8. SNMP Management: RMON
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چکیده
We saw examples of SNMP messages going across the network between a manager and an agent in Section 5.1.4. We did this using a tool that “sniffs” every packet that is going across a local area network (LAN), opens it, and analyzes it. It is a passive operation and does nothing to the packets, which continue to proceed to their destinations. This is called monitoring or probing the network and the device that does the function is called the network monitor or the probe. Let us distinguish between the two components of a probe: (1) physical object that is connected to the transmission medium and (2) processor, which analyzes the data. If both are at the same place geographically, it is a local probe, which is how sniffers used to function. We will discuss this further in Chapter 9, when we consider management systems and tools.
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