How do I force a Macbook in OSX to prefer 802.11a over 802.11g? I cannot shut off 802.11g on the WAP because it is used by other devices. Both use the same SSID which also cannot be changed.
Apple doesn't provide a way to force bands on the client. So the only way to do what you want is to give the 5GHz network a different network name (SSID) and only put that network name in your preferred networks list.
For best results, make sure the 2.4GHz network name is not in your preferred networks list; if you have to have both in your list, make sure the 5GHz network outranks the 2.4GHz network. However, 2.4GHz networks are much easier/quicker to find in scans than 5GHz networks are, so even if you rank 5GHz over 2.4GHz, if you have the 2.4GHz network in your list, there may be times when the 5GHz network gets missed but the 2.4GHz network gets found, so your machine joins the 2.4GHz network after all.
edit: reference to the comments.
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