CompTIA Network+ Network+ Wireless Networking Standards 3 — Questions and Answers
Question 1: Which 802.11 standard was the first to support both 2.4 GHz and 5 GHz bands simultaneously?
- 802.11a
- 802.11g
- 802.11n (Correct answer)
- 802.11ac
Correct answer: 802.11n
802.11n was the first dual-band standard, capable of operating on both 2.4 GHz and 5 GHz bands.
Question 2: A company deploys 802.11ac APs. A client device only supports 802.11n. What will happen when that client associates?
- The client cannot connect
- The client connects at 802.11n speeds (Correct answer)
- The AP upgrades the client firmware
- The client connects only if WPA3 is disabled
Correct answer: The client connects at 802.11n speeds
802.11ac is backward compatible with 802.11n; the client will associate and communicate at the highest speed both devices support (802.11n rates).
Question 3: What is the channel width used by 802.11ac that enables it to achieve throughput exceeding 1 Gbps?
- 20 MHz
- 40 MHz
- 80 MHz and 160 MHz (Correct answer)
- 60 MHz
Correct answer: 80 MHz and 160 MHz
802.11ac supports 80 MHz and optional 160 MHz channel widths, which are key to achieving multi-gigabit theoretical throughput.
Question 4: Which wireless technology uses frequency hopping across the 2.4 GHz ISM band and is associated with early Bluetooth versions?
- DSSS
- OFDM
- FHSS (Correct answer)
- MIMO
Correct answer: FHSS
Frequency Hopping Spread Spectrum (FHSS) rapidly switches frequencies across the band; early 802.11 and Bluetooth both used this technique.
Question 5: A wireless survey reveals a network using 22 MHz-wide channels on 2.4 GHz. Which standard is this?
- 802.11a
- 802.11b (Correct answer)
- 802.11g
- 802.11n
Correct answer: 802.11b
802.11b uses 22 MHz-wide channels in the 2.4 GHz band, which is why only 3 non-overlapping channels exist on 2.4 GHz.
Question 6: Wi-Fi 6E differs from Wi-Fi 6 primarily because it adds support for which frequency band?
- 900 MHz
- 3.6 GHz
- 6 GHz (Correct answer)
- 10 GHz
Correct answer: 6 GHz
Wi-Fi 6E extends 802.11ax into the 6 GHz band, providing up to 1,200 MHz of additional spectrum largely free of legacy device interference.
Question 7: Which 802.11 feature allows an access point to form a wireless backhaul with other APs to extend network coverage without wired uplinks?
- WDS (Wireless Distribution System) (Correct answer)
- BSS (Basic Service Set)
- ESS (Extended Service Set)
- IBSS (Independent Basic Service Set)
Correct answer: WDS (Wireless Distribution System)
WDS allows APs to bridge wirelessly to each other, enabling mesh-like coverage extension without needing Ethernet runs to every AP.
CompTIA Network+ Network+ Wireless Networking Standards 3
Which 802.11 standard was the first to support both 2.4 GHz and 5 GHz bands simultaneously?