Q: 7
In an 802.11n (H T) 2.4 GHz BSS, what prevents each station from using all the airtime when other
client stations are actively communicating in the same BSS?
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Discussion
Why are people picking C? CSMA/CD is for Ethernet, not Wi-Fi. In 802.11n BSS, it's CSMA/CA that stops everyone from transmitting at once. OFDMA is tempting but that's only in 802.11ax, not n. Just want to be sure we're not mixing up standards here.
C-I've seen similar questions in practice exams and official guides, so that sounds right to me.
D CSMA/CA keeps Wi-Fi devices from taking all the airtime. CD is Ethernet, and OFDMA isn't used in 802.11n on 2.4 GHz. Pretty sure about D, but let me know if I'm missing something.
Its C for me, since CSMA/CD deals with collisions and access control, which I thought applies. Maybe I'm mistaken and that's more for wired Ethernet, but I don't see why it can't work here too. Anyone see a catch?
Yeah, it's D. CSMA/CA controls access so clients don't just transmit over each other in 802.11n BSS. CD is Ethernet only, and OFDMA is for 11ax not n. Pretty sure this one's straightforward but open to other thoughts.
Probably D. CSMA/CA is how stations avoid clashing on the air in 802.11n BSS, not OFDMA or CD, so that's the one I'd go with. If I'm missing something, let me know.
I remember a similar scenario from labs and it was definitely D for 802.11n. CSMA/CA makes sure stations share airtime.
Not B, D. Only CSMA/CA is used in 802.11n BSS for airtime management.
Nah, not C. BSS uses CSMA/CA for collision avoidance, CSMA/CD's for Ethernet. D tbh.
Easy to forget that OFDMA (B) isn't in play till Wi-Fi 6, so for 802.11n BSS it has to be D. CSMA/CA is what actually stops clients from hogging airtime. Pretty sure on this unless I missed a weird exception in legacy specs, anyone disagree?
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