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Pulling Management Data from a Device

Figure 1 illustrates a simple example of drawing data from a managed entity—in this case, my desktop PC.

Figure 1

Figure 1 Network interface and route table details

In Figure 1, I list the network adapters on my PC. There are two, as follows:

  • A 100Mbps Ethernet adapter
  • A loopback adapter

The loopback adapter isn’t really a hardware entity; it just represents the IP loopback address The other major data item in Figure 1 is the IP route table on my desktop. This is a table that is created automatically by the IP protocol (or more precisely, the TCP/IP protocol stack).

Entities that can be managed are said to be "instrumented," which just means that they contain additional software. The latter is used to handle the management data infrastructure and the facilities to interact with it.

In the case of my wireless broadband router, the instrumentation is the web server as well as the underlying software that handles management operations.

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