Network+ Wireless Networking Standards Flashcards

An 802.11n network uses channel bonding on the 2.4 GHz band. What problem does this commonly cause?

Answer: Increased co-channel interference due to limited non-overlapping channels

The 2.4 GHz band has only 3 non-overlapping 20 MHz channels; bonding to 40 MHz leaves almost no room for neighbors without interference.

What is the theoretical maximum throughput of 802.11g?

Answer: 54 Mbps

802.11g has a maximum PHY rate of 54 Mbps, using OFDM modulation in the 2.4 GHz band.

Which amendment to 802.11 defined Quality of Service (QoS) mechanisms for wireless networks, prioritizing voice and video traffic?

Answer: 802.11e

802.11e introduced WMM (Wi-Fi Multimedia), defining QoS categories to prioritize voice, video, best effort, and background traffic.

A user complains of slow Wi-Fi when using a 2.4 GHz microwave oven nearby. Which wireless standard would be LEAST affected by this interference?

Answer: 802.11a

802.11a operates exclusively in the 5 GHz band, which is not affected by 2.4 GHz microwave oven interference.

BSS Coloring is a feature introduced in which Wi-Fi generation to reduce co-channel interference in dense deployments?

Answer: Wi-Fi 6 (802.11ax)

Wi-Fi 6 (802.11ax) introduced BSS Coloring, which tags frames with a color bit so devices can ignore transmissions from overlapping networks and transmit simultaneously.

What is the primary purpose of the 802.11r amendment?

Answer: Fast BSS Transition (fast roaming) between APs

802.11r defines Fast BSS Transition, reducing roaming handoff time between APs to support real-time applications like VoIP.

Which wireless standard supports a maximum PHY rate of 11 Mbps using DSSS in the 2.4 GHz band?

Answer: 802.11b

802.11b uses Direct Sequence Spread Spectrum (DSSS) in the 2.4 GHz band with a maximum data rate of 11 Mbps.