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CompTIA A+ > 2.3 Wireless Frequencies > Flashcards

2.3 Wireless Frequencies Flashcards

1
Q

What are the three main spread spectrum transmission methods used in wireless networking?

A

DSSS, FHSS, and OFDM.

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2
Q

What does DSSS (Direct Sequence Spread Spectrum) do?

A

Spreads data across the entire frequency range, making it more prone to interference.

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3
Q

What does FHSS (Frequency Hopping Spread Spectrum) do?

A

Hops between predetermined frequencies for increased security but reduces network speed.

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4
Q

What does OFDM (Orthogonal Frequency Division Multiplexing) do?

A

Uses multiple simultaneous transmissions for higher speeds and better interference resistance.

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5
Q

Which transmission method is dominant in modern Wi-Fi?

A

OFDM (Orthogonal Frequency Division Multiplexing).

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6
Q

How many channels does the 2.4 GHz frequency band have in the US?

A

11 channels.

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7
Q

How many non-overlapping channels are available in the 2.4 GHz band?

A

3 (Channels 1, 6, and 11).

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8
Q

How many channels are available in the 5 GHz frequency band?

A

24 non-overlapping channels.

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9
Q

What are the advantages of the 2.4 GHz Wi-Fi band?

A

Longer range but more interference due to crowded spectrum.

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10
Q

What are the advantages of the 5 GHz Wi-Fi band?

A

Higher speeds and less interference but shorter range.

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11
Q

What is the default channel width for Wi-Fi networks?

A

20 MHz.

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12
Q

What is channel bonding?

A

Merging two or more Wi-Fi channels to increase data speeds.

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13
Q

What are the possible channel widths in the 5 GHz band?

A

20 MHz, 40 MHz, 80 MHz, 160 MHz.

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14
Q

What is the downside of using wider channels in 5 GHz networks?

A

Increases interference risk by reducing the number of available non-overlapping channels.

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15
Q

What channel widths does Wi-Fi 6E (802.11ax) support in the 6 GHz band?

A

20 MHz, 40 MHz, 80 MHz, 160 MHz.

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16
Q

Why should you use channels 1, 6, and 11 in 2.4 GHz networks?

A

They are the only non-overlapping channels in the 2.4 GHz band, reducing interference.

17
Q

What is a common Wi-Fi problem caused by overlapping channels in 2.4 GHz?

A

Increased interference and network congestion.

18
Q

Which Wi-Fi band is better for high-speed applications like video streaming?

A

5 GHz, due to its wider channels and lower interference.

19
Q

Which Wi-Fi band is better for penetrating walls and long-distance coverage?

A

2.4 GHz.

20
Q

What is the main trade-off when using channel bonding?

A

Higher speeds vs. increased interference.

21
Q

Why is OFDM preferred over DSSS and FHSS?

A

It provides faster speeds and better resistance to interference.

CompTIA A+ (86 decks)

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