2.3 Wireless Network Standards Flashcards
What organization managed the standards for wireless networking (802.11)?
IEEE LAN / MAN Standards Committee (IEEE 802)
Who trademarked the Wi-Fi logo?
Wi-Fi Alliance, who also handles interoperability tesing
When was the first wireless standard released and what were its specs?
802.11a, released October 1999, operates in 5 GHz range at 54 mbps. Has a smaller range than 802.11b (2.4 GHz)
Why would you choose 802.11b over 802.11a?
Because it bounces off materials instead of being absorbed by them, it has less absorption problems. Its slower speed of 11 mbps is a disadvantage. It also competes with other 2.4 GHz frequencies such as Bluetooth, microwaves, and baby monitors
What frequency standard was released in June 2003?
802.11g, considered an upgrade to 802.11b. Because it’s backwards compatible, you can use 802.11b devices on the g network. Runs at 54 mbps but has same 2.4 GHz frequency issues as 802.11b
What frequency standard was released in October 2009?
802.11n (Wi-Fi 4), first modern standard. Upgrades a, b, and g to both 5 GHz and 2.4 GHz. Wider channel widths at 40 MHz means throughput of 600 mbps. Introduces MIMO (multiple input, multiple output) means that multiple antennas can transmit and receive signals
What frequency standard was released in January 2014?
802.11ac (Wi-Fi 5), an upgrade to 802.11n. Exclusively operates in 5 GHz band. Wider band of 160 MHz means more channels can be used simultaneously, resulting in more bandwidth. Denser signal modulation means data transfers are faster. Introduced 8 MU-MIMO (multi-user MIMO) downlink streams so you can have twice as many streams as 802.11n at nearly 7 GBps.
How can a router run 802.11ac but have outputs for 2.4 GHz?
Those outputs are running 802.11n which supports 2.4 GHz
Which standard was approved in February 2021?
802.11ax (Wi-Fi 6), an upgrade to 802.11ac / Wi-Fi- 5. Supports channel widths of 20, 40, 80, and 160 MHz for throughput of 1,201 mbps. Big difference is orthogonal frequency-division multiple access (OFDMA) which operates like a cellular network so many devices work even in dense areas
What were the names of all the standards and their maximum theoretical throughput?
802.11a, 5GHz, 54 Mbps
802.11b, 2.4 GHz, 11 Mbps
802.11b, 2.4 GHz, 54 Mbps
802.11n, 5 GHz and 2.4 GHz, 4 streams at 150 Mbps = 600 Mbps
802.11ac, 5 GHz, 8 streams at 867 Mbps = 6.9 Gbps
802.11ax, 5 GHz and 2.4 GHz, 8 streams at 1201 Mbps = 9.6 Gbps
What’s the range of a long-ranged fixed wireless access point in a house?
40 to 50 meters
How can we connect two buildings that are located miles apart from each other?
Fixed directional antennas with increased signal strength. These help with point-to-point connections
What’s a benefit to networking outdoors as opposed to indoors?
There is minimal signal absorption or bounce
What’s one step you must do before setting up a long-range fixed wireless network?
Check with your country’s regulatory agency for rules and standards. You may have to apply for licenses to certain frequencies. The location and strength is also important for safety
What’s another wireless frequency that’s common in access badges and pet identification?
Radio-frequency identification (RFID). It’s a mostly one-way form of communication
