Cwap <Chapter 1> <1Of3>

Front 1

The ISO is responsible for creating what ?

Back 1

Open System Interconnection (OSI) Model

Front 2

The (OSI) model stands for what?

Back 2

Open Systems Interconnection (OSI) model

Front 3

The 802.11-2007 standard defines communications mechanisms at what (2) layers ?

Back 3

1) Physical

2) MAC sublayer of the Data Link Layer

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Front 4

*** STATEMENT **

Back 4

By design the 802.11 standard does not address the upper layers of the OSI model.

Exception: There are interactions between the MAC sublayer and upper layers for (QOS)

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Front 5

If wireless encryption is implemented, what layers of the of the OSI model are protected?

Back 5

Layers 3 - 7

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Front 6

If wireless encryption is used, does it encrypt Layer 2 data ?

YES / NO ?

Back 6

NO

Only layers 3 -7 are encrypted.

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Front 7

What is the main objective of 802.11 communications ?

Back 7

Transfer data from one computing device to another.

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Front 8

At layer 3 what is 'data' called or referenced as?

Think data type ...

Back 8

Layer 3 -- IP PACKET

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Front 9

A bit is a binary digit, taking a value of what ?

Back 9

0 (zero) or 1 (one)

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Front 10

A byte of information comprises how many bits?

Back 10

8

8 bits make 1 byte

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Front 11

Data Link Layer is what layer of the OSI model ?

Back 11

Data Link Layer is Layer 2 of the OSI model

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Front 12

Data Link Layer has how many sublayers ?

Back 12

Data Link Layer has 2 sublayers.

LLC Logical Link Control
MAC Media Access Control

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Front 13

Name the sublayers of the Data Link Layer of the OSI model ?

Back 13

LLC Logical Link Control
MAC Media Access Control

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Front 14

LLC Logical Link Control is part of what layer of the OSI model ?

Back 14

Data Link Layer

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Front 15

The MAC Media Access Control is part of what OSI layer ?

Back 15

Data Link Layer


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Front 16

When traffic is passed down the OSI model from layer 3 <IP PACKET>, what is the next Layer / Sublayer the data gets handed off to ?

Back 16

Data Link Layer - Sublayer LLC Logical Link Control


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Front 17

When the IP packet is handed off from Layer 3 to Layer 2, what is this data called ?

Back 17

When the data hits the LLC sublayer, it is then called a MSDU <MAC SERVICE DATA UNIT>


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Front 18

The MSDU <MAC SERVICE DATA UNIT> contains what type of data ?

Back 18

MSDU contains data from Layers 3 - 7. It contains the IP Packet and some LLC information.


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Front 19

What does MSDU stand for ?

Back 19

<MAC SERVICE DATA UNIT>


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Front 20

Name the (3) major 802.11 frame types ?

Back 20

Management Frames
Control Frames
Data Frames

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Front 21

Do 802.11 management or control frames carry upper layer information ?

Back 21

NO

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Front 22

The 802.11-2007 standard states that the maximum size MSDU is how many bytes ?

Back 22

2,304 bytes, plus any overhead from encryption.


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Front 23

802.11 data frames (MSDU) Mac Service Data Unit are carried in what part of the 802.11 frame ?

Back 23

Frame Body

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Front 24

When the LLC (Logical Link Control) send the MSDU down to the MAC (Media Access Control), what 3 items are added to the data ?

Back 24

MAC HEADER
FRAME BODY (Contains MSDU)
FCS (Frame Check Sequence)

NOTE: Its called a MPDU at this point.

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Front 25

FCS stands for what ?

Back 25

FCS (Frame Check Sequence)

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Front 26

What is a FCS (Frame Check Sequence) ?

Back 26

Its a 32 bit CRC

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Front 27

When the MSDU (Mac Service Data Unit) is handed down from the LLC (Logical Link Control) to the MAC (Media Access Control) the MSDU is encapsulated and called what ?

Back 27

MPDU (Mac Protocol Data Unit)

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Front 28

What does MPDU stand for ?

Back 28

MPDU (Mac Protocol Data Unit)


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Front 29

The MPDU (Mac Protocol Data Unit) has 3 parts to it, name them.

