Fig. 1-1 NMS and Agent relationship
MIB
（
Management Information Base
）
Is a virtual network management information base.Managed
network device contains a large amount of information,in order to be able to in the SNMP message
uniquely identifies a particular management unit,MIB with tree like hierarchical structure to describe
the management unit in the network equipment.The tree node represents a specific management
unit.The diagram below MIB object named tree,For a management unit System uniquely identifies the
network equipment in the,A list of Numbers can be used to represent such as {1.3.6.1.2.1.1},this string
of Numbers is the management unit of the Object Identifier,MIB is a collection of network equipment
unit identifier.
Figure 1-2 MIB tree hierarchy
10.1.2. SNMP Protocol Version
The SNMP version supports the following:
SNMPv1
：
The first official version of the simple network management protocol, defined in RFC1157.
SNMPv2C
：
SNMPv2 management structure of Community-Based, defined in RFC1901 an
experimental protocol.
SNMPv1 and SNMPv2C are the security architecture of Community-based.By the definition of the
host address and authentication name (CommunityString) is defined to proxy MIB operation manager.
