Sure. AAUI is standard ethernet, only an Apple-specific connector. That kind af adapter will get you up and running in seconds, for printing to a hub, getting online, etc.
Note that this one is listed as specifically designed for a 520c, which is, so far as I know, obviously not the case. There's a lot of differnet manufacturers for such adapters, and a lot of 68k and early PPC Macs with built-in AAUI etheret.