Wireless Networking Flashcards
A way to network without wires
Wireless Networking
The most common specifications for how wireless networking devices should communicated are defined by the…
IEEE 802.11 standards
Wireless networking devices communicate to each other through
Radiowaves
A certain section of the radio spectrum that’s been agreed upon to be used for certain communications
Frequency Band
In North America, FM radio transmissions operate between
88 and 108 MHz
WiFi networks operate on what frequency bands?
2.4GHz and 5GHz
Some of the most common specifications for 802.11 specifications?
- 11b
- 11a
- 11g
- 11n
- 11ac
802.11 defines how we operate at which layers?
physical and data link layers
_ is the first field of the 802.11 frame format. This field is 16 bits long and contains a number of subfields that are used to describe how the frame itself should be processed.
Frame control
_ is the second field of the 802.11 frame format. It specifies how long the total frame is, so the receiver knows how long it should expect to listen to this transmission.
Duration field
A device that bridges the wireless and wired portion of a network
Wireless access point
How many address fields are there in a 802.11 frame?
4
Address 1 field in the 802.11 frame defines the _
Source address - represents the MAC address of the sending device
Address 2 field in the 802.11 frame defines the _
Intended destination
Address 3 field in the 802.11 frame defines the _
Receiving address
Address 4 field in the 802.11 frame defines the _
Transmitter address
MAC address of the access point that should receive the frame
Receiving address (Address 3)
MAC address of the device that transmitted the frame
Transmitter address (Address 4)
How many bits is the Frame control field?
16 bits
How many bits is each Address field?
6 bits
How many bits is the Duration field?
2 bits
A 16 bit field in the 802.11 frame that contains a sequence number used to keep track of the ordering of frames
Sequence control field
This field has all of the data of the protocols further up the stack
Data payload
Contains a checksum used for a cyclical redundancy check, just like how ethernet does
FCS (Frame check sequence) field
