If another species is advanced enough to travel between stars, it is entirely likely that they will have technologies which we have not currently conceived of . . .
What leads you to state that it is entirely likely? Speculation?
A review of human history. At every point of our development we have discovered technologies which we previously couldn't conceive of, brand new ideas which spawn legions of sub-ideas and products. It is entirely likely that this trend will continue, based on available evidence. Therefore it is likely that species which would be MORE technologically advanced than we are, have experienced similar development.
When discussing alien encounters, a certain amount of speculation is downright necessary
. Limiting our conceptions to the 'star trek' model, of aliens being basically like us with the capabilities and emotions we have, will lead to very limited and Homo Sapien-centric results.