Wifi And Rf Theory Flashcards

1
Q

What’s the basic transmission rate in the 2.4ghz band

A

1 or 2 mbps

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2
Q

What’s the basic transmission rate in the 5 ghz band

A

6mbps

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3
Q

What’s the basic transmission rate in the 6ghz band

A

20gbps

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4
Q

What is the osi model?

A

Conceptual model for computing devices.

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5
Q

What is wifi also known as?

A

802.11 protocol

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6
Q

What is wifi?

A

A set of rules that dictate how wireless devices connect to and communicate with each other

802.11 protocol

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7
Q

What layers does the wifi model operate in

A

Layers 1 and 2

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8
Q

Layer 1 for wifi

A

Air is the medium

Conditions are frequency, modulation and transmission type

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9
Q

Ieee

A

Institute of electrical and electronics engineers

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10
Q

What transmission rate do management frames get sent on?

A

Basic transmission rate

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11
Q

What is the significance of 802.11 basic transmission rates?

A

Management frames are sent at this rate

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12
Q

Can basic transmission rates be modified?

A

Yes.

Within router settings

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13
Q

How wide are dsss channels

A

22mhz

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14
Q

How wide are ofdm channels?

A

20mhz

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15
Q

What are 2.4ghz non overlapping channels?

A

1 6 and 11

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16
Q

How wide are all 5ghz channels?

17
Q

How many non overlapping channels does 5ghz have?

18
Q

What is Channel bonding?

A

Combines channels into wider subcarriers.

Routers detect unused adjacent channels (automatically).

19
Q

Mimo

A

Multiple input multiple output.

Multiple antennas send data in multiple data streams.

Data is split in between Send and receive antenna

20
Q

What must a device be compatible with for sustained communications?

A

Frequency
802.11 amendment (a b g n ac …)
Mimo
Polarity

21
Q

What is the basic transmission rate?

A

Lowest supported rate of all devices on a network

22
Q

What does layer 2 do?

A

Delivers reliable transmission between two physical nodes.

23
Q

What are the cornerstones of 802.11 analysis?

A

Mac addresses

Frames

24
Q

MAC address

A

6 bytes

First 3 bytes = organisationally unique identifier

Last 3= universally administered address

25
What is a frame?
Sef contained independent entities of data carrying sufficient information to be routed from source to destination
26
What addresses does a frame contain?
Source address Transmit address Receive address Destination address
27
What are the three frame types?
Management Control Data
28
What’s a management frame
Used to facilitate connections and transmitted at the basic rate 1-2 mbps @ 2.4ghz 6 mbps @ 5 ghz
29
What’s a control frame?
Used to facilitate the exchange of data from higher protocols
30
What’s a data frame?
Contain data from higher layers. Sent at highest allowable data rates.
31
What are management frame subtypes?
Bacon Probe request/response Authentication Association Action
32
What are control frame subtypes?
Rts Cts Ack Block ack Power saving-poll Cf-end
33
What are data frame subtypes?
Data Null