220-801 · Question #721
Which of the following networking standards can operate at two different channel widths on the same spectrum simultaneously?
The correct answer is D. 802.11n. 802.11n introduced the ability to bond two 20 MHz channels into a single 40 MHz channel, allowing it to operate at both 20 MHz and 40 MHz widths on the same 2.4 GHz or 5 GHz spectrum.
Question
Which of the following networking standards can operate at two different channel widths on the same spectrum simultaneously?
Options
- A802.11a
- B802.11b
- C802.11g
- D802.11n
How the community answered
(36 responses)- A3% (1)
- B3% (1)
- D94% (34)
Why each option
802.11n introduced the ability to bond two 20 MHz channels into a single 40 MHz channel, allowing it to operate at both 20 MHz and 40 MHz widths on the same 2.4 GHz or 5 GHz spectrum.
802.11a operates exclusively in the 5 GHz band using 20 MHz channels only and does not support variable channel widths.
802.11b operates exclusively in the 2.4 GHz band at a fixed 22 MHz channel width with no channel bonding capability.
802.11g operates in the 2.4 GHz band using a fixed 20 MHz channel width and does not support the 40 MHz bonded channel mode.
802.11n introduced channel bonding, which doubles channel width from 20 MHz to 40 MHz to increase throughput. It can operate at either width simultaneously on the same frequency band, allowing backward compatibility with 20 MHz devices while offering 40 MHz performance to capable devices. This dual-width capability is unique to 802.11n among the options listed.
Concept tested: 802.11n dual channel width bonding capability
Source: https://www.comptia.org/training/resources/exam-objectives
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