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Wireless > 802.11 > Flashcards

802.11 Flashcards

1
Q

who is in charge of the standards and policies for certain electronic equipment?

A

The Institute of Electrical and Electronics Engineers (IEEE)

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2
Q

United Nations’ agency responsible for coordinating global use of the RF spectrum, satellite orbits, and international communications standards.

A

International Telecommunication Union (ITU)

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3
Q

In the United States, _____ regulates RF spectrum use and broadband services. The FCC separated the spectrum into licensed and unlicensed bands.

A

Federal Communications Commission (FCC)

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4
Q

Operators in licensed bands, however, must have a license because they are allowed to follow different rules, such as transmitting at higher powers.

FCC approved 802.11 on only channels 1-11 of the 2.4 GHz band and most of the 5 GHz UNII bands

A

Licensing

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5
Q

specifying Wi-Fi technologies at the Physical (PHY), and MAC sub layer of the Data-Link

Infrared at 1 Mbps data rates

Frequency-Hopping Spread-Spectrum (FHSS) at 1 Mbps and 2 Mbps data rates

Direct-Sequence Spread-Spectrum (DSSS)

2.4 GHz

A

first 802.11 standard aka 802.11 prime (1997)

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6
Q

wireless information is converted to a digital format in the form of bits

A

In higher order of modulation

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7
Q

used in in Wi-Fi 802.11ac, 4G, 5G cellular technologies, WiMAX, satellite, etc. OFDM utilizes the available bandwidth better and offers higher data transmission rate.

A

Orthogonal frequency-division multiplexing (OFDM)

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8
Q

means signals are multiplexed in a way that the peak of one signal occurs at the null of the other neighbor signals.

A

Orthogonal

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9
Q

process of combining one or more cellular modem connections into a single, faster virtual connection allowing the end user to utilize combined bandwidth.

A

Channel Bonding

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10
Q

uses multiple transmitters and receivers to transfer more data at the same time.
More antennas usually equate to higher speeds.

A

MIMO (Multiple Input Multiple Output)

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11
Q

an over-the-air interface between a wireless client and a base station or between two wireless clients.

A

802.11 Wireless Local Area Network (WLAN)

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12
Q

Access Point default mode

A

Master

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13
Q

client’s default mode

A

Managed

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14
Q

enables a client to communicate with another client without the need for an access point

A

Ad hoc

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15
Q

passively monitor RF signals

A

Monitor

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16
Q

allows access points to extend the range of another access point by helping relay traffic

A

Repeater

17
Q

layer 2 routing, and helps any station act as a routing node

A

Mesh

18
Q

access point connected to the main wired network

A

Root Mode

19
Q

provides wireless connectivity between multiple wired networks

A

Bridge Mode

20
Q

connectivity between a group of wired network stations

A

Workgroup Bridge Mode

21
Q

re-broadcasts a signal

A

Repeater Mode

22
Q

rich interconnection of communication networks made up of radio nodes

A

Mesh Mode

23
Q

when a client device discovers wireless networks within range of a Wi-Fi adapter.

A

Scanner Mode

24
Q

two kinds of wireless gateways

A

Residential and Enterprise

25
Q

home router, and it provides a wireless internet connection in a small setting

A

Residential

26
Q

for larger scale wireless local area networks (WLAN) such as offices.

A

Enterprise

27
Q

allows a wireless network to expand using multiple access points without a traditional wired link between them.

A

Wireless Distribution System (WDS)

28
Q

Independent Basic Service Set (IBSS), Basic Service Set (BSS) and Extended Service Set (ESS)

A

IEEE 802.11 supports three basic topologies for WLAN

29
Q

ad-hoc mode or peer-to-peer mode refers to an office network in which there is no single node required to functions as a server.

A

IBSS

30
Q

contains at least one access point connected to a wired network infrastructure and a set of wireless end stations.

A

BSS

31
Q

has multiple overlapping BSSs (each BSS having at least one access point) connected by the means of a Distributed System.

A

ESS

32
Q

usually a web page where the user of a public-access network is forced to interact with in order to gain access to their Wi-Fi.

A

Captive portals

33
Q

requires a user to look/read over their acceptable user policy (AUP) page and agree to it before granting access.

A

Simple Captive Portal

34
Q

may ask for a username and password before granting internet access to a user.

A

Complicated Captive Portal

35
Q

How many modes of operation are there in a station?

A

6

Wireless (6 decks)

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