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N10-005 · Question #763

A technician is troubleshooting a wireless network that was setup previously. The network is a hybrid of 802.11g and 802.11n WAPs. Users are not able to view or connect to the 802.11n WAPs. Which of…

The correct answer is C. The 802.11n WAPs are using a 5 GHz frequency channel. 802.11g devices operate exclusively on 2.4 GHz and cannot see or connect to 802.11n WAPs configured for the 5 GHz band.

Network troubleshooting

Question

A technician is troubleshooting a wireless network that was setup previously. The network is a hybrid of 802.11g and 802.11n WAPs. Users are not able to view or connect to the 802.11n WAPs. Which of the following is MOST likely the cause?

Options

  • AThe 802.11g WAPs are not setup for backwards compatibility.
  • BThe 802.11n WAPs are using a 2.4 GHz frequency channel.
  • CThe 802.11n WAPs are using a 5 GHz frequency channel.
  • DThe 802.11g WAPs all have disabled SSID broadcast.

How the community answered

(61 responses)
  • A
    10% (6)
  • B
    16% (10)
  • C
    70% (43)
  • D
    3% (2)

Why each option

802.11g devices operate exclusively on 2.4 GHz and cannot see or connect to 802.11n WAPs configured for the 5 GHz band.

AThe 802.11g WAPs are not setup for backwards compatibility.

Backwards compatibility is a function of the 802.11n WAPs, not the 802.11g WAPs; the 802.11g WAPs are the legacy devices, not the ones needing to support backwards compatibility.

BThe 802.11n WAPs are using a 2.4 GHz frequency channel.

If the 802.11n WAPs were using 2.4 GHz, 802.11g devices would be able to see and connect to them, so this would not cause the described problem.

CThe 802.11n WAPs are using a 5 GHz frequency channel.Correct

802.11n WAPs support both 2.4 GHz and 5 GHz bands, but 802.11g is a 2.4 GHz-only standard. If the 802.11n WAPs are configured to broadcast only on the 5 GHz band, 802.11g devices lack the radio hardware to detect or associate with them, making them invisible to legacy clients.

DThe 802.11g WAPs all have disabled SSID broadcast.

Disabled SSID broadcast on 802.11g WAPs would hide the 802.11g networks from users, not the 802.11n WAPs, and would not explain why users cannot see the 802.11n WAPs.

Concept tested: 802.11g vs 802.11n frequency band compatibility

Source: https://standards.ieee.org/ieee/802.11n/4043/

Topics

#802.11n#802.11g#5 GHz frequency#wireless compatibility

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