Computer Networks - Ch. 8

Front 1

Range of radio frequencies from 2.4 to 2.5835 GHz?

Back 1

2.4 GHz band

Front 2

A range of frequencies that comprises four frequency bands: 5.1 GHz, 5.3 GHz, 5.4 GHz, and 5.8 GHz?

Back 2

5-GHz band

Front 3

The IEEE standard for a wireless networking technique that uses multiple frequency bands in the 5-GHz frequency range and provides a theoretical maximum throughput of 54 Mbps?

Back 3

802.11a

Front 4

The IEEE standard for wireless networking technique that uses DSSS(direct-sequence spread spectrum) signaling in the 2.4-2.4835 GHz frequency range (2.4-GHz band)?

Back 4

802.11b

Front 5

The IEEE standard for a wireless networking technique designed to be compatible with 802.11b while using different encoding techniques that allow it to reach a theoretical maximum capacity of 54 Mbps?

Back 5

802.11g

Front 6

The IEEE standard for a wireless networking technique that may issue signals in the 2.4- or 5-GHz band and can achieve actual data throughput between 65 and 600 Mbps?

Back 6

802.11n

Front 7

An IEEE standard for wireless MANs?

Back 7

802.16

Front 8

Currently, the most popular version of WiMAX?

Back 8

802.16e

Front 9

A device used on wireless LANs that transmits and receives wireless signals to and from multiple nodes and retransmits them to the rest of the network segment?

Back 9

access point

Front 10

Method used by wireless stations to detect the presence of an access point?

Back 10

active scanning

Front 11

A type of wireless LAN in which stations communicate directly with each other (rather than using an access point)?

Back 11

ad hoc

Front 12

In the context of wireless networking, the communication that occurs between a station and an access point to enable the station to connect to the network via that access point?

Back 12

association

Front 13

Frame issued by an access point to alert other nodes of its existence?

Back 13

beacon frame

Front 14

Consortium of companies, including Sony Ericsson, Intel, Nokia, Toshiba, and IBM, that formally banded together in 1998 to refine and standardize Bluetooth technology?

Back 14

Bluetooth Special Interest Group (SIG)

Front 15

Wireless networking standard that uses FHSS (frequency hopping spread spectrum) signaling in the 2.4-GHz band to achieve a maximum throughput of either 723 Kbps or 2.1 Mbps, depending on the version?

Back 15

Bluetooth

Front 16

In IEEE terminology, a group of stations that share an access point?

Back 16

BSS(Basic Service Set)

Front 17

Identifier for a BSS (Basic Service Set)?

Back 17

BSSID(Basic Service Set Identifier)

Front 18

Combination of two 20-MHz frequency band to create one 40-MHz frequency band that can carry more than twice the amount of data that a single 20-MHz band could?

Back 18

channel bonding

Front 19

Network access method used on 802.11 wireless networks?

Back 19

CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance)

Front 20

Method of satellite Internet access in which a subscriber receives data via a satellite down-link transmission, but sends data to the satellite via an analog modem connection?

Back 20

dial return

Front 21

Phenomenon that occurs when an electromagnetic wave encounters an obstruction and splits into secondary waves?

Back 21

diffraction

Front 22

Type of antenna that issues wireless signals along a single direction, or path?

Back 22

directional antenna

Front 23

Connection from an orbiting satellite to an Earth-based receiver?

Back 23

downlink

Front 24

Transmission technique in which a signal's bits are distributed over an entire frequency band at once?

Back 24

DSSS(direct-sequence spread spectrum)

Front 25

Group of access points and associated stations (or BSS) connected to the same LAN?

Back 25

ESS(Extended service set)

Front 26

Special identifier shared by BSSs that belong to the same ESS?

Back 26

ESSID(extended service set identifier)

Front 27

Change in a wireless signal's strength as a result of some of the electromagnetic energy being scattered, reflected, or diffracted after being issued by the transmitter?

Back 27

fading

Front 28

Wireless signaling technique in which a signal jumps between several different frequencies within a band in a synchronization pattern known to the channel's receiver and transmitter?

Back 28

FHSS(frequency hopping spread spectrum)

Front 29

Type of wireless system in which the locations of the transmitter and receiver are static?

Back 29

fixed

Front 30

Refers to a satellite that maintains a constant distance from a point on the equator at every point in its orbit?

