct because Wireless Access Points can be configured with MAC address filtering, which creates an allowlist of permitted devices. Since the WAP is receiving the association requests but simply not responding, it is actively…

Submitted by jakub_pl· Mar 6, 2026Hacking Wireless Networks

Question

A new wireless client is configured to join a 802.11 network. This client uses the same hardware and software as many of the other clients on the network. The client can see the network, but cannot connect. A wireless packet sniffer shows that the Wireless Access Point (WAP) is not responding to the association requests being sent by the wireless client. What is a possible source of this problem?

Options

  • AThe WAP does not recognize the client's MAC address
  • BThe client cannot see the SSID of the wireless network
  • CClient is configured for the wrong channel
  • DThe wireless client is not configured to use DHCP

How the community answered

(55 responses)
  • A
    76% (42)
  • B
    13% (7)
  • C
    4% (2)
  • D
    7% (4)

Explanation

MAC Address Filtering Explanation

Option A is correct because Wireless Access Points can be configured with MAC address filtering, which creates an allowlist of permitted devices. Since the WAP is receiving the association requests but simply not responding, it is actively ignoring the client - a classic sign of MAC filtering blocking an unrecognized device, even when the hardware/software matches other clients on the network.

Why the distractors are wrong:

  • B is incorrect because the client can already see the network, meaning the SSID is visible and not hidden
  • C is incorrect because if the client were on the wrong channel, it wouldn't be able to see the network or successfully send association requests to the WAP in the first place
  • D is incorrect because DHCP configuration is an IP-layer concern that only becomes relevant after a successful wireless association - it has no bearing on the association process itself

Memory Tip: Think of MAC filtering as a VIP list at a club door - the bouncer (WAP) sees you trying to get in (receives your request) but ignores you completely because your name isn't on the list. If you couldn't find the club, that would be an SSID problem; if you showed up at the wrong address, that would be a channel problem.

Topics

#Wireless Networks#802.11#MAC Filtering#Network Troubleshooting

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