Simple Network Management Protocol （SNMP） is an Internet Standard protocol for collecting and organizing information about managed devices on IP networks and for modifying that information to change device（/）. SNMP is a component of the Internet Protocol Suite
as defined by the Internet（/）Task Force. SNMP operates in the（/）layer of the Internet protocol suite. All SNMP messages are transported via User（ ）Protocol. An SNMP-managed network consists of three key components: a） Managed devices，b） （/）u2003
（i.e.，software which runs on managed devices），and c） Network management station （NMS） （i.e.， software which runs on the manager）.