CompTIA Network+ Network+ Wireless Networking Standards 3

Question 1

Which 802.11 standard was the first to support both 2.4 GHz and 5 GHz bands simultaneously?

Accepted Answer

802.11n

Answer

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?

Accepted Answer

The client connects at 802.11n speeds

Answer

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?

Accepted Answer

80 MHz and 160 MHz

Answer

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?

Accepted Answer

FHSS

Answer

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?

Accepted Answer

802.11b

Answer

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.

CompTIA Practice Test