CWAP Assessment Test questions with correct answers

Which of the following are two terms that effectively describe the same item? Answer MPDU & PSDU The PLCP Service Data Unit (PSDU) is a mirror of the MPDU from the other side. The MAC layer refers to an 802.11 frame as the MPDU, while the Physical layer refers to this same 802.11 frame as a PSDU. When a packet is passed down from the Network layer to the Data-Link layer for transmission, what is the default maximum size of the MSDU? Answer 2,304 bytes A client STA is part of a BSS and is building an 802.11 frame to be transmitted to another client STA in the same BSS. When this frame is created and transmitted to the AP, how many address fields will it contain? Answer An 802.11 frame has up to four address fields. In most instances, only three address fields are actually needed. What data rate and modulation can be used to transmit the Short PLCP Header? Answer Like the Long PLCP, the short PLCP Preamble is transmitted using DBPSK; however, the Short PLCP Header is transmitted using 2Mbs Differential Quadrature Phase Shift Keying (DQPSK). Although Clause 19 devices support data rates of 6, 9, 18, 24, 36, 48 and 54 Mbps, the standard requires them to support only three data rates. What are those three rates? Answer 6, 12, 24. The mandatory PHYs are ERP-OFDM and ERP-DSSS/CCK. Layer 2 retransmissions occur when frames become corrupted. What are some of the causes of layer 2 retries? Answer -Multipath -Low SNR -RF Interference -Adjacent Cell Interference (Not co-channel Interference).