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CompTIA Network+ Wireless Networking > Wireless Standards > Flashcards

Wireless Standards Flashcards

1
Q

Which body creates and maintains wireless operationsla standards?

A

IEEE

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2
Q

What does the Wi-Fi Alliance do?

A

Tests for WLAN interoperability

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3
Q

Who produces common wireless standards in Europe

A

European Telecommunications Standards Institute

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4
Q

what are the industrial and scientific wireless bands?

A

900Mhz and 2.4Ghz

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5
Q

Which modulation technique helps to prevent eaves dropping of calls and provided a bandwidth between 14.4K to 64Kpbs.

A

Time Division Multiple Access

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6
Q

Describe the key feature of Code Division Multiple Access cellular modulation

A

Assigns a unique code to each transmission and spreads it across the frequency spectrum. Allowing a cellular call to make use of all frequencies.

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7
Q

Which is the most widely deployed standard offering 11Mbps?

A

802.11b

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8
Q

Users connecting to an AP using 802.11g complain that their speed is slow, what could be the problem?

A

There is someone connected using 802.11b which forces lower speed modulation

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9
Q

What is the word used to describe actual data throughput?

A

Goodput

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10
Q

What is the key problem with 802.11b communication?

A

The Data Link layer uses a CMSA/CA option called Request To Send/Clear To Send which has a lot over overhead.

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11
Q

When installing Wireless APs, what strategy should you employ when it comes to setting channels? Why?

A

Each AP should use the channel that is farthest from the channel used by the adjacent AP. This reduces interference.

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12
Q

Which feature of 802.11h automatically detects radar frequencies and shuts down wireless channels that are close to that frequency?

A

Dynamic Frequency Selection

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13
Q

What feature of 802.11h can save energy and reduce interference at the same time?

A

Transmit Power Control

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14
Q

What is MIMO and which wireless standard uses it?

A

Multiple-Input Multiple-Output sends several frames over several antennas over several paths that are recombined by several antennas. (spatial multiplexing) It allows for faster throughput

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15
Q

Which component of 802.11n saves overhead by allow a greater amount of packets to be send before acknowlegment?

A

MAC Efficiency/Block acknowledgement

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16
Q

How many MIMO spatial streams can 802.11n support?

A

4

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17
Q

Which wireless standard supports up to 8 antennas?

A

802.11ac

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18
Q

What is the difference between the number of antennas and spatial streams?

A

Spatial streams are the number of data-streams that a group of antennas can transmit/receive.

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19
Q

How are 802.11ac frames identified?

A

By 4 fields in the frame indicating VHT (Very High Throughput)

20
Q

List the wireless modulation techniques in order of performance

A

1) OFDM (Orthogonal Frequency Division Multiplexing)
2) DSSS (Direct Sequence Spread Spectrum)
3) FHSS (Frequency Hopping Spread Spectrum)
4) IR

21
Q

Which modulation type does 802.11b use?

A

DSSS

22
Q

What modulation type does Bluetooth use?

A

Frequency Hopping Spread Specturm (FHSS)

23
Q

List the wireless standards in the general order of performance where 1 is the lowest

A

1) 802.11
2) 802.11b
3) 802.11g
4) 802.11a
5) 802.11n
6) 802.11ac

24
Q

Which IEEE extension allows up to 23 non-overlapping channels

A

802.11h

25
Q

Which IEEE committee is implemented as WPA2?

A

802.11i

26
Q

Which wireless standards use fields in frames designating them as High Throughput?

A

802.11a and 802.11g

27
Q

If the transmitting medium is not clear when a wireless host checks to transmit, what happens?

A

1) The host will use the random back-off algorithm countdown timer
2) When the counter reaches zero it will check the medium. If it is clear, it will transmit

28
Q

An access point sees that a frame is bound for a host on the wired LAN on a different segment. What 2 things does it do with the frame to get it to the destination?

A

1) It replaces the 802.11 MAC header with an ethernet header using it’s own MAC address as the source address
2) It sets the destination MAC address as the MAC address of the default gateway

29
Q

Which IEEE standard is an extension to 802.11a and contains signal management features called DFS (Dynamic Frequency Selection) and PTC (Power Transmit Control)

A

802.11h

30
Q

Why are standards using 5Ghz frequency faster than 2.4Ghz?

A

1) 5ghz band is immune to interference coming from a variety of equipment operating near the 2.4Ghz band
2) Allows for up to 23 non-overlapping channels
3) Higher frequencies can transmit more data in the same amount of time

31
Q

What does the 2*2 mean in relation to MIMO?

A

2 antennas on the WAP and 2 antennas on the client are used.

32
Q

Which two wireless standards support MIMO?

A

802.11n and 802.11ac

33
Q

HPSA+ is a variation of what?

A

3G cellular

34
Q

What is the maximum data throughput downstream and upstream for LTE/4G?

A

299Mbps down, 75.4Mbps up

35
Q

CDMA allows simultaneous voice and data, TRUE or FALSE?

A

FALSE

36
Q

List the 6 wireless technologies that facilititate IoT

A

1) Z-wave
2) Ant+
3) Bluetooth
4) NFC (near Field Commuication)
5) RFID
6) 802.11

37
Q

NFC is typically used for when using the mobile phone to tap and pay - TRUE or FALSE

A

TRUE

38
Q

NFC requires a nominal distance of what to work?

A

4 centimeters

39
Q

What is the current version of Bluetooth, why was it created and what is the maximum distance it can communicate at?

A

Bluetooth 5.0.
To support IoT
800 feet

40
Q

What is the max distance a passive RFID tag can be read at?

A

600 feet

41
Q

What is the maximum speed of Bluetooth 4?

What is the max speed of bluetooth 5?

A

25Mpbs

100Mbps

42
Q

If an IoT device has to connect to a network, what is the most common wireless technology used?

A

802.11

43
Q

How many frequency bands does RFID use? Why?

A

4

Each band has a varying distance capability and so allows for tailoring of applications

44
Q

Which RFID transponder can work at a greater distance, Active, or Passive?

A

Active. Active transponders had a built in power source.

45
Q

Which wireless communication protocol is often used in home automation?

A

Z-wave

46
Q

Which wireless protocol is often used in health and fitness equipment?

A

ANT+

47
Q

Z-wave functions in what kind of topology?

A

Mesh

CompTIA Network+ Wireless Networking (5 decks)

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