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N+ > Wireless > Flashcards

Wireless Flashcards

1
Q

The standard channel size for 2.4 GHz and 5 GHz wireless networks?

A

20 MHz channel size

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2
Q

Channel Bonding

A

Allows for the creation of a wider wireless channel by merging neighboring channels into one.

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3
Q

Channel

A

A virtual medium through which wireless networks can send and receive data

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4
Q

Which wireless channels should be used to avoid overlapping frequencies in the 2.4 GHz band?

A

1, 6, and 11

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5
Q

What is the standard size for wireless channels in 2.4 and 5 GHz networks?

A

20 MHz

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6
Q

Multipl-Input and Multiple-Output (MIMO)

A

Uses multiple antennas to send and receive more data than it could with a single antenna

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7
Q

Multiple User Multipl-Input and Multiple-Output (MU-MIMO)

A

Allows multiple users to access the wireless network and access point at the same time

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8
Q

Goefencing

A

Uses GPS or RFID to define real-world boundaries where barrier can be active or passive

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9
Q

Rogue Access Point

A

A fake ap set up to lure legitimate users to connect and capture all the packets going through

Evil Twin

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10
Q

War Driving

A

Occurs when users perform reconnaissance looking for unsecured wireless networks

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11
Q

802.11a

A

5 GHz
54 Mbps

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12
Q

80211.b

A

2.4 GHz
11 Mbps

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13
Q

802.11g

A

2.4 GHz
54 Mbps

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14
Q

802.11n

A

2.4 and 5 GHz
150 Mbps / 600 Mbps (MIMO)
(Wi-Fi 4)

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15
Q

802.11ac

A

5 GHz
6.9 Gbps (MU-MIMO)
(Wi-Fi 5)

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16
Q

802.11ax

A

2.4, 5, and 6 GHz
9.6 Gbps
(Wi-Fi 6)

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17
Q

Support 2.4 GHz

A

802.11b
802.11g
802.11n
802.11ax

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18
Q

Support 5 GHz

A

802.11a
802.11n
802.11ac
802.11ax

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19
Q

Dual band standards

A

802.11n
802.11ax

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20
Q

Open

A

No security or protection

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21
Q

WEP

A

Initialization vector, flaw in WEP
Weak don’t use

22
Q

WPA

A

*TKIP
*RC4 encryption
*Weak don’t use

23
Q

WPA2

A

CCMP
AES encryption

24
Q

Received Signal Strength Indicator (RSSI)

A

Signal strength as measured at the receiver, using either decibel units or an index value.

25
Q

Direct-Sequence Spread Spectrum (DSSS)
Frequency-Hopping Spread Spectrum (FHSS)
Orthogonal Frequency Division Multiplexing (OFDM)
Quadrature Amplitude Modulation (QAM)
Quadrature Phase-shift keying (PSK).

A

Methods of wireless modulation

Sprea Spectrum
Orthogonal
Quadrature

26
Q

Received Signal Strength Indication (RSSI)

A

Estimated measure of the power level that a radio frequency client device is receiving from a wireless access point or wireless router

27
Q

Effective Equivalent Isotropic Radiated Power (EIRP)

A

Maximum power radiated from an ideal isotropic antenna, given its antenna gain, and the transmitter power of the radio frequency system

28
Q

Vertical Antenna

A

Radio frequency waves extend outward in all directions away from the antenna and the wireless access point at an equal power level

29
Q

Dipole Antenna

A

Produces radio frequency waves extending outward in two directions

30
Q

Yagi Antenna

A

A unidirectional antenna that sends the radio frequency waves in only one direction

31
Q

Parabolic Grid Antenna

A

Allows the radio waves to be transmitted in only one direction over a longer distance than a Yagi antenna

32
Q

Polarization

A

The orientation of the electric field (or transmission) from the antenna

33
Q

Channel Utilization

A

A statistic or measure of the amount of airtime utilization for a particular frequency or channel

34
Q

Clear Channel Assessment (CCA)

A

Listens to see if another device is actively transmitting on the channel before attempting to send frames on the channel

35
Q

Site Survey

A

Process of planning and designing a wireless network to provide the required wireless solution

36
Q

Multipath Reception

A

Occurs when the transmitted signal bounces off walls and other physical objects and then is redirected to the receiver

37
Q

HTTP Redirect

A

Redirects all traffic to a web server which then redirects them to a captive portal using a 302 HTTP status code

38
Q

5G comes in three bands. Low, Mid, and High. Higher is faster but smaller range.

A

5G comes in three bands. Low, Mid, and High. Higher is faster but smaller range.

39
Q

Code-Division Multiple Access

A

A cellular technology that uses code division to split up the channel.

40
Q

Global System for Mobile Communications

A

A cellular technology that takes the voice during a call then converts it to digital data.

41
Q

Microwave/Worldwide Interoperability for Microwave Access (WiMax)

A

Uses a beam of radio waves in the microwave frequency range to transmit information between two fixed location.

42
Q

Ad-Hoc Mode

A

Each wireless device communicates directly to another, without the need of a centralized access point.

43
Q

Infrastructure Mode

A

All wireless devices communicate through a centralized access point or router.

44
Q

Mesh Topology

A

Uses a combination of different wireless networks such as Wi-Fi, microwave, cellular, and more.

45
Q

Range Extender

A

Specialized device that overcomes distance limitation of wireless networks.

46
Q

2.4 GHz

A
  • Better at propagating through solid surfaces, longer signal range.
  • Does not support high number of channels
  • Often congested, by other Wi-Fi and other wireless technology
  • Increased risk of interference,
  • Data rates typically lower than 5 GHz.
47
Q

5 GHz

A
  • Less effective at penetrating solid surfaces and doesn’t support the max ranges achieved with 2.4 GHz
  • Supports more channels
  • Suffers less from congestion and interference
  • Higher data rates at shorter ranges.
  • 25 non-overlapping channels
48
Q

3G

A
  • GPRS/EDGE (General Packet Radio Services/Enhanced Data Rates for GSM Evolution)
  • HSPA+ (Evolved High Speed Packet Access)
  • EV-DO (CDMA2000/Evolution Data Optimized)
49
Q

4G

A
  • LTE Long Term Evolution
  • LTE-A LTE Advanced
50
Q

NFC (Near Field Communication)

A
  • Communication protocols between two devices at 4 cm or less
  • Used with payment systems like Apple Pay
  • Supports two-way communication
  • Low-speed connection with a simple setup that can bootstrap more capable wireless connections.
51
Q

Bluetooth

A
  • Sshort-range wireless technology standard
  • Used for exchanging data between fixed and mobile devices over short distances
  • Use UHF radio waves in the ISM band from 2.402 GHz to 2.48 GHz
  • Used to create peer-to-peer connections between two devices for a distance of up to 10 meters

N+ (22 decks)

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