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10.3.1 Basics of SNMP

10.3.1 Basics of SNMP
The Simple Network Management Protocol (SNMP) is a network management protocol.

SNMP is referred to as a query, command, or response protocol for testing and changing the configuration parameters of a LAN or WAN to which bridges, routers, switches, and other devices are connected.

The following versions are currently offered: SNMPv1, SNMPv2c, and SNMPv3. In contrast to SNMPv1 and SNMPv2c, SNMPv3 has added encryption and authentication functions.

The SNMP manager centrally manages the operation status and problem status of the terminals on a network. The SNMP agent returns management information called Management Information Base (MIB), in response to a manager request. The agent can also asynchronously notify the manager of given information, by using the function called Trap.
Figure 10-3 shows an example of a network management environment using SNMP.
Figure 10-3  Example of a Network Management Environment
Figure 10-3  Example of a Network Management Environment
Default Port Numbers Used by SNMP

The default port numbers used by SNMP are as follows.
  1. For the SNMP agent: Port 161
  2. For trap: Port 162