Q: 14
An AP is receiving 802.11 packets on its 802.11a radio with an RSSI value of -77 dBm. The current AP
is part of an AP group that has been assigned an RF profile with RX-SOP set to Medium for 802.11
a. Which action does the AP take with the packets?
Options
Discussion
Option D. With RX-SOP set to Medium for 802.11a, -77 dBm is still above the default rejection threshold, so the AP's 5 GHz radio would decode those frames. Pretty sure that's how Cisco implements it unless the profile got tweaked. Let me know if you saw custom thresholds on your exam.
Option A Had something like this in a mock and I picked A because I thought frames that weak weren't decoded, but now I'm not so sure. Medium RX-SOP sounded strict enough to filter out -77 dBm, at least in those labs.
C/D? I don't think it's A-Medium RX-SOP typically uses -80 dBm as the cut, so -77 dBm packets will still be decoded by the 5 GHz radio (D). Some people mix up custom thresholds, but unless specified, standard profile applies. Agree?
A , I remember reading in the official guide that if RX-SOP Medium was set stricter in a profile, weak frames like -77 dBm could be classified as non-Wi-Fi and ignored. Labs and exam reports mention similar cases.
I don't think it's A or C, those are the typical distractors when RX-SOP filtering is more aggressive. Since Medium usually ignores anything weaker than around -80 dBm, -77 dBm would still get decoded by the 5 GHz radio (802.11a). So D makes sense here. If RX-SOP was set stricter, it might be different, but that's not the case. Open to correction if I'm missing something!
Looks like it’s D. RX-SOP Medium usually filters out weaker signals but -77 dBm should still be strong enough for the AP to decode on the 5 GHz (802.11a) radio. Saw a similar question in some exam reports.
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