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NETWORK + Week 2 > EXAMINING THE 802.11 STANDARD > Flashcards

EXAMINING THE 802.11 STANDARD Flashcards

1
Q

What are the 802.11 standards?

A

The IEEE’s working group for wireless local area networks (WLAN)

The 802.11 standards define the protocols for implementing wireless local area network (WLAN) communication.

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2
Q

What are the 802.11 standards to be aware of?

A

802.11a, 802.11b, 802.11g, 802.11n, 802.11ac, 802.11ax, 802.11be (in development)

These standards represent various generations of Wi-Fi technology.

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3
Q

What are the characteristics of 802.11a?

A
  • Speed - Up to 54 Mbps
  • Frequency - 5 GHz
  • Range - Shorter range due to higher frequency
  • Interference - Less interference
  • Wi-Fi Alliance Name - Wi-Fi 2 (unofficially)

802.11a operates in the 5 GHz band which allows for higher speeds but shorter range.

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4
Q

What are the characteristics of 802.11b?

A
  • Speed - Up to 11 Mbps
  • Frequency - 2.4 GHz
  • Range - Good range due to lower frequency
  • Interference - More interference (many devices use 2.4 GHz)
  • Wi-Fi Alliance Name - Wi-Fi 1 (unofficially)

802.11b’s lower frequency provides better range but is more susceptible to interference from other devices.

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5
Q

What are the characteristics of 802.11g?

A
  • Speed - Up to 54 Mbps
  • Frequency - 2.4 GHz
  • Range - Good range, similar to 802.11b
  • Interference - More interference (2.4 GHz is commonly used)
  • Wi-Fi Alliance Name - Wi-Fi 3 (unofficially)

802.11g combines the speed of 802.11a with the range of 802.11b.

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6
Q

What are the characteristics of 802.11n?

A
  • Speed - Up to 600 Mbps
  • Frequency - 2.4 GHz and 5 GHz
  • Range - Better than 802.11a/g, option for 2.4 GHz improves range
  • Interference - The 2.4 GHz band has more interference, less on the 5 GHz
  • Wi-Fi Alliance Name - Wi-Fi 4
  • MIMO - Supported (up to 4x4)

802.11n introduces MIMO technology which allows multiple antennas to improve performance.

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7
Q

What is the maximum speed of 802.11ac (Wi-Fi 5)?

A

Up to 6.9 Gbps

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8
Q

What frequency does 802.11ac (Wi-Fi 5) operate on?

A

5 GHz

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9
Q

What is the range characteristic of 802.11ac (Wi-Fi 5)?

A

Shorter than 2.4 GHz networks, better with beamforming

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10
Q

How does interference compare in 802.11ac (Wi-Fi 5)?

A

Less crowded, minimal interference

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11
Q

What is the Wi-Fi Alliance name for 802.11ac?

A

Wi-Fi 5

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12
Q

Is MIMO supported in 802.11ac (Wi-Fi 5)?

A

Supported (up to 8x8)

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13
Q

Is MU-MIMO supported in 802.11ac (Wi-Fi 5)?

A

Supported

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14
Q

What is the maximum speed of 802.11ax (Wi-Fi 6)?

A

Up to 9.6 Gbps

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15
Q

What frequencies does 802.11ax (Wi-Fi 6) operate on?

A

2.4 GHz and 5 GHz

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16
Q

What is the range characteristic of 802.11ax (Wi-Fi 6)?

A

Improved over Wi-Fi 5, especially in the 2.4 GHz band

17
Q

How does interference compare in 802.11ax (Wi-Fi 6)?

A

Technologies like OFDMA reduce interference

18
Q

What is the Wi-Fi Alliance name for 802.11ax?

A

Wi-Fi 6

19
Q

Is MIMO supported in 802.11ax (Wi-Fi 6)?

A

Supported (up to 8x8)

20
Q

Is MU-MIMO supported in 802.11ax (Wi-Fi 6)?

A

Supported

21
Q

What is the expected maximum speed of 802.11be (Wi-Fi 7)?

A

Expected to exceed 30 Gbps

22
Q

What frequencies does 802.11be (Wi-Fi 7) operate on?

A

2.4 GHz, 5 GHz, and 6 GHz

23
Q

What is the anticipated range characteristic of 802.11be (Wi-Fi 7)?

A

Anticipated to offer enhanced range with new technologies

24
Q

How is interference expected to be managed in 802.11be (Wi-Fi 7)?

A

Expected to be managed with advanced techniques

25
Q

What is the Wi-Fi Alliance name for 802.11be?

A

Wi-Fi 7 (anticipated)

26
Q

Is MIMO supported in 802.11be (Wi-Fi 7)?

A

Supported (expected to support higher than 8x8)

27
Q

Is MU-MIMO supported in 802.11be (Wi-Fi 7)?

A

Supported

28
Q

What is MIMO (Multiple Input Multiple Output)?

A

A technology using multiple antennas at both the transmitter and receiver.

29
Q

How does MIMO enhance communication performance?

A

Enhances communication performance, data rates, and network capacity by using multiple signal paths.

30
Q

What is MU-MIMO (Multi-User MIMO)?

A

An advancement of MIMO technology.

31
Q

How does MU-MIMO improve network efficiency?

A

Allows multiple users to simultaneously access the same network.

32
Q

What is a key feature of MU-MIMO regarding antennas?

A

Each user has their own dedicated set of multiple antennas, improving network efficiency and throughput.

33
Q

Why are channels important in WLANs?

A

Channels are important because each frequency used has specific channels and channel numbers.

34
Q

How many channels does 2.4 GHz use in North America?

A

2.4 GHz uses 11 channels in North America.

35
Q

How many non-overlapping channels does 2.4 GHz have?

A

2.4 GHz has three non-overlapping channels: 1, 3, and 11.

36
Q

Are all channels in 5 GHz overlapping?

A

No, all channels in 5 GHz are non-overlapping.

37
Q

What are the bands labeled in 5 GHz?

A

The bands in 5 GHz are labeled UNIl.

38
Q

What feature do some channels in 5 GHz support?

A

Some channels support dynamic frequency selection to allow wireless communication in the same channels as radar operates.

NETWORK + Week 2 (7 decks)

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