Understanding the network.pdf - Back to Home

eports on network utilization, availability, and inventory. Most NMCs also perform
automatic device discovery and topology mapping. Figure 11.1 illustrates the basic
NMS relationship structure.
Figure 11.1. The basic NMS architecture model.
OSI Network Management Model
The International Standards Organization (ISO) developed an Open System
Interconnection (OSI) network management model to provide a common reference
for understanding and developing network management protocols and systems.
The model defines five functional management areas:
• Fault management—This is the function of detecting, isolating, logging, and
resolving network conditions that prevent the network from operating in a
normal condition. Fault management elements would involve the detection
and notification of abnormal conditions through the use of device queries
using availability and performance thresholds to determine ranges of normal
and abnormal operation. After a problem is identified, it is entered into a
trouble ticketing system. The trouble ticketing system provides problem
documentation, status reporting, and resolution documentation.