This site provides functions for creating your own flashcards of varying types. This particular link looks for those tagged as being suitable for study for the CISSP exam. (You will notice that there are other related tags, and you may wish to try out those for security terms which are not specific to the CISSP.)
The material is provided by volunteers, so the quality varies. In the sets I examined, some points were flatly wrong, while others where questionable. However, it does provide a range of points to test yourself against, and see if you are unfamiliar with certain areas.
(The functions of the card decks also vary: some are simply vocabulary flashcards, while others present sample questions for you to test yourself.)