Gets/Sets Enumeration to specify how the Client cache is synchronized with the cluster caches through events.
public enum ClientCacheSyncMode
It is possible that client caches are not synchronized with clustered cache for a small period of time. If during this time users gets an item from the client cache, he may get an old version. This is the "Optimistic" mode of synchronization
In "Pessimistic" mode of synchronization, client cache always checks for the "version" of the cached item before returning it to the application.