Network monitoring

This portion of network monitoring is concerned with observing and analyzing the status and behavior of the end system, intermediate systems and sub networks that make up the configuration to be managed.

Major design areas of network monitoring:
1. Access to monitored informations.
2. Design of monitoring mechanism.
3. Application of monitored information

Network monitoring Architecture - Informations:
The information that should be available for network monitoring can be classified as
- Static
- Dynamic
- Statistical

Static information characterizes the current configuration and the elements in the current configuration such as number and identification of ports on a router. This information will change only infrequently.
Dynamic information is related to events in the network, such as a change of state of a protocol machine or the transmission of a packet on a network.
Statistical information may be derived from dynamic information, such as the average number of packets transmitted per unit time by an end system.

Collection and storing of monitored information:
Static information is typically generated by the element involved.
- Dynamic information is generated, collected and stored by the network element responsible for the underlying events or by the remote monitor.
- Statistical information can be generated by any system that has access to underlying synamic information.