Wireless networking is susceptible to the hidden node problem, which occurs when an STA is visible from the AP, but not from other STAs that are also communicating with the AP. This typically occurs with STAs that are at the far end of the AP's range. This leads to difficulties in media access control because the STAs cannot sense the carrier and both send packets to the AP at the same time, which results in collisions. This concept is illustrated below in Figure 9-7:
Fig. 9-7. The Hidden Node Problem
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