What is RMON?

今天被头问到关于 RMON 的问题，回答不出来，汗～
赶紧 google 一下，下面是摘录的一点资料：

Short for remote monitoring, a network management protocol that allows network information to be gathered at a single workstation. Whereas SNMP gathers network data from a single type of Management Information Base (MIB), RMON 1 defines nine additional MIBs that provide a much richer set of data about network usage. For RMON to work, network devices, such as hubs and switches, must be designed to support it.

下面还有一个更全面的：
http://www.javvin.com/protocolRMON.html