Can you explain how clustering works within Lotus Notes?

It would help if you had a pretty good idea of the interviewer's technical expertise when answering this question. This may be based on their job title, the nature of their questions, or the feedback you receive from them during the interview. Always frame your answer to the appropriate level of expertise of the interviewer. Oversimplifying an answer is just as bad as overcomplicating one.

"Within the context of Lotus Notes, clustering refers to two or more servers providing the users with constant access. This creates a more reliable and available Lotus notes environment. Servers within a Lotus Domino cluster continually communicate with each other, so they are all updated on the status of the other servers and keep the replicas of the database synchronized."