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Cwap Exam Questions and Answers
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Cwap Exam Questions and Answers
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Cwap Questions and Answers2 sub-layers of the Data-link layer (L2) - Question and answersLLC & MAC
MSDU - Question and answersWhen L3 packet is handed to L2 the LLC header is
added it becomes Mac Service Data Unit
Max MSDU size - Question and answers2304
MPDU - Question and answersWhen MAC sublayer header is added to MSDU it
becomes Mac Protocol Data Unit — commonly called an 802.11 frame
2 sub-layers of the PHY layer(L1) - Question and answersPLCP & PMD
PLCP ( Physical Layer Convergence Procedure) - Question and answersprepares
frame for transmission by taking it from the MAC & creating the PPDU
Preamble - Question and answersadded by the PLCP (along w/ a PHY header) & used
for synchronization between Tx & Rx radios.
802.11 services are divided into 2 categories - Question and answersStation Service
(SS) & Distribution System Service (DSS)
Station Services (SS) include the following - Question and answers1. Authentication 2.
Deauthentication 3. Encryption 4. MSDU delivery 5.DFS 6.TPC 7. Higher level timer
sync 8. Qos traffic scheduling
Distribution System Service (DSS) include the following - Question and
answers1.Association 2. Reassociation 3. Disassociation 4. Distribution 5. Integration 6.
QoS traffic scheduling
Integration Service (IS) - Question and answersresponsible for transferring 802.11
frames to 802.3 (ethernet) frames
802.11b achieves higher (than prev. standard) data rates using - Question and
answersComplementary Code Keying (CCK) & modulation methods using the phase
proprties of the RF signal (as opposed to Barker Code spreading technique)
802.11b 5.5 & 11 Mbps data rates technical term - Question and answersHR-DSSS
(High Rate Direct Sequence Spread Spectrum)
, UNII Bands - Question and answers1. UNII-1 (lower) - 4 channels 2. UNII-2 (middle) - 4
channels 3. UNII-2 Extended - 11 channels 4. UNII-3 (upper) - 4 channels
802.llh - Question and answersbrought UNII-2 Extended (additional 11 channels)
2 PHY's that made 802.11g faster - Question and answersERP-OFDM &
ERP-DSSS/CCK — ERP is Extended Rate Physical
Preamble - Question and answersused by tx station to signify it's usage of the medium
& alert Rx STA of the transmission
Start Frame Delimeter field - Question and answersdirectly after the Preamble -
specifies the beginning of the frame
802.11-2007 three kinds of PLCP preambles - Question and answers1. Short 2. Long 3.
OFDM
802.11n ammendment adds what 3 Preamble types - Question and answers1. non-HT
legacy PPDU 2. HT-Mixed PPDU 3. HT-Greenfield PPDU
what is the size of the Long PLCP Preamble & what fields are in it - Question and
answers144 bit — 128bit Sync & 16bit Start Frame Delimeter
In a PLCP Preamble (long or short) what is the purose of 1. Sync Field 2. Start Frame
Delimeter - Question and answersSync - alerts Rx that a recievable signal is present.
SFD - indicates that PLCP header is coming next
what is the modulation an data-rate of the Long PLCP Preamble - Header & PSDU -
Question and answersDBPSK — 1 Mbps & variable
what is the size of the Short PLCP Preamble & what fields are in it - Question and
answers72bit — 56bit Sync & 16bit Start Frame Delimiter
what is the modulation and data-rate of the Short PLCP Preamble - Header & PSDU -
Question and answersDBPSK @ 1Mb Preamble - DQPSK @ 2Mb Header & variable
What fields are present in a Short & Long PLCP Header - Question and answersSignal -
Service - Length - CRC
What is the purpose of the Signal field in a Short/Long PLCP Header - Question and
answersindicate which modulation method used for Tx the PSDU portion of the PPDU
When a Long PLCP Header is used - what data-rates can the PSDU be sent at -
Question and answers1 - 2 - 5.5 & 11
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