Ccna Wireless 640-722 Study Guide

Front 1

I.- RF Singals and Modulation

bandwidth

Back 1

bandwidth

The range of frequencies used by a single channel or a single RF signal.

Front 2

I.- RF Singals and Modulation

Barker 11 code

Back 2

Barker 11 code

An 11-bit sequence of encoded bits that represent a single data bit.

Front 3

I.- RF Singals and Modulation

carrier signal

Back 3

carrier signal

The basic, steady RF signal that is used to carry other useful information.

Front 4

I.- RF Singals and Modulation

coder

Back 4

coder

A function that converts data bits into multiple encoded bits before transmission, to provide resilience against noise and interference

Front 5

I.- RF Singals and Modulation

CCK

Back 5

CCK

Complementary Code Keying

An encoding method that takes either 4 or 8 data bits at a time to create a 6-bit or 8-bit symbol, respectively. The symbols are fed into DQPSK to modulate the carrier signal.

Front 6

I.- RF Singals and Modulation

DBPSK

Back 6

DBPSK

Differential Binary Phase Shift Keying

A modulation method that takes 1 bit of encoded data and changes the phase of the carrier signal in one of two ways.

Front 7

I.- RF Singals and Modulation

DSSS

Back 7

DSSS

Direct Sequence Spread Spectrum

A wireless LAN method where a transmitter uses a single fixed, wide channel to send data.

Front 8

I.- RF Singals and Modulation

EIRP

Back 8

EIRP

Effective Isotropic Radiated Power

The resulting signal power level, measured in dBm, of the combination of a transmitter, cable, and antenna, as measured at the antenna.

Front 9

I.- RF Singals and Modulation

FHSS

Back 9

FHSS

Frequency Hopping Spread Spectrum

A wireless LAN method where a transmitter "hops" between frequencies all across a band.

Front 10

I.- RF Singals and Modulation

Link budget

Back 10

Link budget

The cumulative sum of gains and losses measured in dB over the complete RF signal path; a transmitter's power level must overcome the link budget so that the signal can reach a receiver effectively.

Front 11

I.- RF Singals and Modulation

narrow band

Back 11

narrow band

RF signals that use a very narrow range of frequencies.

Front 12

I.- RF Singals and Modulation

noise floor

Back 12

noise floor

The average power level of noise measured at a specific frequency.

Front 13

I.- RF Singals and Modulation

OFDM

Back 13

OFDM

Orthogonal Frequency Division Multiplexing

A data transmission methods that sends data bits in parallel over multiple frequencies within a single 20 MHz channel. Each frequency represents a single subcarrier.

Front 14

I.- RF Singals and Modulation

QAM

Back 14

QAM

Quadrature Amplitude Modulation

A modultion method that combines QPSK phase shifting with multiple amplitude levels to produce a greater number of unique changes to the carrier signal. The number preceding the QAM name designates how many carrier changes are possible.

Front 15

I.- RF Singals and Modulation

RSSI

Back 15

RSSI

Received Signal Strength Indicator

The measure of signal strength (in dBm) as seen by the receiver. RSSI is normally negative (0 to -100) because the received signal is always a degraded form of the original signal that was sent.

Front 16

I.- RF Singals and Modulation

Sensitivity level

Back 16

Sensitivity level

The RSSI threshold (in dBm) that divides unintelligible RF signals from useful ones.

Front 17

I.- RF Singals and Modulation

SNR

Back 17

SNR

Signal to Noise Ratio

A measure of received signal quality, calculated as the difference between the singal's RSSI and the noise floor. A higher SNR is preferred.

Front 18

I.- RF Singals and Modulation

Spread Spectrum

Back 18

Spread Spectrum

RF signals that spread the information being sent over a wide range of frequencies.

Front 19

I.- RF Singals and Modulation

Symbol

Back 19

Symbol

A complete group of encoded chips that represent a data bit.

