and mobile stations QUESTION 32 In WLAN a distribution system connects O APs in the same BSS APs in the same ESS Stations connected to the same AP o Stations are not connected to the AP but can hear each other QUESTION 33 CSMA/CA can avoid al collisions because all stations cooperatively check whether the medium is busy before transmission True O False QUESTION 34 In which of following, there is no contention in 802.11 network? O DCF mode OPCF mode Infrastructure mode O Ad hoc mode QUESTION 35 in CSMA/CA, a station that is waiting to transmit will sense the medium on the channel being used and wait until the medium is free of other transmissions. If the medium was busy and then once the medium becomes free, It will transmit immediately It will wait for DIFS and then transmit It will wait for DIFS and a random back-off time before transmit It will wait for the time of duration field of previous frame has expired QUESTION 36 The slot time of contention window of CSMA/CA is different for 802.11a and 802.116 True O False