Back 30

GEO(geosynchronous orbit or geostationary orbit)

Front 31

Area covered by a wireless access point that provides visitors with wireless services, including Internet access?

Back 31

hot spot

Front 32

Type of WLAN in which stations communicate with an access point and not directly with each other?

Back 32

ifrastructure WLAN

Front 33

command line utility for viewing and setting wireless interface parameters on Linux and UNIX workstations?

Back 33

iwconfig

Front 34

Satellite that orbits the Earth with an altitude between 100 and 900 miles, closer to the Earth's poles than the orbits of either GEO or MEO satellites?

Back 34

LEO(low earth orbiting)

Front 35

Wireless signal or path that travels directly in a straight line from its transmitter to its intended receiver?

Back 35

LOS(Line of sight)

Front 36

Satellite that orbits the earth roughly 6000 to 12000 miles above its surface, positioned between the equator and the poles?

Back 36

MEO(medium earth orbiting)

Front 37

Ability for access points to issue multiple signals to stations, thereby multiplying the signals strength and increasing their range and data-carrying capacity?

Back 37

MIMO(multiple input-multiple output)

Front 38

Wireless system in which the receiver can be located anywhere within the transmitter's range?

Back 38

mobile

Front 39

Characteristic of wireless signals that follow a number of different paths to their destination?

Back 39

multipath

Front 40

Type of wireless transmission in which signals travel over a single frequency or within a specified frequency range?

Back 40

narrowband

Front 41

Type of antenna that issues and receives wireless signals with equal strength and clarity in all directions?

Back 41

Omnidirectional antenna

Front 42

Small network composed of personal communications devices?

Back 42

PAN(personal area network)

Front 43

Process in which a station listens to several channels within a frequency for a beacon issued by an access point?

Back 43

passive scanning

Front 44

Type of frame issued by a station during active scanning to find nearby access points?

Back 44

probe

Front 45

Relative strength over a 3-D area of all the electromagnetic energy an antenna sends or receives?

Back 45

radiation pattern

Front 46

Geographical area in which signals issued from an antenna or wireless system can be consistently and accurately received?

Back 46

Range

Front 47

Process of a station establishing a connection (or associating) with a different access point?

Back 47

reassociation

Front 48

Phenomenon that occurs when an electromagnetic wave encounters and obstacle and bounces back toward its source?

Back 48

reflection

Front 49

Process that describes a station moving between BSSs without losing connectivity?

Back 49

roaming

Front 50

Exchange in which a wireless station requests the exclusive right to communicate with an access point and the access point confirms that it has granted that request?

Back 50

RTS/CTS(Request to Send/Clear to Send

Front 51

Type of satellite Internet access service in which a subscriber sends and receives data to and from the Internet over the satellite link?

Back 51

satellite return

Front 52

Process a wireless station undergoes to find an access point?

Back 52

scanning

Front 53

Diffusion of a wireless signal that results from hitting an object that has smaller dimensions compared to the signal's wavelength?

Back 53

scattering

Front 54

Assessment of a client requirements, facility characteristics, coverage areas to determine an access point arrangement that will ensure reliable wireless connectivity within a given area?

Back 54

site survey

Front 55

Wireless transmission in which lower-level signals are distributed over several frequencies simultaneously?

Back 55

spread spectrum

Front 56

unique character string used to identify an access point on an 802.11 network?

Back 56

SSID (service set identifier)

Front 57

End node on a network; used most often in the context of wireless networks?

Back 57

station

Front 58

Equipment on a satellite that receives an uplinked signal from earth, amplifies the signal, modifies its frequency, then retransmits it (in a downlink) to an antenna on earth?

Back 58

transponder

Front 59

connection from an earth-based transmitter to an orbiting satellite?

Back 59

uplink

Front 60

Signals made of electromagnetic energy that travel through the atmosphere?

Back 60

Wireless

Front 61

Describes recently released standards for high-throughput, long-distance digital data exchange over wireless connections?

Back 61

wireless broadband

Front 62

Access point that provides routing functions and is used as a gateway?

Back 62

wireless gateway

Front 63

access point that provides routing functions?

Back 63

wireless router

Front 64

A continuum of electromagnetic waves used for data and voice communication?

Back 64

wireless spectrum

Front 65

LAN that uses wireless connections for some or all of its transmissions?

Back 65

WLAN(wireless LAN)