Protocols for Wireless Networking Flashcards
What is WI-FI? Who created the Standard?
All Devices with the WI-FI trademark use an IEEE Standard
- Institute of Electrical and Electronics Engineers
802.11a - The first wireless standard(1999)
5GHz , 54Mbps, Low Range, Not really used anymore
802.11b
Uses 2.4Ghz frequency, 11Mbps, had a better range than the 5Ghz range
Interference from household devices, Microwave ovens, baby monitors, cordless phones
802.11g
Uses 2.4Ghz Frequency, 54 Mbps,
Backwards compatible with 802.11b, Same interference issues as 802.11b
802.11n
October 2009
Works on both 2.4Ghz and 5Ghz
600 Mbps
Multiple-input, Multiple Output antennas
MIMO
802.11ac (Wifi 5)
January 2014
5GHZ
6Gb/s
802.11ax(Wifi 6)
August 2019
Works on both 2.4Ghz and 5Ghz
14Gbps
802.11ax-2021 (Wi-Fi 6E)
Certified in January 2021
Uses the 6Ghz band
Only 802.11ax devices supported on the 6Ghz band
Wireless Regulations
Two Types of Frequencies
Licenses
- A company needs to buy a license to transmit in that frequency
Unlicensed
- Everyone can use this frequency to transmit data
Wi-fi Frequencies are unlicensed - Regulations are hard coded in the router
FCC - Federal Communications Commission
Bluetooth
Wireless Standard for exchanging data over short distances
-800 feet in Bluetooth 5.0
-Operates in the 2.4Ghz
-Very Low battery consumption in Bluetooth “Classic” compared to Wi-Fi
- Bluetooth Low Energy(BLE) is a version of Bluetooth with even lower consumption
Lower Maximum speed than WiFi
- WiFi 6E = 1Gbps+
- Bluetooth : 1-3Mbps
What is NFC?
Near Field Communication is the allow the exchanging of information under a very low range, under 10 centimeters
Passive or Active
- Passive: bus Card, Credit Cards,
- Active : Phone, Card Reader
What is RFID?
Radio-Frequency Identification
Has a Similar Purpose as barcode. Does not need direct line of site, ex. self checkout
Used in automobile creation to track car through assembly line
Can be implanted underneath the skin. Ex. Tracking Live Stock
