220-801 · Question #539
Which of the following wireless standards is backwards compatible with 802.11g?
The correct answer is C. 802.11n. 802.11n is backwards compatible with 802.11g because both standards operate on the 2.4 GHz band, allowing 802.11n access points to communicate with older 802.11g clients.
Question
Which of the following wireless standards is backwards compatible with 802.11g?
Options
- A802.11a
- B802.11b
- C802.11n
- D802.1q
How the community answered
(51 responses)- A2% (1)
- B4% (2)
- C88% (45)
- D6% (3)
Why each option
802.11n is backwards compatible with 802.11g because both standards operate on the 2.4 GHz band, allowing 802.11n access points to communicate with older 802.11g clients.
802.11a operates exclusively on the 5 GHz band while 802.11g operates on 2.4 GHz, making them physically incompatible due to different radio frequencies.
802.11b is an older standard (11 Mbps) that preceded 802.11g (54 Mbps), so it is not backwards compatible with g - g devices can connect to b networks but b is not a superset of g.
IEEE 802.11n operates on both the 2.4 GHz and 5 GHz bands and was designed to be backwards compatible with 802.11g (2.4 GHz, 54 Mbps) and 802.11b (2.4 GHz, 11 Mbps) devices. When an 802.11n AP detects a legacy client, it negotiates down to the supported rate on the same 2.4 GHz frequency.
802.1q is not a wireless standard at all - it is the IEEE standard for VLAN tagging on wired Ethernet trunk links.
Concept tested: 802.11 wireless standard backwards compatibility
Source: https://standards.ieee.org/ieee/802.11n/4096/
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