I've been having issues connecting to wifi access points, and I am wondering if the band is messing things up. How do I tell what band a wifi connection is using on the laptop if I don't have access to the router settings?
Option + Wifi Menu
Hold the Option key down and select your WiFi icon in the menu bar ( ⌥ + ).
Additional information in the menu includes “Channel:” and (5 GHz) or (2.4 GHz) for the current radio settings.
As seen in Yosemite:
You can get even more information from System Information. But I usually open the Wireless Diagnostics app (in Applications > Utilities folder). Choose