Exam 220-1101 topic 1 question 92 discussion

I remember these by 802.11a = legacy = 5GHz b & g = boy and girl on 2.4ghz. Boys drool, girls rule. Girls are faster than boys - go with highest n = plays nice and plays with both 2.4 and 5 ghz. ax = axe - splits wood into 2, splits into 2.4 and 5 ac = wifi5, 5 ghz, but backwards compatible (only option left since n and ax are not options…) n is not an option so must be ac.

I believe its an Error/typo. NONE OF THE ANSWER ARE CORRECT. 802.11ax Should be the answer or 802.11n

802.11a only supports 5 GHz b and g only support 2.4 GHz ac supports 5 GHz, but is backwards compatible with 2.4 GHz

B. 802.11ac 802.11ac is the standard that supports both 5GHz and 2.4GHz channel frequencies. It provides higher data rates and improved performance compared to earlier standards. While 802.11ac primarily operates in the 5GHz band, it is backward compatible with 802.11n and supports the 2.4GHz band for compatibility with devices that use that frequency. according to ChatGpt

Only 802.11n & 802.11ax use 2.4GHz and 5GHz. Rest of those use either 2.4GHz or 5GHz

E. 802.11ax

No correct answer there

Wi-Fi 5 (802.11ac) Wi-Fi 5 is designed to work only in the 5 GHz band. A dual band access point can use its 2.4 GHz radio to support clients on legacy standards (802.11g/n) Wi-Fi 6 (802.11ax) Wi-Fi 6 works in both the 2.4 GHz and 5 GHz bands. From Comptia A+ Guide

This is incorrect because 802.11ac only support 5GHz

No option is correct. you should edit this question or repons

No option is correct here. Only 802.11n and 802.11ax supports both 2.4GHz and 5GHz band

this is incorrect... if a consumer electronic states this, what is actually happening is they are relying on the 802.11n standard for their 2.4Ghz band

Dual band antennas are available for 802.11ac

Via CompTIA's book: A - "The IEEE 802.11a standard uses the 5 GHz frequency band only" B - "Wi-Fi 5 [802.11ac] is designed to work only in the 5 GHz band. A dual band access point can use its 2.4 GHz radio to support clients on legacy standards (802.11g/n). A tri band access point has one 2.4 GHz radio and two 5 GHz radios. Wi-Fi 5 allows up eight streams, though in practice, most Wi-Fi 5 access points only support 4x4 streams. A single stream over an 80 MHz channel has a nominal rate of 433 Mbps." C - "The IEEE 802.11b standard uses the 2.4 GHz frequency band" D - "The IEEE 802.11g standard offered a relatively straightforward upgrade path from 802.11b; uses the same encoding mechanism and 54 Mbps rate as 802.11a but in the 2.4 GHz band used by 802.11b and with the same channel layout. This made it straightforward for vendors to design 802.11g devices that could offer backwards support for legacy 802.11b clients."

it's b 802.11ac

@Digital 1785 I agree. None of these options here are correct. The only 802.11 standards that support both 2.4 and 5GHz frequencies are 802.11 n, and the newest standard 802.11 ax

802.11ac (Wi-Fi 5) The generation of Wi-Fi that first signaled popular use, 802.11ac uses dual-band wireless technology, supporting simultaneous connections on both 2.4 GHz and 5 GHz Wi-Fi devices https://www.lifewire.com/wireless-standards-802-11a-802-11b-g-n-and-802-11ac-816553#:~:text=absolutely%20no%20interference.-,802.11ac%20(Wi%2DFi%205),5%20GHz%20Wi%2DFi%20devices.