Wi-Fi standards (802.11 a/b/g/n/ac/ax) in Computer Networks - Practice Problems & Coding Challenges

Challenge - 5 Problems

📋 Factual

intermediate

Maximum Theoretical Speed of 802.11ac

What is the maximum theoretical data transfer speed of the 802.11ac Wi-Fi standard under ideal conditions?

A 54 Mbps

B 600 Mbps

C 1.3 Gbps

D 9.6 Gbps

💡 Hint

Think about the generation after 802.11n and before 802.11ax.

802.11ac supports speeds up to 1.3 Gbps by using wider channels and multiple antennas.

🧠 Conceptual

intermediate

Frequency Bands Used by 802.11b and 802.11a

Which frequency bands do the 802.11b and 802.11a Wi-Fi standards primarily use?

A 802.11b uses 2.4 GHz; 802.11a uses 5 GHz

B 802.11b uses 5 GHz; 802.11a uses 2.4 GHz

C Both use 2.4 GHz

D Both use 5 GHz

💡 Hint

One is older and uses the more crowded band.

802.11b operates on the 2.4 GHz band, which is more crowded, while 802.11a uses the less crowded 5 GHz band.

🔍 Analysis

advanced

Comparing Range and Speed of 802.11n and 802.11ax

Which statement correctly compares the range and speed improvements of 802.11ax over 802.11n?

A 802.11ax offers higher speed and better range than 802.11n by using OFDMA and improved modulation.

B 802.11ax has lower speed but better range than 802.11n due to narrower channels.

C 802.11ax and 802.11n have the same speed but 802.11ax uses a different frequency band.

D 802.11ax offers higher speed but shorter range than 802.11n because it only uses 5 GHz.

💡 Hint

Consider new technologies introduced in 802.11ax.

802.11ax improves both speed and range by using technologies like OFDMA and better modulation schemes compared to 802.11n.

❓ Reasoning

advanced

Why 802.11g is Backward Compatible with 802.11b

Why is the 802.11g Wi-Fi standard backward compatible with 802.11b devices?

A Because 802.11g uses the 5 GHz band but can switch to 2.4 GHz for compatibility.

B Because 802.11g uses a completely different frequency and protocol but can emulate 802.11b signals.

C Because 802.11g devices include two separate radios for 2.4 GHz and 5 GHz bands.

D Because both operate on the 2.4 GHz band and 802.11g supports the same modulation as 802.11b.

💡 Hint

Think about frequency and modulation compatibility.

802.11g operates on the 2.4 GHz band and supports the same modulation techniques as 802.11b, allowing devices to communicate.

❓ Comparison

expert

Identifying the Wi-Fi Standard from Features

Which Wi-Fi standard introduced multi-user MIMO (MU-MIMO) technology to improve simultaneous device connections?

A 802.11n

B 802.11ac

C 802.11ax

D 802.11g

💡 Hint

It came after 802.11n and before 802.11ax.

802.11ac introduced MU-MIMO, allowing multiple devices to communicate simultaneously, improving network efficiency.