A major disadvantage of IEEE 802.11n is that it is not upward compatible with 802.11a or 802.11b.

Name: A major disadvantage of IEEE 802.11n is that it is not upward compatible with 802.11a or 802.11b.
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IEEE 802.11n is backward compatible with both 802.11a and 802.11b, meaning it can communicate with devices using those protocols. However, older devices using 802.11a or 802.11b may not be able to take advantage of the faster speeds offered by 802.11n.

A Major Disadvantage of IEEE 802