A network administrator is conducting a post-deployment audit of a retail store's wireless… — CompTIA Network+

A network administrator is conducting a post-deployment audit of a retail store's wireless network following complaints of poor performance. The site survey reveals high packet retransmission rates and severe degradation on the $2.4\text{ GHz}$ spectrum. Upon examining the access point (AP) configurations, the administrator discovers that three neighboring APs operating with $20\text{ MHz}$ channel widths are configured on channels 1, 4, and 9, respectively. Which modification to the channel configuration plan will best eliminate adjacent channel interference (ACI)?

Reconfigure the three access points to use channels 1, 6, and 11.Cevap
B
Reconfigure the three access points to use channels 1, 2, and 3.
C
Enable $40\text{ MHz}$ channel bonding across channels 1 and 4 to increase overall throughput.
D
Consolidate all three access points to operate on channel 6 simultaneously.

Cevap

Reconfigure the three access points to use channels 1, 6, and 11.

In the

2.4\text{ GHz}

ISM band, standard

20\text{ MHz}

Wi-Fi channels require

25\text{ MHz}

of center-frequency separation to avoid spectral overlap. Channels 1, 6, and 11 are the only three non-overlapping channels available in standard deployment domains. Configuring neighboring access points on channels 1, 6, and 11 ensures clean signal separation and eliminates adjacent channel interference.

Adım Adım Çözüm

Analyze the current wireless spectrum configuration.

The APs are assigned to

2.4\text{ GHz}

channels 1, 4, and 9 with

20\text{ MHz}

channel widths.

In the

2.4\text{ GHz}

Wi-Fi band, channel numbers are spaced

5\text{ MHz}

apart, while each standard channel spans

22\text{ MHz}

(or

20\text{ MHz}

active width).

Identify the cause of interference.

Channels 1, 4, and 9 overlap with each other (specifically 1 and 4 overlap), causing adjacent channel interference (ACI), which corrupts packets and increases retransmissions.

Adjacent channel interference occurs when overlapping frequencies from neighboring transmitters distort signals.

Select the standard non-overlapping channel scheme for

2.4\text{ GHz}

Reassigning the access points to channels 1, 6, and 11 provides maximum spectral separation with zero channel overlap.

Channels 1, 6, and 11 are the industry standard non-overlapping channels in the

2.4\text{ GHz}

ISM band.

Anahtar Kavram

2.4 GHz Non-Overlapping Channel Planning

Soru

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Konular

Bu konudan daha fazla soru