Today there are some standards on databases of the operating information. The cores are standards MIB-I and MIB-II and the version of a database for removed management RMONMIB. Still there are standards for special MIB devices of concrete type (for example, MIB for concentrators). Also is private MIB concrete firms-manufacturers of the equipment.

Initial specification MIB-I defined only operations of variables values reading. Operations of change or installation of values of object are a part of specifications MIB-II.

Version MIB-I (RFC 1156) defines up to 114 objects which are subdivided into 8 groups:

System - the general data about the device (for example, the identifier of the supplier, time of system last initialization).

Interfaces - parameters of network interfaces of the device (for example, their quantity, types, speeds of an exchange, the maximal size of a package) are described.

AddressTranslationTable - conformity between network and physical addresses (for example, under report ARP) is described. InternetProtocol - the data concerning protocol IP (addresses of IP-sluices, hosts, statistics about IP-packages).

• ICMP - the data concerning the protocol of an exchange by operating messages ICMP;
• TCP - the data concerning protocol TCP;
• UDP - the data concerning protocol UDP;
• EGP - the data concerning the protocol of an exchange by routing information ExteriorGatewayProtocol, used in network Internet.

From this list of variables groups it is visible, that standard MIB-I was developed with rigid orientation to management of the routers supporting reports of stack TCP/IP.

In version MIB-II (RFC 1213), accepted in 1992, was essentially (up to 185) the set of standard objects is expanded, and the number of groups has increased up to 10.

The newest addition to functionalities SNMP is specification RMON which provides the removed interaction with base MIB. Before occurrence RMON protocol SNMP could not be used by the removed image, it supposed only local management of devices. Base RMONMIB possesses the improved set of properties for the removed management. It contains the aggregated information on the device that does not demand transfer on a network of the information great volumes. Objects RMONMIB include:

• Counters of mistakes in packages;
• Flexible means of the graphic trends and statistics analysis;
• Powerful means of a filtration for capture and the analysis of separate packages;
• Complex conditions of an establishment of the prevention signals.

Agents RMONMIB are more intellectual in comparison with agents MIB-I or MIB-II. They perform a significant part of work on processing the information on the device which was carried out earlier by managers. These agents can settle down inside of various communication devices, and also to be executed in the form of the separate program modules working on universal personal computers and notebooks (an example can serve LANalyzerNovell).

To object RMON number 16 in a set of objects MIB is appropriated, and object RMON unites 10 groups of following objects:

• Statistics - the current saved up statistical data about characteristics of packages, quantity of collisions;
• History - the statistical data kept through certain time intervals for the subsequent analysis of change tendencies;
• Alarms - threshold values of statistics at which excess agent RMON sends the message to the manager;
• Host - data about hosts of a network, including about their MAC-addresses;
• HostTopN - the table of the most loaded hosts of a network;
• TrafficMatrix - statistics about intensity of the traffic between each pair hosts of the network, ordered in the form of a matrix;
• Filter - conditions of packages filtration;
• PacketCapture - conditions of packages capture;
• Event - conditions of registration and events generation.

That groups are numbered in that order. The tenth group is made with special objects of protocol Token Ring.

In total standard RMONMIB defines about 200 objects in 10 groups fixed in two documents - RFC 1271 for networks Ethernet and RFC 1513 for TokenRing networks.

Distinctive feature of standard RMONMIB is its independence of the network level protocol (unlike standards MIB-I and MIB-II, focused on protocols TCP/IP). Therefore, it is convenient for using in the heterogeneous environments using various protocols of a network level.