ZyXEL Communications P-334WT Technické informace stáhnout pdf (Strana 141)

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The Internet Management Model is as shown in figure 1. Interactions between the NMS and managed

devices can be any of four different types of commands:

1. Reads

Read is used to monitor the managed devices, NMSs read variables that are maintained by the

devices.

2. Writes

Write is used to control the managed devices, NMSs write variables that are stored in the

managed devices.

3. Traversal operations

NMSs use these operations to determine which variables a managed device supports and to

sequentially gather information from variable tables (such as IP routing table) in managed

devices.

4. Traps

The managed devices to asynchronously report certain events to NMSs use trap.

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