Wi-Fi standards (802.11 a/b/g/n/ac/ax) in Computer Networks - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the 802.11a Wi-Fi standard primarily use for communication?

802.11a uses the 5 GHz frequency band, which helps reduce interference and offers faster speeds compared to 2.4 GHz bands.

intermediate

Which Wi-Fi standard introduced the use of Multiple Input Multiple Output (MIMO) technology?

802.11n introduced MIMO technology, allowing multiple antennas to send and receive data simultaneously, improving speed and range.

intermediate

What is the main advantage of 802.11ac over previous Wi-Fi standards?

802.11ac operates mainly on the 5 GHz band and supports wider channels and more spatial streams, resulting in much higher data speeds.

advanced

How does 802.11ax (Wi-Fi 6) improve network performance in crowded areas?

802.11ax uses technologies like OFDMA and improved MU-MIMO to allow many devices to communicate efficiently at the same time, reducing congestion.

beginner

Which Wi-Fi standard is known for operating on the 2.4 GHz band with a maximum speed of 11 Mbps?

802.11b operates on the 2.4 GHz band and supports speeds up to 11 Mbps, making it one of the earliest widely used Wi-Fi standards.

Which Wi-Fi standard first introduced the 5 GHz frequency band?

A 802.11b

B 802.11a

C 802.11g

D 802.11n

802.11a was the first to use the 5 GHz band, offering less interference and higher speeds than 2.4 GHz.

What technology does 802.11n use to improve speed and range?

A MIMO

B OFDMA

C Beamforming

D WPA3

802.11n introduced MIMO, which uses multiple antennas to send and receive data simultaneously.

Which Wi-Fi standard is also called Wi-Fi 6?

A 802.11ac

B 802.11b

C 802.11g

D 802.11ax

802.11ax is known as Wi-Fi 6 and focuses on efficiency and performance in crowded networks.

What is the maximum speed of 802.11b?

A 54 Mbps

B 600 Mbps

C 11 Mbps

D 1 Gbps

802.11b supports speeds up to 11 Mbps on the 2.4 GHz band.

Which feature helps 802.11ax handle many devices at once?

A OFDMA

B Single-user MIMO

C 802.11b compatibility

D 2.4 GHz band only

OFDMA allows 802.11ax to divide channels to serve multiple devices efficiently.

Explain the main differences between 802.11b, 802.11g, and 802.11n Wi-Fi standards.

Think about speed improvements and technology changes over time.

Describe how 802.11ax (Wi-Fi 6) improves Wi-Fi performance in busy places like airports or stadiums.

Focus on how it manages many users at once.