Front 20

II.- RF Standards

block acknowledgement

Back 20

block acknowledgement

Front 21

II.- RF Standards

channel aggregations

Back 21

channel aggregations

Front 22

II.- RF Standards

GI

Back 22

GI

guard interval

Front 23

II.- RF Standards

HT

Back 23

HT

High Throughput

Front 24

II.- RF Standards

ISI

Back 24

ISI

Intersymbol Interference

Front 25

II.- RF Standards

MRC

Back 25

MRC

Maximum Radio Combining

Front 26

II.- RF Standards

protection mechanism

Back 26

protection mechanism

Front 27

II.- RF Standards

spatial stream

Back 27

spatial stream

Front 28

II.- RF Standards

TxBF

Back 28

TxBF

Transmit beamforming

Front 29

III.- RF Signals in the Real World

dynamic rate shifting

Back 29

dynamic rate shifting

Front 30

III.- RF Signals in the Real World

free path loss

Back 30

free path loss

Front 31

III.- RF Signals in the Real World

scattering

Back 31

scattering

Front 32

III.- RF Signals in the Real World

Fresnel zone

Back 32

Fresnel zone

Front 33

III.- RF Signals in the Real World

multipath

Back 33

multipath

Front 34

IV.- Understanding Antennas

beamwidth

Back 34

beamwidth

Front 35

IV.- Understanding Antennas

directional antenna

Back 35

directional antenna

Front 36

IV.- Understanding Antennas

dipole

Back 36

dipole

Front 37

IV.- Understanding Antennas

E plane

Back 37

E plane

Front 38

IV.- Understanding Antennas

integrated antenna

Back 38

integrated antenna

Front 39

IV.- Understanding Antennas

lightning arrestor

Back 39

lightning arrestor

Front 40

IV.- Understanding Antennas

monopole

Back 40

monopole

Front 41

IV.- Understanding Antennas

omnidirectional antenna

Back 41

omnidirectional antenna

Front 42

IV.- Understanding Antennas

parabolic dish antenna

Back 42

parabolic dish antenna

Front 43

IV.- Understanding Antennas

patch antenna

Back 43

patch antenna

Front 44

IV.- Understanding Antennas

polar plot

Back 44

polar plot

Front 45

IV.- Understanding Antennas

radiation pattern

Back 45

radiation pattern

Front 46

V.- Wireless LAN Topologies

ad hoc network

Back 46

ad hoc network

Front 47

V.- Wireless LAN Topologies

ESS

Back 47

Extended Service Set

Front 48

V.- Wireless LAN Topologies

infrastructure mode

Back 48

infrastructure mode

Front 49

V.- Wireless LAN Topologies

point-to-point bridge

Back 49

point-to-point bridge

Front 50

V.- Wireless LAN Topologies

workgroup bridge

Back 50

workgroup bridge

Front 51

VI.- Understanding 802.11 Frame Types

active scanning

Back 51

active scanning

Front 52

VI.- Understanding 802.11 Frame Types

association

Back 52

association

Front 53

VI.- Understanding 802.11 Frame Types

backoff timer

Back 53

backoff timer

Front 54

VI.- Understanding 802.11 Frame Types

BSS basic rate

Back 54

BSS basic rate

Front 55

VI.- Understanding 802.11 Frame Types

CCA

Back 55

Clear Channel Assesment

Front 56

VI.- Understanding 802.11 Frame Types

collision avoidance

Back 56

collision avoidance

Front 57

VI.- Understanding 802.11 Frame Types

contention window

Back 57

contention window

Front 58

VI.- Understanding 802.11 Frame Types

DTIM

Back 58

DTIM

Delivery Traffic Indication Message

Front 59

VI.- Understanding 802.11 Frame Types

DCF

Back 59

DCF

Distributed Coordination Function

Front 60

VI.- Understanding 802.11 Frame Types

interframe space

Back 60

interframe space

Front 61

VI.- Understanding 802.11 Frame Types

NAV

Back 61

NAV

Network Allocation Vector

Front 62

VI.- Understanding 802.11 Frame Types

Open System Authentication

Back 62

Open System Authentication

Front 63

VI.- Understanding 802.11 Frame Types

TIM

Back 63

TIM

Traffic Indication Map

Front 64

VI.- Understanding 802.11 Frame Types

U-APSD

Back 64

U-APSD

Unscheduled automatic power save deliver

Front 65

VI.- Understanding 802.11 Frame Types

virtual carrier sense

Back 65

virtual carrier sense

Front 66

VI.- Understanding 802.11 Frame Types

WMM

Back 66

WMM

Wireless Multimedia