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GCFA · Question #135

GCFA Question #135: Real Exam Question with Answer & Explanation

The correct answer is C. Change your WAP's channel.. When multiple wireless access points (WAPs) operate on the same channel within range of each other, they cause co-channel interference, which degrades performance. The solution is to change your WAP to a non-overlapping channel. For 2.4 GHz 802.11 networks, channels 1, 6, and 11

Question

You work as a Network Administrator for Tech Perfect Inc. The company has a TCP/IP-based network. You are configuring a wireless LAN on the network. You experience interference on your network. Through investigation, you come to know that three foreign WAPs are within the range of your LAN. Although they have different SSIDs than yours, they are working on the same channel as yours. Which of the following steps will you take to reduce the interference?

Options

  • AConfigure the same SSID as of the foreign networks.
  • BInstall a router on your network.
  • CChange your WAP's channel.
  • DInstall an external antenna.

Explanation

When multiple wireless access points (WAPs) operate on the same channel within range of each other, they cause co-channel interference, which degrades performance. The solution is to change your WAP to a non-overlapping channel. For 2.4 GHz 802.11 networks, channels 1, 6, and 11 are the three non-overlapping options. Since you cannot control the foreign WAPs, switching your own WAP to an unused channel eliminates the interference. Configuring the same SSID would cause association confusion, installing a router does not address RF interference, and an external antenna changes signal strength/direction but does not resolve co-channel interference.

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