Does ConcurrentHashMap Iterator behaves like fail fast iterator or fail safe Iterator?

ConcurrentHashMap iterator behaves like fail safe iterator. It will not throw ConcurrentModificationException. 

Difference between Fail fast and fail safe iterator  or  Fail fast vs Fail Safe iterator is one of those questions which are  used to test your knowledge about the topic Concurrency.
Before we discuss in detail about fail safe iterator and fail fast iterator in addition to  their comparison , we should understand the term Concurrent Modification .