*At most, messages of this level may be lost or duplicated, and message postings depend on the underlying TCP / IP network. That is: <= 1

*At most, messages of this level may be lost or duplicated, and message postings depend on the underlying TCP / IP network. That is: <= 1

*At one time, this level will ensure that the message arrives, but the message may be repeated. That is:> = 1

*At one time, this level will ensure that the message arrives, but the message may be repeated. That is:> = 1