Back 29

MAC HEADER
FRAME BODY
FCS (Frame Check Sequence)


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Front 30

MPDU (Mac Protocol Data Unit) is also know to be called ?

Back 30

The MPDU is a 802.11 FRAME

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Front 31

The physical layer is divided into how many sublayers ?

Back 31

2

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Front 32

The physical layer is divided into 2 sublayers, name the sub layers.

Back 32

Upper portion - PLCP (Physical Layer Convergence Procedure

Lower portion - PMD (Physical Medium Dependent)

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Front 33

Name the data types as data works down the OSI model layer 2 through 1 ..

Back 33

MSDU
MPDU
PSDU
PPDU


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Front 34

Name the data types as data works up the OSI model layer 1 through 2 ..

Back 34

PPDU
PSDU
MPDU
MSDU

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Front 35

Name the data types on layer 1 and 2

Back 35

MSDU (Mac Service Data Unit)
MPDU (Mac Protocol Data Unit)
PSDU (PLCP Service Data Unit)
PPDU (PLCP Data Unit)


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Front 36

Name the sublayers that data takes going down layers 2 through 1.

Back 36

LLC
MAC
PLCP
PMD


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Front 37

Name the sublayers that data takes going up layers 1 through 2.

Back 37

PMD
PLCP
MAC
LLC


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Front 38

What does PLCP stand for ?

Back 38

PLCP (Physical Layer Convergence Procedure)


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Front 39

Name the sublayers of layer 1 and layer 2.

Back 39

LLC (Logical Link Control)
MAC (Media Access Control)
PLCP (Physical Layer Convergence Protocol)
PMD (Physical Medium Dependent)


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Front 40

What 2 sublayer types are called different names but mean the same thing?

Back 40

MPDU and PSDU

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Front 41

The PLCP sublayer adds 2 things to the PSDU data when it arrives. What are they?

Back 41

Preamble and PHY Header

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Front 42

What is the purpose of a preamble?

Back 42

Preamble is used for synchronization between transmitting and receiving 802.11 radios.

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Front 43

When layer 3 sends data down to the LLC what data type is this called?

Back 43

MSDU <Mac Service Data Unit>

Front 44

Clause 16 is what type of technology ?

Back 44

IR - Infrared

Front 45

All 3 of these bands are 100 Mhz wide and offer 4 channels each. Name them

Back 45

UNII1
UNII2
UNII3

Front 46

The IEEE 802.11h amendment introduced what new unii ?

Back 46

UNII 2 - Extended

Front 47

UNII 2 Extended offers how many additional channels ?

Back 47

11

Front 48

The 802.11h amendment is an extension of what other amendment ?

Back 48

802.11a

Front 49

What is UNII 1 's starting and ending frequency range ?

Back 49

5.15 - 5.25 GHz

Front 50

What is UNII 2 's starting and ending frequency range ?

Back 50

5.25 - 5.35 GHz

Front 51

What is UNII 2-E 's starting and ending frequency range ?

Back 51

5.47 - 5.725 GHz

Front 52

What is UNII 3 's starting and ending frequency range ?

Back 52

5.725 - 5.825

Front 53

802.11g is what clause ?

Back 53

Clause 19

Front 54

Clause 19 defines a technology called what ?Hint XXX-OFDM

Back 54

ERP-OFDM

Front 55

Name the 2 mandatory ERP PHYs for clause 19 ?

Back 55

ERP-OFDM

ERP-DSSS/CCK

Front 56

Name the 8 data rates that could be supported by clause 19 ?

Back 56

6, 9, 12, 18, 24, 36, 48, 54

Front 57

Clause 19 -- ERP stands for what ?

Back 57

ERP - Extended Rate Physical

Front 58

Clause 19 -- IEEE mandates/ requires vendors support for which 3 data rates ?

Back 58

6, 12, 24

Front 59

What is the goal of the "protection mechanism" ?

Back 59

Preventing 802.11b HR-DSSS <Clause 18> and 802.11 DSSS <Clause 15> from communicating at the same time with ERP-OFDM <Clause 19>.

Front 60

Many of the past IEEE 802.11 amendments define data rates and bandwidth. 802.11n defines data rates by using what ?

Back 60

MSC - Modulation and Coding Scheme