CompTIA Network+ Network+ Wireless Networking Standards 2 — Questions and Answers
Question 1: Which 802.11 amendment introduced Multi-User MIMO (MU-MIMO) allowing simultaneous transmission to multiple clients?
- 802.11n
- 802.11ac Wave 2 (Correct answer)
- 802.11g
- 802.11a
Correct answer: 802.11ac Wave 2
802.11ac Wave 2 introduced MU-MIMO, enabling an AP to transmit to multiple clients simultaneously rather than one at a time.
Question 2: What is the maximum number of spatial streams supported by 802.11ac?
- 2
- 4
- 8 (Correct answer)
- 16
Correct answer: 8
802.11ac supports up to 8 spatial streams, though most consumer devices implement 3 or 4.
Question 3: A technician needs to deploy Wi-Fi in a high-density stadium environment. Which 802.11ax (Wi-Fi 6) feature most directly addresses this need?
- OFDM
- OFDMA (Correct answer)
- DSSS
- FHSS
Correct answer: OFDMA
OFDMA (Orthogonal Frequency Division Multiple Access) in Wi-Fi 6 divides channels into sub-channels called Resource Units, allowing many clients to transmit simultaneously.
Question 4: Which wireless standard operates exclusively in the 60 GHz band and is designed for short-range, high-bandwidth applications?
- 802.11ac
- 802.11ax
- 802.11ad (Correct answer)
- 802.11n
Correct answer: 802.11ad
802.11ad (WiGig) operates in the 60 GHz band, offering multi-gigabit speeds over very short distances (typically within a room).
Question 5: What modulation scheme does 802.11ax (Wi-Fi 6) support that 802.11ac does not?
- 64-QAM
- 256-QAM
- 512-QAM
- 1024-QAM (Correct answer)
Correct answer: 1024-QAM
Wi-Fi 6 (802.11ax) introduces 1024-QAM, allowing more bits per symbol and higher throughput compared to 802.11ac's maximum of 256-QAM.
Question 6: A wireless network shows clients connecting at 54 Mbps on the 2.4 GHz band. Which standard is most likely in use?
- 802.11b
- 802.11g (Correct answer)
- 802.11n
- 802.11a
Correct answer: 802.11g
802.11g operates in the 2.4 GHz band with a maximum data rate of 54 Mbps, matching this scenario.
Question 7: Which Wi-Fi generation introduced Target Wake Time (TWT) to improve battery life for IoT devices?
- Wi-Fi 4 (802.11n)
- Wi-Fi 5 (802.11ac)
- Wi-Fi 6 (802.11ax) (Correct answer)
- Wi-Fi 6E (802.11ax extended)
Correct answer: Wi-Fi 6 (802.11ax)
Wi-Fi 6 (802.11ax) introduced Target Wake Time, allowing devices to schedule when they wake to send/receive data, significantly improving IoT device battery life.
CompTIA Network+ Network+ Wireless Networking Standards 2
Which 802.11 amendment introduced Multi-User MIMO (MU-MIMO) allowing simultaneous transmission to multiple clients?