802.11 Standards and Technologies

802.11a

5Ghz at 54Mbps

802.11b

2.4Ghz at 11Mbps

802.11g

2.4Ghz at 54Mbps

802.11b

what standard is 802.11g backwards compatible with?

802.11n

2.4Ghz and 5Ghz at 72Mbps or 600Mbps bonded

HT Mode

What feature of 802.11 ensures compatibility with older standards but lowers overall WLAN performance?

802.11a, 802.11b, 802.11g

802.11n is backwards compatible with?

1, 6, 11

What channels in 2.4GHz don’t overlap?

802.11ac

5GHz at 1 Gbps and up, introduced MU-MIMO

802.11ax

2.4Ghz, 5Ghz, and 6Ghz at up to 10 Gbps

802.11n

Which standard introduced MIMO and Channel Bonding?

CSMA/CA

used by Wi-Fi to cope with contention over shared media

CSMA/CD

used by wired networks to cope with contention over shared media

MIMO

enables use of multiple rx and tx antennae to boost bandwidth and range

MIMO-MU

enables use of multiple rx and tx antennae to support multiple client connects simultaneously, replacing CSMA/CA in Wi-Fi 5 and Wi-Fi 6

Channel Bonding

enables aggregating adjacent wireless channels to increase bandwidth

Band Steering

attempts to connect clients to a certain frequency band, instead of client devices deciding

802.11h

adds Dynamic Frequency Section (selects channels not in use by radar and satellite) and Transmit Power Control (control broadcast power of client)

Co-Channel Interference

interference caused by devices configured to the same wireless channel

Collision Domain

Devices within the same channel are in the same______

Adjacent Channel Interference

interference caused by devices configured to overlapping wireless channels

Wi-Fi Analyzer

analyzes Wii-Fi signals to report WLAN characteristics, like signal strength, attenuation, channel utilization.

Spectrum Analyzer

lets you see every signal type to detect sources of interference

Narrowband-IoT

greater penetrating power than regular cellular

LTE-M

lower power draw than regular cellular

QoS

prioritizes types of traffic to ensure performance on critical applications and services like voice and video.

Traffic Shaper

optimizes throughput to get the most from available bandwidth by delaying certain packet types

Throughput

Rate of actual data transfer at network layer

Goodput

Rate of useful data delivered. No headers or lower protocols, only application data