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300-365 · Question #50

A network engineer must configure a 5 GHz network to allow for the greatest density of radios possible with the least amount of co-channel interference. Which configuration best fulfills this…

The correct answer is B. Set DCA to 20 MHz channels and enable Extended UNII-2 channels. Using 20 MHz channels with Extended UNII-2 enabled maximizes the number of non-overlapping channels in 5 GHz, reducing co-channel interference in high-density deployments.

Wireless Deployment

Question

A network engineer must configure a 5 GHz network to allow for the greatest density of radios possible with the least amount of co-channel interference. Which configuration best fulfills this requirement?

Options

  • ASet 802.11 h Local Power constraint to 25 dBm.
  • BSet DCA to 20 MHz channels and enable Extended UNII-2 channels.
  • CEnable Event Driven RRM in 5 GHz with a sensitivity of High, n
  • DConfigure TPC Power Threshold to -80 dBm and set interference Optimal Mode (TPCv2).

How the community answered

(52 responses)
  • A
    8% (4)
  • B
    67% (35)
  • C
    6% (3)
  • D
    19% (10)

Why each option

Using 20 MHz channels with Extended UNII-2 enabled maximizes the number of non-overlapping channels in 5 GHz, reducing co-channel interference in high-density deployments.

ASet 802.11 h Local Power constraint to 25 dBm.

Setting 802.11h local power constraint to 25 dBm increases transmit power, which expands cell size and increases co-channel interference rather than reducing it.

BSet DCA to 20 MHz channels and enable Extended UNII-2 channels.Correct

20 MHz channels provide up to 25 non-overlapping channels in the 5 GHz band compared to far fewer with 40 or 80 MHz bonding, maximizing channel reuse per radio. Enabling Extended UNII-2 (channels 100-144) adds more available channels, allowing more radios to operate concurrently with minimal co-channel interference in dense environments.

CEnable Event Driven RRM in 5 GHz with a sensitivity of High, n

Event-Driven RRM reacts to detected interference events dynamically but does not proactively maximize channel count or radio density.

DConfigure TPC Power Threshold to -80 dBm and set interference Optimal Mode (TPCv2).

TPC Power Threshold and TPCv2 adjust transmit power to reduce interference but do not increase the number of available non-overlapping channels needed for dense deployments.

Concept tested: 5 GHz channel planning for high-density Wi-Fi

Source: https://www.cisco.com/c/en/us/support/docs/wireless/4400-series-wireless-lan-controllers/107597-dynamic-channel-assignment-overview.html

Topics

#DCA#channel planning#co-channel interference#5GHz density

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