Cnna Final Exam Review Edition 7 Chapter 6

Front 1

2.4GHz

Back 1

Therange of radio frequencies from 2.4 to 2.4835 GHz. The 2.4-GHz band,which allows for 11 unlicensed channels in the United States (or upto 14 channels in other countries), is used by WLANs that follow thepopular 802.11b and 802.11g standards. However, it is also used forcordless telephone and other transmissions, making the 2.4-GHz bandmore susceptible to interference than the 5-GHz band.

Front 2

802.11wireless standards

Back 2

a,ac, a-ht, b, g, g-ht, n

Front 3

Adhoc

Back 3

Atype of wireless LAN in which stations communicate directly with eachother (rather than using an access point).

Front 4

Beaconframe

Back 4

Inthe context of wireless networking, a frame issued by an access pointto alert other nodes of its existence.

Front 5

Bluejacking

Back 5

Anattack in which a Bluetooth connection is used to send unsoliciteddata

Front 6

BSS

Back 6

(basicservice set) In IEEE terminology, a group of stations that share anaccess point

Front 7

CaptivePortal Page

Back 7

Thefirst page displayed by a client’s browser when the client connectsto a guest network. This page usually requires the user to agree to aset of terms and conditions before gaining further access to theguest network.

Front 8

ChannelBonding

Back 8

Inthe context of 802.11n and 802.11ac wireless technology, thecombination of two adjacent 20- MHz frequency bands to create one40-MHz frequency band that can carry more than twice the amount ofdata that a single 20-MHz band could. 802.11ac products also support80-MHz channel bonding by merging four 20-MHz channels, and someproducts can provide 160-MHz channels. Channel bonding is recommendedfor use only in the 5-GHz range because this band has more availablechannels and suffers less interference than the 2.4-GHz band.

Front 9

Cloud

Back 9

Theflexible provision of data storage, applications, or services tomultiple clients over a network. Cloud computing consolidatesresources and is elastic, metered, self-service, multiplatform, andavailable on demand.

Front 10

Diffraction

Back 10

Inthe context of wireless signal propagation, the phenomenon thatoccurs when an electromagnetic wave encounters an obstruction andsplits into secondary waves. The secondary waves continue topropagate in the direction in which they were split. If diffractedwireless signals were visible, they would appear to be bending aroundthe obstacle. Objects with sharp edges—including the corners ofwalls and desks—cause diffraction.

Front 11

Eviltwin

Back 11

Anexploit in which a rogue access point masquerades as a legitimateaccess point, using the same SSID and potentially other identicalsettings

Front 12

Fading

Back 12

Avariation in a wireless signal’s strength as a result of some ofthe electromagnetic energy being scattered, reflected, or diffractedafter being issued by the transmitter.

Front 13

Frameaggregation

Back 13

Inthe context of 802.11n and 802.11ac wireless networking, a techniquefor combining multiple data frames into one larger frame called anA-MSDU (Aggregated Mac Service Data Unit) or A-MPDU (Aggregated MacProtocol Data Unit). Both approaches combine multiple frames toreduce overhead. 802.11ac actually uses A-MPDU for all transmissionsby default.

Front 14

Goodput

Back 14

Thethroughput experienced at the application level, such as the qualityof a video feed or the speed of a Web page loading in the browser

Front 15

Hellopackets

Back 15

AcknowlegePackets

Front 16

IaaS

Back 16

(Infrastructureas a Service) A service model in which hardware services are providedvirtually, including network infrastructure devices such as virtualservers.

Front 17

IEEE

Back 17

(Instituteof Electrical and Electronics Engineers) A professional society thatdevelops national and international standards in a variety oftechnical areas.

Front 18

Infrared

Back 18

Amostly outdated wireless technology that requires an unobstructedline of sight between the transmitter and receiver.

Front 19

LoS

Back 19

(lineof sight) A wireless signal or path that travels directly in astraight line from its transmitter to its intended receiver. Thistype of propagation maximizes distance for the amount of energy usedand results in reception of the clearest possible signal.

Front 20

MeshWLAN

Back 20

Awireless network in which multiple APs work as peer devices on thesame network, thereby providing more fault-tolerant network access toclients.

Front 21

Multipathsignaling

Back 21

Becauseof reflection, diffraction, and scattering, wireless signals follow anumber of different paths to their destination.

Front 22

MU-MIMO

Back 22

I nthe context of 802.11ac wireless networking, the ability for accesspoints to use multiple antennas in order to issue multiple signals todifferent stations at the same time, thereby reducing congestion andcontributing to faster data transmission. MU-MIMO will becomeavailable with Wave 2 802.11ac products

Front 23

NFCtag

Back 23

Asmall, inexpensive device that uses NFC technology to store andtransmit data to another device, such as a smartphone; the data mightinclude contact information, showtime details, meeting arrangements,or an equipment label, or it could be a command to launch an app,change device settings, or navigate to a Web page. NFC tags requireno power source other than the receiving device’s power field. Alsocalled a smart tag.

Front 24

On-boarding

Back 24

Aprocess of configuring clients for wireless access to a network

Front 25

PaaS

Back 25

(Platformas a Service) A service model in which various platforms are providedvirtually, enabling developers to build and test applications withinvirtual, online environments tailored to the specific needs of aproject.

Front 26

Passivevs Active scanning

Back 26

Passive:Inthe context of wireless networking, the process by which a stationlistens to several channels within a frequency range for a beaconframe issued by an access point.

Active:Amethod used by wireless stations to detect the presence of an accesspoint. In active scanning, the station issues a probe to each channelin its frequency range and waits for the access point to respond.

Front 27

Reflection

Back 27

Inthe context of wireless signaling, the phenomenon that occurs when anelectromagnetic wave encounters an obstacle and bounces back towardits source. A wireless signal will bounce off objects whosedimensions are large compared with the signal’s average wavelength.

Front 28

RTS/CTS

Back 28

(Requestto SendlClear to Send) An exchange in which a source node requeststhe exclusive right to communicate with an access point and theaccess point confirms that it has granted that request.

Front 29

Scattering

Back 29

Thediffusion, or the reflection in multiple directions, of a wirelesssignal that results from hitting an object that has small dimensionscompared with the signal’s wavelength. Scattering is also relatedto the roughness of the surface a wireless signal encounters. Therougher the surface, the more likely a signal is to scatter when ithits that surface.

Front 30

Sitesurvey

Back 30

nthe context of wireless networking, an assessment of clientrequirements, facility characteristics, and coverage areas todetermine an access point arrangement that will ensure reliablewireless connectivity within a given area.

Front 31

Wardriving

Back 31

Theact of driving around an area while running a laptop configured todetect and capture wireless data transmissions.

Front 32

WirelessSecurity?

Back 32

WEP,WPA, WPA2, WPA-Enterprise, WPA2-Enterprise

Front 33

WPSAttack

Back 33

Asecurity exploit in which a WPS PIN is discovered by means of a bruteforce attack, giving the attacker access to the network’s WPA2 key.The PIN feature in WPS should be disabled if possible.