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Network + Exam N10-008 > Chapter 14: Wireless Networking > Flashcards

Chapter 14: Wireless Networking Flashcards

1
Q

The ____ standard defines both how wireless devices communicate and how to secure that communication.

A

802.11

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2
Q

What is Wi-Fi?

A

A family of protocols based on IEEE 802.11 standards.

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3
Q

What is a Wireless Access Point (WAP or AP)?

A

A device designed to interconnect wireless network nodes with wired networks and also bridges wireless network segments to wired network segments.

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4
Q

What is the 802.11 network operation mode where two or more devices communicate directly without any other intermediary hardware?

A

ad hoc mode

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5
Q

What is the 802.11 network operation mode that uses one or more WAPs?

A

infrastructure mode

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6
Q

Two or more wireless nodes communicating in ad hoc mode form a/an ____.

A

IBSS (Independent Basic Service Set)

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7
Q

A single WAP servicing a given area is called a/an ____.

A

BSS (Basic Service Set)

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8
Q

Multiple WAPs servicing an area is called a/an ____.

A

ESS (Extended Service Set)

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9
Q

What is a Basic Service Set Identifier (BSSID)?

A

The MAC address of a wireless access point.

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10
Q

What is a 32-bit identification string, sometimes called a network name, that’s inserted into the header of each data packet processed by a WAP (wireless access point)?

A

Service Set Identifier (SSID)

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11
Q

A spread-spectrum broadcasting method defined in the 802.11 standard that sends data out on different frequencies at the same time is called ____.

A

Direct-Sequence Spread-Spectrum (DSSS)

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12
Q

A spread-spectrum broadcasting method defined in the 802.11 standard that sends data on one frequency at a time, constantly shifting (or hopping) frequencies is called ____.

A

Frequency-Hopping Spread-Spectrum (FHSS)

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13
Q

A spread-spectrum broadcasting method defined in the 802.11 standard that combines the multiple frequencies of DSSS with FHSS’s hopping capability is called ____.

A

Orthogonal frequency-division multiplexing (OFDM)

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14
Q

Every Wi-Fi network communicates on a ____, a portion of the available spectrum.

A

channel

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15
Q

For the ____GHz band, the 802.11 standard defines 14 channels (US limits it to channels 1-11) of 20 MHz each.

A

2.4 GHz

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16
Q

What three channels in the 2.4 GHz band should be used on WAPs to avoid overlap?

A

1, 6, and 11

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17
Q

The versions of 802.11 that use the ____GHz and ____GHz bands use automatic channel switching and in general have around 40 different channels in the spectrums.

A

5.0 GHz, 6.0 GHz

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18
Q

Is radio a half-duplex or full-duplex transmission method?

A

half-duplex

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19
Q

Wi-Fi networks use carrier-sense multiple access with ____ (CSMA/____)?

A

collision avoidance (CSMA/CA)

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20
Q

Current CSMA/CA Wi-Fi devices use the ____ method for collision avoidance.

A

Distributed Coordination Function (DCF)

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21
Q

802.11-1997
Frequency
Spectrum
Speed
Range

A

Frequency: 2.4 GHz
Spectrum: DSSS
Speed: 2 Mbps
Range: ~300 feet

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22
Q

802.11b
Frequency
Spectrum
Speed
Range

A

Frequency: 2.4 GHz
Spectrum: DSSS
Speed: 11 Mbps
Range: ~300 feet

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23
Q

802.11a
Frequency
Spectrum
Speed
Range

A

Frequency: 5.0 GHz
Spectrum: OFDM
Speed: 54 Mbps
Range: ~150 feet

24
Q

802.11g
Frequency
Spectrum
Speed
Range

A

Frequency: 2.4 GHz
Spectrum: OFDM
Speed: 54 Mbps
Range: ~300 feet

25
Q

802.11n (Wi-Fi 4)
Frequency
Spectrum
Speed
Range

A

Frequency: 2.4 GHz
Spectrum: OFDM (QAM)
Speed: 100+ Mbps
Range: ~300 feet

26
Q

____ is a feature in 802.11n and later WAPs that enables them to make multiple simultaneous connections called streams.

A

Multiple Input/Multiple Output (MIMO)

27
Q

____ is a multiple-antenna technology in 802.11n WAPs that helps get rid of dead spots.

A

Transmit beamforming

28
Q

802.11ac (Wi-Fi 5)
Frequency
Spectrum
Speed
Range

A

Frequency: 5.0 GHz
Spectrum: OFDM (QAM)
Speed: Up to 1 Gbps
Range: ~300 feet

29
Q

____ is a feature of 802.11ac and later networking that enables a WAP to broadcast to multiple users simultaneously.

A

Multi-User MIMO (MU-MIMO)

30
Q

802.11ax (Wi-Fi 6/6E)
Frequency
Spectrum
Speed
Range

A

Frequency: 2.4 GHz, 5.0 GHz, 6.0 GHz
Spectrum: OFDMA (1024 QAM)
Speed: Up to 10 Gbps
Range: ~300

31
Q

What is Wi-Fi Protected Setup (WPS) and how does it work?

