Section 2.4 Flashcards

1
Q

List all 802.11 standards in chronological order

A

a, b, g, n, ac, ax

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2
Q

WiFi 4 =

A

n

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3
Q

WiFi 5 =

A

ac

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4
Q

WiFi 6 =

A

ax

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5
Q

802.11a
Frequency
Speed

A

5 GHz
54 Mbps

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6
Q

802.11b
Frequency
Speed

A

2.4 GHz
11 Mbps

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7
Q

802.11g
Frequency
Speed

A

2.4 GHz
54 Mbps

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8
Q

802.11n
Frequency
Speed

A

2.4 / 5 GHz
150 Mbps
x4 MIMO = 600 Mbps

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9
Q

802.11ac
Frequency
Speed

A

5 GHz
867 Mbps
x8 MU-MIMO = 6.9 Gbps

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10
Q

802.11ax
Frequency
Speed

A

2.4 / 5 GHz
1,201 Mbps
x8 MU-MIMO = 9.6 Gbps

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11
Q

Difference between 2.4 GHz and 5 GHz

A

2.4 GHz: Slower but greater range
5 GHz: Faster but shorter range

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12
Q

Which 802.11 standards support channel bonding?

A

n, ac, and ax
(wifi 4, 5, and 6)

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13
Q

What is Channel Bonding?

A

Where you combine 2 wifi channels (contiguous or not) into one which increases throughput

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14
Q

What’s the difference between “bandwidth” and “throughput”?

A

Bandwidth is theoretical
Throughput is realized

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15
Q

IBSS

A

Independent Basic Service Set

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16
Q

What does IBSS allow?

A

It allows 2 wireless devices to connect directly to each other (ad hoc)

17
Q

SSID

A

Service Set Identifier

18
Q

BSSID

A

Basic Service Set Identifier

19
Q

What’s the difference between a BSSID and an SSID?

A

SSID is the given name
BSSID is the MAC Address

20
Q

ESSID

A

Extended Service Set Identifier

21
Q

What does an ESSID allow?

A

Allows you to seamlessly stay connected to a network that uses multiple access points

22
Q

What types of MIMO do 802.11 n, ac, and ax support?

A

n = MIMO
ac = Downstream MU-MIMO
ax = Downstream & Upstream MU-MIMO

23
Q

MU-MIMO

A

Multi-User Multiple Input Multiple Output

24
Q

How can you focus a wifi signal as opposed to sending it evenly everywhere?

A

with a Directional antenna

25
Q

What’s a benefit of a Directional antenna?

A

Increased range

26
Q

Why are some wireless channels not available to us, and what are they used for?

A

because they’re already in use by regulated bodies
examples:
weather radar, military radar, cellular, satellite, TV

27
Q

What’s the difference between “Personal” and “Enterprise” wireless encryption standards?

A

Personal uses a shared password (PSK, Pre-Shared Key)
Enterprise uses a 802.1X (backend authentication protocol) for individual authentication

28
Q

What eventually unified CDMA and GSM cellular technologies?

A

LTE (Long Term Evolution)