A

An automated and semi-automated process to connect a wireless device to a WAP. The process is either pressing a button on the device or pressing the button and then entering a PIN code.

32
Q

____ is an early wireless security protocol for Wi-Fi that uses the RC4 encryption algorithm and is no longer used due to major security vulnerabilities.

A

WEP or Wired Equivalent Privacy

33
Q

____ is a wireless security protocol that addresses weaknesses and acts as an upgrade to WEP. It also supports authentication using EAP.

A

WPA or Wi-Fi Protected Access

34
Q

____ is an authentication wrapper that ___-compliant applications can use to accept one of many types of authentication. It is a general-purpose authentication wrapper mainly used in wireless networks.

A

EAP or Extensible Authentication Protocol

35
Q

____ is a port-based authentication network access control mechanism for networks. It’s a complete authentication standard designed to force devices to go through a full AAA process to get anywhere past the interface on a network connection device such as a WAP (aka. network access server or NAS).

A

802.1X

36
Q

____ is the consumer name for the IEEE 802.11i standard and the replacement for the WPA protocol. It uses the AES (Advanced Encryption Standard) algorithm.

A

WPA2

37
Q

The process of using a mobile device’s built-in GPS capabilities and mobile networking capabilities to set geographical constraints on where the mobile device can be used is called ____.

A

geofencing

38
Q

A switch that’s designed to handle a number of WAPs simultaneously and does the job of configuring them is called a/an ____.

A

wireless LAN controllers

39
Q

____ is a method to load-balance wireless network clients associated with a single SSID. It distributes clients across many VLANs to avoid excessive levels of broadcast traffic.

A

VLAN pooling

40
Q

____ is a standard that enables wireless access points (WAPs) to receive their power from the same Ethernet cables that transfer their data.

A

PoE or Power over Ethernet

41
Q

An ____ radiates signal outward from the WAP in all directions.

A

omnidirectional antenna

42
Q

The strengthening and focusing of radio frequency output from a WAP is called ____.

A

gain

43
Q

An antenna that focuses all of its transmission energy in a single, relatively narrow direction is called ____. It’s design limits its ability to receive signals that are not aligned with the focused direction.

A

unidirectional

44
Q

____ are flat, plate-shaped antennas that generate a half-sphere beam and are placed on walls.

A

Patch antennas

45
Q

All radio signals have a property called ____, which describes the orientation of the radio waves which depends on the antenna.

A

polarization

46
Q

____ wireless bridges can only communicate with a single other bridge and are used to connect two wired network segments.

A

Point-to-point

47
Q

____ wireless bridges can talk to more than one other bridge at a time and can connect multiple network segments.

A

Point-to-multipoint

48
Q

Wi-Fi ____ is the loss of packets due to an overworked WAP.

A

jitter

49
Q

Wi-Fi ____ is when data stops moving for a moment due to a WAP being unable to do the work.

A

latency

50
Q

____ is when the frequency of a band is filled to capacity due to a large number of devices using the same bandwidth.

A

Bandwidth saturation

51
Q

What are the three physical problems that cause attenuation in Wi-Fi networks, the progressive loss of radio signal strength as the radio wave passes through different mediums?

A

Absorption
Reflection
Refraction

52
Q

A ____ is a Wi-Fi network implementation used in some public facilities that directs attempts to connect to the network to an internal Web page for that facility; generally used to force terms of service on users.

A

captive portal

53
Q

What is the progressive loss of radio signal passing through different media called?

A

Attenuation

54
Q

Which technology enables use of a WAP without directly connecting the WAP to an AC power outlet?

A

PoE

55
Q

What feature enabled 802.11n networks to minimize dead spots?

A

Transit beamforming

56
Q

When setting up WPA2-PSK on your wireless network, you have the option to choose TKIP or AES. Which should you implement?

A

AES

57
Q

What type of server supports EAP-encrypted passwords in accordance with the 802.1X standard?

A

RADIUS server

Network + Exam N10-008 (20 decks)

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